Rebuild

Bump ruby/setup-ruby
Bumps the actions-minor group with 1 update in the /.github/workflows directory: [ruby/setup-ruby](https://github.com/ruby/setup-ruby). Updates `ruby/setup-ruby` from 1.306.0 to 1.307.0 - [Release notes](https://github.com/ruby/setup-ruby/releases) - [Changelog](https://github.com/ruby/setup-ruby/blob/master/release.rb) - [Commits](https://github.com/ruby/setup-ruby/compare/c4e5b1316158f92e3d49443a9d58b31d25ac0f8f...6aaa311d81eba98ae12eaffbcb63296ace0efcde) --- updated-dependencies: - dependency-name: ruby/setup-ruby dependency-version: 1.307.0 dependency-type: direct:production update-type: version-update:semver-minor dependency-group: actions-minor ... Signed-off-by: dependabot[bot] <support@github.com>
2026-05-24 16:14:33 +00:00 · 2026-05-20 22:08:52 +00:00 · 2026-05-20 22:06:56 +00:00 · 2026-05-20 16:26:50 +00:00 · 2026-05-20 16:39:16 +01:00 · 2026-05-20 14:31:25 +00:00
125 changed files with 73355 additions and 1464120 deletions
@@ -16,5 +16,5 @@ inputs:
      Comma separated list of query ids that should NOT be included in this SARIF file.

 runs:
-  using: node20
+  using: node24
  main: index.js
@@ -41,7 +41,38 @@ runs:
        git add .
        git commit -m "Update changelog and version after ${VERSION}"

-        git push origin "${NEW_BRANCH}"
+    # Update the build artifacts with the new version number
+    - name: Rebuild the Action
+      shell: bash
+      run: |
+        set -exu
+        npm ci
+        npm run build
+
+    - name: Check for rebuild changes
+      id: rebuild_changes
+      shell: bash
+      run: |
+        set -exu
+        git add --all
+        if git diff --cached --quiet; then
+          echo "has_changes=false" >> "${GITHUB_OUTPUT}"
+        else
+          echo "has_changes=true" >> "${GITHUB_OUTPUT}"
+        fi
+
+    - name: Commit rebuild
+      if: steps.rebuild_changes.outputs.has_changes == 'true'
+      shell: bash
+      run: |
+        set -exu
+        git commit -m "Rebuild"
+
+    - name: Push mergeback branch
+      shell: bash
+      env:
+        NEW_BRANCH: "${{ inputs.branch }}"
+      run: git push origin "${NEW_BRANCH}"

    - name: Create PR
      shell: bash
@@ -60,8 +91,6 @@ runs:

          Please do the following:

-          - [ ] Remove and re-add the "Rebuild" label to the PR to trigger just this workflow.
-          - [ ] Wait for the "Rebuild" workflow to push a commit updating the distribution files.
          - [ ] Mark the PR as ready for review to trigger the full set of PR checks.
          - [ ] Approve and merge the PR. When merging the PR, make sure "Create a merge commit" is
                selected rather than "Squash and merge" or "Rebase and merge".
@@ -74,7 +103,6 @@ runs:
          --head "${NEW_BRANCH}" \
          --base "${BASE_BRANCH}" \
          --title "${pr_title}" \
-          --label "Rebuild" \
          --body "${pr_body}" \
          --assignee "${GITHUB_ACTOR}" \
          --draft
@@ -18,7 +18,7 @@ runs:
    - name: Set up Node
      uses: actions/setup-node@v6
      with:
-        node-version: 20
+        node-version: 24
        cache: 'npm'

    - name: Set up Python
@@ -1,6 +1,6 @@
 name: Verify that the best-effort debug artifact scan completed
 description: Verifies that the best-effort debug artifact scan completed successfully during tests
 runs:
-  using: node20
+  using: node24
  main: index.js
  post: post.js
@@ -16,12 +16,27 @@ No user facing changes.
 """

 # NB: This exact commit message is used to find commits for reverting during backports.
-# Changing it requires a transition period where both old and new versions are supported.
+# Changing it requires a transition period where both old and new versions are supported.
 BACKPORT_COMMIT_MESSAGE = 'Update version and changelog for v'

+# Commit message used for rebuild commits, both those produced by this script and those produced
+# by the `Rebuild Action` workflow (`.github/workflows/rebuild.yml`).
+REBUILD_COMMIT_MESSAGE = 'Rebuild'
+
 # Name of the remote
 ORIGIN = 'origin'

+# Environment variables to check for a GitHub API token.
+TOKEN_ENVIRONMENT_VARIABLES = ('GH_TOKEN', 'GITHUB_TOKEN')
+
+# Gets a GitHub API token from one of the supported environment variables.
+def get_github_token():
+  for variable_name in TOKEN_ENVIRONMENT_VARIABLES:
+    token = os.environ.get(variable_name, '').strip()
+    if token:
+      return token
+  raise Exception('Missing GitHub token. Set GITHUB_TOKEN or GH_TOKEN.')
+
 # Runs git with the given args and returns the stdout.
 # Raises an error if git does not exit successfully (unless passed
 # allow_non_zero_exit_code=True).
@@ -32,6 +47,28 @@ def run_git(*args, allow_non_zero_exit_code=False):
    raise Exception(f'Call to {" ".join(cmd)} exited with code {p.returncode} stderr: {p.stderr.decode("ascii")}.')
  return p.stdout.decode('ascii')

+# Runs the given command, streaming output to the console.
+# Raises an error if the command does not exit successfully.
+def run_command(*args):
+  cmd = list(args)
+  print(f'Running `{" ".join(cmd)}`.')
+  subprocess.run(cmd, check=True)
+
+# Rebuilds the action and commits any changes.
+def rebuild_action():
+  # For backports, the only source-level change vs the source branch is the new version number,
+  # so we just need to refresh the version embedded in `lib/`.
+  run_command('npm', 'ci')
+  run_command('npm', 'run', 'build')
+
+  run_git('add', '--all')
+  # `git diff --cached --quiet` exits 0 if there are no staged changes, 1 if there are.
+  if subprocess.run(['git', 'diff', '--cached', '--quiet']).returncode == 0:
+    print('Rebuild produced no changes; skipping Rebuild commit.')
+  else:
+    run_git('commit', '-m', REBUILD_COMMIT_MESSAGE)
+    print('Created Rebuild commit.')
+
 # Returns true if the given branch exists on the origin remote
 def branch_exists_on_remote(branch_name):
  return run_git('ls-remote', '--heads', ORIGIN, branch_name).strip() != ''
@@ -87,9 +124,11 @@ def open_pr(
  body.append('Please do the following:')
  if len(conflicted_files) > 0:
    body.append(' - [ ] Ensure `package.json` file contains the correct version.')
-    body.append(' - [ ] Add commits to this branch to resolve the merge conflicts ' +
+    body.append(' - [ ] Add a commit to this branch to resolve the merge conflicts ' +
      'in the following files:')
-    body.extend([f'    - [ ] `{file}`' for file in conflicted_files])
+    body.extend([f'    - `{file}`' for file in conflicted_files])
+    body.append(' - [ ] Rebuild the Action locally (`npm run build`) and push any changes to the ' +
+      f'built output in `lib` as a separate commit named exactly `{REBUILD_COMMIT_MESSAGE}`.')
    body.append(' - [ ] Ensure another maintainer has reviewed the additional commits you added to this ' +
      'branch to resolve the merge conflicts.')
  body.append(' - [ ] Ensure the CHANGELOG displays the correct version and date.')
@@ -97,10 +136,6 @@ def open_pr(
  body.append(f' - [ ] Check that there are not any unexpected commits being merged into the `{target_branch}` branch.')
  body.append(' - [ ] Ensure the docs team is aware of any documentation changes that need to be released.')

-  if not is_primary_release:
-    body.append(' - [ ] Remove and re-add the "Rebuild" label to the PR to trigger just this workflow.')
-    body.append(' - [ ] Wait for the "Rebuild" workflow to push a commit updating the distribution files.')
-
  body.append(' - [ ] Mark the PR as ready for review to trigger the full set of PR checks.')
  body.append(' - [ ] Approve and merge this PR. Make sure `Create a merge commit` is selected rather than `Squash and merge` or `Rebase and merge`.')

@@ -109,13 +144,11 @@ def open_pr(
    body.append(' - [ ] Merge all backport PRs to older release branches, that will automatically be created once this PR is merged.')

  title = f'Merge {source_branch} into {target_branch}'
-  labels = ['Rebuild'] if not is_primary_release else []

  # Create the pull request
  # PR checks won't be triggered on PRs created by Actions. Therefore mark the PR as draft so that
  # a maintainer can take the PR out of draft, thereby triggering the PR checks.
  pr = repo.create_pull(title=title, body='\n'.join(body), head=new_branch_name, base=target_branch, draft=True)
-  pr.add_to_labels(*labels)
  print(f'Created PR #{str(pr.number)}')

  # Assign the conductor
@@ -270,12 +303,6 @@ def update_changelog(version):
 def main():
  parser = argparse.ArgumentParser('update-release-branch.py')

-  parser.add_argument(
-    '--github-token',
-    type=str,
-    required=True,
-    help='GitHub token, typically from GitHub Actions.'
-  )
  parser.add_argument(
    '--repository-nwo',
    type=str,
@@ -313,7 +340,7 @@ def main():
  target_branch = args.target_branch
  is_primary_release = args.is_primary_release

-  repo = Github(args.github_token).get_repo(args.repository_nwo)
+  repo = Github(get_github_token()).get_repo(args.repository_nwo)

  # the target branch will be of the form releases/vN, where N is the major version number
  target_branch_major_version = target_branch.strip('releases/v')
@@ -380,8 +407,9 @@ def main():
      # releases.
      run_git('revert', vOlder_update_commits[0], '--no-edit')

-      # Also revert the "Rebuild" commit created by Actions.
-      rebuild_commit = run_git('log', '--grep', '^Rebuild$', '--format=%H').split()[0]
+      # Also revert the "Rebuild" commit, whether created by this script or by the
+      # `Rebuild Action` workflow.
+      rebuild_commit = run_git('log', '--grep', f'^{REBUILD_COMMIT_MESSAGE}$', '--format=%H').split()[0]
      print(f'  Reverting {rebuild_commit}')
      run_git('revert', rebuild_commit, '--no-edit')

@@ -396,9 +424,10 @@ def main():
      run_git('add', '.')
      run_git('commit', '--no-edit')

-    # Migrate the package version number from a vLatest version number to a vOlder version number
+    # Migrate the package version number from a vLatest version number to a vOlder version number.
+    # `package-lock.json` is updated as part of the subsequent rebuild step (see `rebuild_action`).
    print(f'Setting version number to {version} in package.json')
-    replace_version_package_json(get_current_version(), version) # We rely on the `Rebuild` workflow to update package-lock.json
+    replace_version_package_json(get_current_version(), version)
    run_git('add', 'package.json')

    # Migrate the changelog notes from vLatest version numbers to vOlder version numbers
@@ -421,6 +450,13 @@ def main():
    run_git('add', 'CHANGELOG.md')
    run_git('commit', '-m', f'Update changelog for v{version}')

+  if not is_primary_release:
+    if len(conflicted_files) == 0:
+      print('Rebuilding the Action.')
+      rebuild_action()
+    else:
+      print(f'Skipping automatic rebuild because the merge produced conflicts in {conflicted_files}.')
+
  run_git('push', ORIGIN, new_branch_name)

  # Open a PR to update the branch
@@ -49,10 +49,6 @@ jobs:
      fail-fast: false
      matrix:
        include:
-          - os: ubuntu-latest
-            version: stable-v2.17.6
-          - os: ubuntu-latest
-            version: stable-v2.18.4
          - os: ubuntu-latest
            version: stable-v2.19.4
          - os: ubuntu-latest
@@ -61,6 +57,10 @@ jobs:
            version: stable-v2.21.4
          - os: ubuntu-latest
            version: stable-v2.22.4
+          - os: ubuntu-latest
+            version: stable-v2.23.9
+          - os: ubuntu-latest
+            version: stable-v2.24.3
          - os: ubuntu-latest
            version: default
          - os: ubuntu-latest
@@ -49,10 +49,6 @@ jobs:
      fail-fast: false
      matrix:
        include:
-          - os: ubuntu-latest
-            version: stable-v2.17.6
-          - os: ubuntu-latest
-            version: stable-v2.18.4
          - os: ubuntu-latest
            version: stable-v2.19.4
          - os: ubuntu-latest
@@ -61,6 +57,10 @@ jobs:
            version: stable-v2.21.4
          - os: ubuntu-latest
            version: stable-v2.22.4
+          - os: ubuntu-latest
+            version: stable-v2.23.9
+          - os: ubuntu-latest
+            version: stable-v2.24.3
          - os: ubuntu-latest
            version: default
          - os: ubuntu-latest
@@ -49,10 +49,6 @@ jobs:
      fail-fast: false
      matrix:
        include:
-          - os: ubuntu-latest
-            version: stable-v2.17.6
-          - os: ubuntu-latest
-            version: stable-v2.18.4
          - os: ubuntu-latest
            version: stable-v2.19.4
          - os: ubuntu-latest
@@ -61,6 +57,10 @@ jobs:
            version: stable-v2.21.4
          - os: ubuntu-latest
            version: stable-v2.22.4
+          - os: ubuntu-latest
+            version: stable-v2.23.9
+          - os: ubuntu-latest
+            version: stable-v2.24.3
          - os: ubuntu-latest
            version: default
          - os: ubuntu-latest
@@ -59,41 +59,41 @@ jobs:
      fail-fast: false
      matrix:
        include:
-          - os: ubuntu-latest
-            version: stable-v2.17.6
-          - os: macos-latest
-            version: stable-v2.17.6
-          - os: ubuntu-latest
-            version: stable-v2.18.4
-          - os: macos-latest
-            version: stable-v2.18.4
          - os: ubuntu-latest
            version: stable-v2.19.4
-          - os: macos-latest
+          - os: macos-latest-xlarge
            version: stable-v2.19.4
          - os: ubuntu-latest
            version: stable-v2.20.7
-          - os: macos-latest
+          - os: macos-latest-xlarge
            version: stable-v2.20.7
          - os: ubuntu-latest
            version: stable-v2.21.4
-          - os: macos-latest
+          - os: macos-latest-xlarge
            version: stable-v2.21.4
          - os: ubuntu-latest
            version: stable-v2.22.4
-          - os: macos-latest
+          - os: macos-latest-xlarge
            version: stable-v2.22.4
+          - os: ubuntu-latest
+            version: stable-v2.23.9
+          - os: macos-latest-xlarge
+            version: stable-v2.23.9
+          - os: ubuntu-latest
+            version: stable-v2.24.3
+          - os: macos-latest-xlarge
+            version: stable-v2.24.3
          - os: ubuntu-latest
            version: default
-          - os: macos-latest
+          - os: macos-latest-xlarge
            version: default
          - os: ubuntu-latest
            version: linked
-          - os: macos-latest
+          - os: macos-latest-xlarge
            version: linked
          - os: ubuntu-latest
            version: nightly-latest
-          - os: macos-latest
+          - os: macos-latest-xlarge
            version: nightly-latest
    name: Multi-language repository
    if: github.triggering_actor != 'dependabot[bot]'
@@ -59,7 +59,7 @@ jobs:
          use-all-platform-bundle: 'false'
          setup-kotlin: 'true'
      - name: Set up Ruby
-        uses: ruby/setup-ruby@0cb964fd540e0a24c900370abf38a33466142735 # v1.305.0
+        uses: ruby/setup-ruby@6aaa311d81eba98ae12eaffbcb63296ace0efcde # v1.307.0
        with:
          ruby-version: 2.6
      - name: Install Code Scanning integration
@@ -40,7 +40,7 @@ jobs:
      matrix:
        include:
          - os: ubuntu-latest
-            version: stable-v2.19.3
+            version: stable-v2.19.4
          - os: ubuntu-latest
            version: stable-v2.22.1
          - os: ubuntu-latest
@@ -39,7 +39,7 @@ jobs:
      fail-fast: false
      matrix:
        include:
-          - os: macos-latest
+          - os: macos-latest-xlarge
            version: nightly-latest
    name: Swift analysis using autobuild
    if: github.triggering_actor != 'dependabot[bot]'
@@ -9,6 +9,10 @@ on:
    # by other workflows.
    types: [opened, synchronize, reopened, ready_for_review]

+concurrency:
+  cancel-in-progress: ${{ github.event_name == 'pull_request' || false }}
+  group: ${{ github.workflow }}-${{ github.ref }}
+
 defaults:
  run:
    shell: bash
@@ -77,7 +77,7 @@ jobs:
    strategy:
      fail-fast: false
      matrix:
-        os: [ubuntu-22.04,ubuntu-24.04,windows-2022,windows-2025,macos-14,macos-15]
+        os: [ubuntu-22.04,ubuntu-24.04,windows-2022,windows-2025,macos-14-xlarge,macos-15-xlarge]
        tools: ${{ fromJson(needs.check-codeql-versions.outputs.versions) }}
    runs-on: ${{ matrix.os }}

@@ -6,13 +6,6 @@ env:
  # Diff informed queries add an additional query filter which is not yet
  # taken into account by these tests.
  CODEQL_ACTION_DIFF_INFORMED_QUERIES: false
-  # Specify overlay enablement manually to ensure stability around the exclude-from-incremental
-  # query filter. Here we only enable for the default code scanning suite.
-  CODEQL_ACTION_OVERLAY_ANALYSIS: true
-  CODEQL_ACTION_OVERLAY_ANALYSIS_JAVASCRIPT: false
-  CODEQL_ACTION_OVERLAY_ANALYSIS_CODE_SCANNING_JAVASCRIPT: true
-  CODEQL_ACTION_OVERLAY_ANALYSIS_STATUS_CHECK: false
-  CODEQL_ACTION_OVERLAY_ANALYSIS_SKIP_RESOURCE_CHECKS: true

 on:
  push:
@@ -31,6 +24,10 @@ on:
    - cron: '0 5 * * *'
  workflow_dispatch:

+concurrency:
+  cancel-in-progress: ${{ github.event_name == 'pull_request' || false }}
+  group: ${{ github.workflow }}-${{ github.ref }}
+
 defaults:
  run:
    shell: bash
@@ -79,33 +76,13 @@ jobs:
      with:
        version: ${{ matrix.version }}

-    # On PRs, overlay analysis may change the config that is passed to the CLI.
-    # Therefore, we have two variants of the following test, one for PRs and one for other events.
-    - name: Empty file (non-PR)
-      if: github.event_name != 'pull_request'
+    - name: Empty file
      uses: ./../action/.github/actions/check-codescanning-config
      with:
        expected-config-file-contents: "{}"
        languages: javascript
        tools: ${{ steps.prepare-test.outputs.tools-url }}

-    - name: Empty file (PR)
-      if: github.event_name == 'pull_request'
-      uses: ./../action/.github/actions/check-codescanning-config
-      with:
-        expected-config-file-contents: |
-          {
-            "query-filters": [
-              {
-                "exclude": {
-                  "tags": "exclude-from-incremental"
-                }
-              }
-            ]
-          }
-        languages: javascript
-        tools: ${{ steps.prepare-test.outputs.tools-url }}
-
    - name: Packs from input
      if: success() || failure()
      uses: ./../action/.github/actions/check-codescanning-config
@@ -20,6 +20,10 @@ on:
    - cron: '0 5 * * *'
  workflow_dispatch:

+concurrency:
+  cancel-in-progress: ${{ github.event_name == 'pull_request' || false }}
+  group: ${{ github.workflow }}-${{ github.ref }}
+
 defaults:
  run:
    shell: bash
@@ -19,6 +19,10 @@ on:
    - cron: '0 5 * * *'
  workflow_dispatch:

+concurrency:
+  cancel-in-progress: ${{ github.event_name == 'pull_request' || false }}
+  group: ${{ github.workflow }}-${{ github.ref }}
+
 defaults:
  run:
    shell: bash
@@ -48,6 +48,9 @@ jobs:
        with:
          fetch-depth: 0  # ensure we have all tags and can push commits
      - uses: actions/setup-node@v6
+        with:
+          node-version: 24
+          cache: 'npm'
      - uses: actions/setup-python@v6
        with:
          python-version: '3.12'
@@ -131,7 +134,7 @@ jobs:
          echo "::endgroup::"

      - name: Generate token
-        uses: actions/create-github-app-token@v3.1.1
+        uses: actions/create-github-app-token@v3.2.0
        id: app-token
        with:
          app-id: ${{ vars.AUTOMATION_APP_ID }}
@@ -10,6 +10,10 @@ on:
    types: [checks_requested]
  workflow_dispatch:

+concurrency:
+  cancel-in-progress: ${{ github.event_name == 'pull_request' || false }}
+  group: ${{ github.workflow }}-${{ github.ref }}
+
 defaults:
  run:
    shell: bash
@@ -14,6 +14,10 @@ on:
    - cron: '0 0 * * 1'
  workflow_dispatch:

+concurrency:
+  cancel-in-progress: ${{ github.event_name == 'pull_request' || false }}
+  group: ${{ github.workflow }}-${{ github.ref }}
+
 defaults:
  run:
    shell: bash
@@ -17,6 +17,10 @@ on:
    - cron: '0 5 * * *'
  workflow_dispatch:

+concurrency:
+  cancel-in-progress: ${{ github.event_name == 'pull_request' || false }}
+  group: ${{ github.workflow }}-${{ github.ref }}
+
 defaults:
  run:
    shell: bash
@@ -136,7 +136,7 @@ jobs:

      - name: Generate token
        if: github.event_name == 'workflow_dispatch'
-        uses: actions/create-github-app-token@v3.1.1
+        uses: actions/create-github-app-token@v3.2.0
        id: app-token
        with:
          app-id: ${{ vars.AUTOMATION_APP_ID }}
@@ -18,6 +18,11 @@ on:
  schedule:
    - cron: '0 5 * * *'
  workflow_dispatch:
+
+concurrency:
+  cancel-in-progress: ${{ github.event_name == 'pull_request' || false }}
+  group: ${{ github.workflow }}-${{ github.ref }}
+
 defaults:
  run:
    shell: bash
@@ -64,11 +64,12 @@ jobs:

    - name: Update current release branch
      if: github.event_name == 'workflow_dispatch'
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      run: |
        echo SOURCE_BRANCH=${REF_NAME}
        echo TARGET_BRANCH=releases/${MAJOR_VERSION}
        python .github/update-release-branch.py \
-          --github-token ${{ secrets.GITHUB_TOKEN }} \
          --repository-nwo ${{ github.repository }} \
          --source-branch '${{ env.REF_NAME }}' \
          --target-branch 'releases/${{ env.MAJOR_VERSION }}' \
@@ -93,7 +94,7 @@ jobs:
      pull-requests: write # needed to create pull request
    steps:
    - name: Generate token
-      uses: actions/create-github-app-token@v3.1.1
+      uses: actions/create-github-app-token@v3.2.0
      id: app-token
      with:
        app-id: ${{ vars.AUTOMATION_APP_ID }}
@@ -107,11 +108,12 @@ jobs:
    - uses: ./.github/actions/release-initialise

    - name: Update older release branch
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      run: |
        echo SOURCE_BRANCH=${SOURCE_BRANCH}
        echo TARGET_BRANCH=${TARGET_BRANCH}
        python .github/update-release-branch.py \
-          --github-token ${{ secrets.GITHUB_TOKEN }} \
          --repository-nwo ${{ github.repository }} \
          --source-branch ${SOURCE_BRANCH} \
          --target-branch ${TARGET_BRANCH} \
@@ -19,7 +19,7 @@
    "scope": "javascript, typescript",
    "prefix": "testMacro",
    "body": [
-      "const ${1:nameMacro} = test.macro({",
+      "const ${1:nameMacro} = makeMacro({",
      "  exec: async (t: ExecutionContext<unknown>) => {},",
      "",
      "  title: (providedTitle = \"\") => `${2:common title} - \\${providedTitle}`,",
@@ -2,7 +2,23 @@

 See the [releases page](https://github.com/github/codeql-action/releases) for the relevant changes to the CodeQL CLI and language packs.

-## 3.35.3 - 01 May 2026
+## [UNRELEASED]
+
+- _Breaking change_: Bump the minimum required CodeQL bundle version to 2.19.4. [#3894](https://github.com/github/codeql-action/pull/3894)
+- Add support for SHA-256 Git object IDs. [#3893](https://github.com/github/codeql-action/pull/3893)
+
+## 4.35.5 - 15 May 2026
+
+- We have improved how the JavaScript bundles for the CodeQL Action are generated to avoid duplication across bundles and reduce the size of the repository by around 70%. This should have no effect on the runtime behaviour of the CodeQL Action. [#3899](https://github.com/github/codeql-action/pull/3899)
+- For performance and accuracy reasons, [improved incremental analysis](https://github.com/github/roadmap/issues/1158) will now only be enabled on a pull request when diff-informed analysis is also enabled for that run. If diff-informed analysis is unavailable (for example, because the PR diff ranges could not be computed), the action will fall back to a full analysis. [#3791](https://github.com/github/codeql-action/pull/3791)
+- If multiple inputs are provided for the GitHub-internal `analysis-kinds` input, only `code-scanning` will be enabled. The `analysis-kinds` input is experimental, for GitHub-internal use only, and may change without notice at any time. [#3892](https://github.com/github/codeql-action/pull/3892)
+- Added an experimental change which, when running a Code Scanning analysis for a PR with [improved incremental analysis](https://github.com/github/roadmap/issues/1158) enabled, prefers CodeQL CLI versions that have a cached overlay-base database for the configured languages. This speeds up analysis for a repository when there is not yet a cached overlay-base database for the latest CLI version. We expect to roll this change out to everyone in May. [#3880](https://github.com/github/codeql-action/pull/3880)
+
+## 4.35.4 - 07 May 2026
+
+- Update default CodeQL bundle version to [2.25.4](https://github.com/github/codeql-action/releases/tag/codeql-bundle-v2.25.4). [#3881](https://github.com/github/codeql-action/pull/3881)
+
+## 4.35.3 - 01 May 2026

 - _Upcoming breaking change_: Add a deprecation warning for customers using CodeQL version 2.19.3 and earlier. These versions of CodeQL were discontinued on 9 April 2026 alongside GitHub Enterprise Server 3.15, and will be unsupported by the next minor release of the CodeQL Action. [#3837](https://github.com/github/codeql-action/pull/3837)
 - Configurations for private registries that use Cloudsmith or GCP OIDC are now accepted. [#3850](https://github.com/github/codeql-action/pull/3850)
@@ -10,7 +26,7 @@ See the [releases page](https://github.com/github/codeql-action/releases) for th
 - Fixed a bug where two diagnostics produced within the same millisecond could overwrite each other on disk, causing one of them to be lost. [#3852](https://github.com/github/codeql-action/pull/3852)
 - Update default CodeQL bundle version to [2.25.3](https://github.com/github/codeql-action/releases/tag/codeql-bundle-v2.25.3). [#3865](https://github.com/github/codeql-action/pull/3865)

-## 3.35.2 - 15 Apr 2026
+## 4.35.2 - 15 Apr 2026

 - The undocumented TRAP cache cleanup feature that could be enabled using the `CODEQL_ACTION_CLEANUP_TRAP_CACHES` environment variable is deprecated and will be removed in May 2026. If you are affected by this, we recommend disabling TRAP caching by passing the `trap-caching: false` input to the `init` Action. [#3795](https://github.com/github/codeql-action/pull/3795)
 - The Git version 2.36.0 requirement for improved incremental analysis now only applies to repositories that contain submodules. [#3789](https://github.com/github/codeql-action/pull/3789)
@@ -18,28 +34,29 @@ See the [releases page](https://github.com/github/codeql-action/releases) for th
 - Fixed a bug in the validation of OIDC configurations for private registries that was added in CodeQL Action 4.33.0 / 3.33.0. [#3807](https://github.com/github/codeql-action/pull/3807)
 - Update default CodeQL bundle version to [2.25.2](https://github.com/github/codeql-action/releases/tag/codeql-bundle-v2.25.2). [#3823](https://github.com/github/codeql-action/pull/3823)

-## 3.35.1 - 27 Mar 2026
+## 4.35.1 - 27 Mar 2026

 - Fix incorrect minimum required Git version for [improved incremental analysis](https://github.com/github/roadmap/issues/1158): it should have been 2.36.0, not 2.11.0. [#3781](https://github.com/github/codeql-action/pull/3781)

-## 3.35.0 - 27 Mar 2026
+## 4.35.0 - 27 Mar 2026

 - Reduced the minimum Git version required for [improved incremental analysis](https://github.com/github/roadmap/issues/1158) from 2.38.0 to 2.11.0. [#3767](https://github.com/github/codeql-action/pull/3767)
 - Update default CodeQL bundle version to [2.25.1](https://github.com/github/codeql-action/releases/tag/codeql-bundle-v2.25.1). [#3773](https://github.com/github/codeql-action/pull/3773)

-## 3.34.1 - 20 Mar 2026
+## 4.34.1 - 20 Mar 2026

 - Downgrade default CodeQL bundle version to [2.24.3](https://github.com/github/codeql-action/releases/tag/codeql-bundle-v2.24.3) due to issues with a small percentage of Actions and JavaScript analyses. [#3762](https://github.com/github/codeql-action/pull/3762)

-## 3.34.0 - 20 Mar 2026
+## 4.34.0 - 20 Mar 2026

 - Added an experimental change which disables TRAP caching when [improved incremental analysis](https://github.com/github/roadmap/issues/1158) is enabled, since improved incremental analysis supersedes TRAP caching. This will improve performance and reduce Actions cache usage. We expect to roll this change out to everyone in March. [#3569](https://github.com/github/codeql-action/pull/3569)
 - We are rolling out improved incremental analysis to C/C++ analyses that use build mode `none`. We expect this rollout to be complete by the end of April 2026. [#3584](https://github.com/github/codeql-action/pull/3584)
 - Update default CodeQL bundle version to [2.25.0](https://github.com/github/codeql-action/releases/tag/codeql-bundle-v2.25.0). [#3585](https://github.com/github/codeql-action/pull/3585)

-## 3.33.0 - 16 Mar 2026
+## 4.33.0 - 16 Mar 2026

 - Upcoming change: Starting April 2026, the CodeQL Action will skip collecting file coverage information on pull requests to improve analysis performance. File coverage information will still be computed on non-PR analyses. Pull request analyses will log a warning about this upcoming change. [#3562](https://github.com/github/codeql-action/pull/3562)
+
  To opt out of this change:
  - **Repositories owned by an organization:** Create a custom repository property with the name `github-codeql-file-coverage-on-prs` and the type "True/false", then set this property to `true` in the repository's settings. For more information, see [Managing custom properties for repositories in your organization](https://docs.github.com/en/organizations/managing-organization-settings/managing-custom-properties-for-repositories-in-your-organization). Alternatively, if you are using an advanced setup workflow, you can set the `CODEQL_ACTION_FILE_COVERAGE_ON_PRS` environment variable to `true` in your workflow.
  - **User-owned repositories using default setup:** Switch to an advanced setup workflow and set the `CODEQL_ACTION_FILE_COVERAGE_ON_PRS` environment variable to `true` in your workflow.
@@ -50,11 +67,11 @@ See the [releases page](https://github.com/github/codeql-action/releases) for th
 - Fixed the retry mechanism for database uploads. Previously this would fail with the error "Response body object should not be disturbed or locked". [#3564](https://github.com/github/codeql-action/pull/3564)
 - A warning is now emitted if the CodeQL Action detects a repository property whose name suggests that it relates to the CodeQL Action, but which is not one of the properties recognised by the current version of the CodeQL Action. [#3570](https://github.com/github/codeql-action/pull/3570)

-## 3.32.6 - 05 Mar 2026
+## 4.32.6 - 05 Mar 2026

 - Update default CodeQL bundle version to [2.24.3](https://github.com/github/codeql-action/releases/tag/codeql-bundle-v2.24.3). [#3548](https://github.com/github/codeql-action/pull/3548)

-## 3.32.5 - 02 Mar 2026
+## 4.32.5 - 02 Mar 2026

 - Repositories owned by an organization can now set up the `github-codeql-disable-overlay` custom repository property to disable [improved incremental analysis for CodeQL](https://github.com/github/roadmap/issues/1158). First, create a custom repository property with the name `github-codeql-disable-overlay` and the type "True/false" in the organization's settings. Then in the repository's settings, set this property to `true` to disable improved incremental analysis. For more information, see [Managing custom properties for repositories in your organization](https://docs.github.com/en/organizations/managing-organization-settings/managing-custom-properties-for-repositories-in-your-organization). This feature is not yet available on GitHub Enterprise Server. [#3507](https://github.com/github/codeql-action/pull/3507)
 - Added an experimental change so that when [improved incremental analysis](https://github.com/github/roadmap/issues/1158) fails on a runner — potentially due to insufficient disk space — the failure is recorded in the Actions cache so that subsequent runs will automatically skip improved incremental analysis until something changes (e.g. a larger runner is provisioned or a new CodeQL version is released). We expect to roll this change out to everyone in March. [#3487](https://github.com/github/codeql-action/pull/3487)
@@ -64,7 +81,7 @@ See the [releases page](https://github.com/github/codeql-action/releases) for th
 - Added an experimental change which allows the `start-proxy` action to resolve the CodeQL CLI version from feature flags instead of using the linked CLI bundle version. We expect to roll this change out to everyone in March. [#3512](https://github.com/github/codeql-action/pull/3512)
 - The previously experimental changes from versions 4.32.3, 4.32.4, 3.32.3 and 3.32.4 are now enabled by default. [#3503](https://github.com/github/codeql-action/pull/3503), [#3504](https://github.com/github/codeql-action/pull/3504)

-## 3.32.4 - 20 Feb 2026
+## 4.32.4 - 20 Feb 2026

 - Update default CodeQL bundle version to [2.24.2](https://github.com/github/codeql-action/releases/tag/codeql-bundle-v2.24.2). [#3493](https://github.com/github/codeql-action/pull/3493)
 - Added an experimental change which improves how certificates are generated for the authentication proxy that is used by the CodeQL Action in Default Setup when [private package registries are configured](https://docs.github.com/en/code-security/how-tos/secure-at-scale/configure-organization-security/manage-usage-and-access/giving-org-access-private-registries). This is expected to generate more widely compatible certificates and should have no impact on analyses which are working correctly already. We expect to roll this change out to everyone in February. [#3473](https://github.com/github/codeql-action/pull/3473)
@@ -72,88 +89,88 @@ See the [releases page](https://github.com/github/codeql-action/releases) for th
 - Added a setting which allows the CodeQL Action to enable network debugging for Java programs. This will help GitHub staff support customers with troubleshooting issues in GitHub-managed CodeQL workflows, such as Default Setup. This setting can only be enabled by GitHub staff. [#3485](https://github.com/github/codeql-action/pull/3485)
 - Added a setting which enables GitHub-managed workflows, such as Default Setup, to use a [nightly CodeQL CLI release](https://github.com/dsp-testing/codeql-cli-nightlies) instead of the latest, stable release that is used by default. This will help GitHub staff support customers whose analyses for a given repository or organization require early access to a change in an upcoming CodeQL CLI release. This setting can only be enabled by GitHub staff. [#3484](https://github.com/github/codeql-action/pull/3484)

-## 3.32.3 - 13 Feb 2026
+## 4.32.3 - 13 Feb 2026

 - Added experimental support for testing connections to [private package registries](https://docs.github.com/en/code-security/how-tos/secure-at-scale/configure-organization-security/manage-usage-and-access/giving-org-access-private-registries). This feature is not currently enabled for any analysis. In the future, it may be enabled by default for Default Setup. [#3466](https://github.com/github/codeql-action/pull/3466)

-## 3.32.2 - 05 Feb 2026
+## 4.32.2 - 05 Feb 2026

 - Update default CodeQL bundle version to [2.24.1](https://github.com/github/codeql-action/releases/tag/codeql-bundle-v2.24.1). [#3460](https://github.com/github/codeql-action/pull/3460)

-## 3.32.1 - 02 Feb 2026
+## 4.32.1 - 02 Feb 2026

 - A warning is now shown in Default Setup workflow logs if a [private package registry is configured](https://docs.github.com/en/code-security/how-tos/secure-at-scale/configure-organization-security/manage-usage-and-access/giving-org-access-private-registries) using a GitHub Personal Access Token (PAT), but no username is configured. [#3422](https://github.com/github/codeql-action/pull/3422)
 - Fixed a bug which caused the CodeQL Action to fail when repository properties cannot successfully be retrieved. [#3421](https://github.com/github/codeql-action/pull/3421)

-## 3.32.0 - 26 Jan 2026
+## 4.32.0 - 26 Jan 2026

 - Update default CodeQL bundle version to [2.24.0](https://github.com/github/codeql-action/releases/tag/codeql-bundle-v2.24.0). [#3425](https://github.com/github/codeql-action/pull/3425)

-## 3.31.11 - 23 Jan 2026
+## 4.31.11 - 23 Jan 2026

 - When running a Default Setup workflow with [Actions debugging enabled](https://docs.github.com/en/actions/how-tos/monitor-workflows/enable-debug-logging), the CodeQL Action will now use more unique names when uploading logs from the Dependabot authentication proxy as workflow artifacts. This ensures that the artifact names do not clash between multiple jobs in a build matrix. [#3409](https://github.com/github/codeql-action/pull/3409)
 - Improved error handling throughout the CodeQL Action. [#3415](https://github.com/github/codeql-action/pull/3415)
 - Added experimental support for automatically excluding [generated files](https://docs.github.com/en/repositories/working-with-files/managing-files/customizing-how-changed-files-appear-on-github) from the analysis. This feature is not currently enabled for any analysis. In the future, it may be enabled by default for some GitHub-managed analyses. [#3318](https://github.com/github/codeql-action/pull/3318)
 - The changelog extracts that are included with releases of the CodeQL Action are now shorter to avoid duplicated information from appearing in Dependabot PRs. [#3403](https://github.com/github/codeql-action/pull/3403)

-## 3.31.10 - 12 Jan 2026
+## 4.31.10 - 12 Jan 2026

 - Update default CodeQL bundle version to 2.23.9. [#3393](https://github.com/github/codeql-action/pull/3393)

-## 3.31.9 - 16 Dec 2025
+## 4.31.9 - 16 Dec 2025

 No user facing changes.

-## 3.31.8 - 11 Dec 2025
+## 4.31.8 - 11 Dec 2025

 - Update default CodeQL bundle version to 2.23.8. [#3354](https://github.com/github/codeql-action/pull/3354)

-## 3.31.7 - 05 Dec 2025
+## 4.31.7 - 05 Dec 2025

 - Update default CodeQL bundle version to 2.23.7. [#3343](https://github.com/github/codeql-action/pull/3343)

-## 3.31.6 - 01 Dec 2025
+## 4.31.6 - 01 Dec 2025

 No user facing changes.

-## 3.31.5 - 24 Nov 2025
+## 4.31.5 - 24 Nov 2025

 - Update default CodeQL bundle version to 2.23.6. [#3321](https://github.com/github/codeql-action/pull/3321)

-## 3.31.4 - 18 Nov 2025
+## 4.31.4 - 18 Nov 2025

 No user facing changes.

-## 3.31.3 - 13 Nov 2025
+## 4.31.3 - 13 Nov 2025

 - CodeQL Action v3 will be deprecated in December 2026.  The Action now logs a warning for customers who are running v3 but could be running v4. For more information, see [Upcoming deprecation of CodeQL Action v3](https://github.blog/changelog/2025-10-28-upcoming-deprecation-of-codeql-action-v3/).
 - Update default CodeQL bundle version to 2.23.5. [#3288](https://github.com/github/codeql-action/pull/3288)

-## 3.31.2 - 30 Oct 2025
+## 4.31.2 - 30 Oct 2025

 No user facing changes.

-## 3.31.1 - 30 Oct 2025
+## 4.31.1 - 30 Oct 2025

 - The `add-snippets` input has been removed from the `analyze` action. This input has been deprecated since CodeQL Action 3.26.4 in August 2024 when this removal was announced.

-## 3.31.0 - 24 Oct 2025
+## 4.31.0 - 24 Oct 2025

 - Bump minimum CodeQL bundle version to 2.17.6. [#3223](https://github.com/github/codeql-action/pull/3223)
 - When SARIF files are uploaded by the `analyze` or `upload-sarif` actions, the CodeQL Action automatically performs post-processing steps to prepare the data for the upload. Previously, these post-processing steps were only performed before an upload took place. We are now changing this so that the post-processing steps will always be performed, even when the SARIF files are not uploaded. This does not change anything for the `upload-sarif` action. For `analyze`, this may affect Advanced Setup for CodeQL users who specify a value other than `always` for the `upload` input. [#3222](https://github.com/github/codeql-action/pull/3222)

-## 3.30.9 - 17 Oct 2025
+## 4.30.9 - 17 Oct 2025

 - Update default CodeQL bundle version to 2.23.3. [#3205](https://github.com/github/codeql-action/pull/3205)
 - Experimental: A new `setup-codeql` action has been added which is similar to `init`, except it only installs the CodeQL CLI and does not initialize a database. Do not use this in production as it is part of an internal experiment and subject to change at any time. [#3204](https://github.com/github/codeql-action/pull/3204)

-## 3.30.8 - 10 Oct 2025
+## 4.30.8 - 10 Oct 2025

 No user facing changes.

-## 3.30.7 - 06 Oct 2025
+## 4.30.7 - 06 Oct 2025

-No user facing changes.
+- [v4+ only] The CodeQL Action now runs on Node.js v24. [#3169](https://github.com/github/codeql-action/pull/3169)

 ## 3.30.6 - 02 Oct 2025

@@ -389,13 +406,17 @@ No user facing changes.
 ## 3.26.12 - 07 Oct 2024

 - _Upcoming breaking change_: Add a deprecation warning for customers using CodeQL version 2.14.5 and earlier. These versions of CodeQL were discontinued on 24 September 2024 alongside GitHub Enterprise Server 3.10, and will be unsupported by CodeQL Action versions 3.27.0 and later and versions 2.27.0 and later. [#2520](https://github.com/github/codeql-action/pull/2520)
+
  - If you are using one of these versions, please update to CodeQL CLI version 2.14.6 or later. For instance, if you have specified a custom version of the CLI using the 'tools' input to the 'init' Action, you can remove this input to use the default version.
+
  - Alternatively, if you want to continue using a version of the CodeQL CLI between 2.13.5 and 2.14.5, you can replace `github/codeql-action/*@v3` by `github/codeql-action/*@v3.26.11` and `github/codeql-action/*@v2` by `github/codeql-action/*@v2.26.11` in your code scanning workflow to ensure you continue using this version of the CodeQL Action.

 ## 3.26.11 - 03 Oct 2024

 - _Upcoming breaking change_: Add support for using `actions/download-artifact@v4` to programmatically consume CodeQL Action debug artifacts.
+
  Starting November 30, 2024, GitHub.com customers will [no longer be able to use `actions/download-artifact@v3`](https://github.blog/changelog/2024-04-16-deprecation-notice-v3-of-the-artifact-actions/). Therefore, to avoid breakage, customers who programmatically download the CodeQL Action debug artifacts should set the `CODEQL_ACTION_ARTIFACT_V4_UPGRADE` environment variable to `true` and bump `actions/download-artifact@v3` to `actions/download-artifact@v4` in their workflows. The CodeQL Action will enable this behavior by default in early November and workflows that have not yet bumped `actions/download-artifact@v3` to `actions/download-artifact@v4` will begin failing then.
+
  This change is currently unavailable for GitHub Enterprise Server customers, as `actions/upload-artifact@v4` and `actions/download-artifact@v4` are not yet compatible with GHES.
 - Update default CodeQL bundle version to 2.19.1. [#2519](https://github.com/github/codeql-action/pull/2519)

@@ -518,9 +539,12 @@ No user facing changes.
 ## 3.25.0 - 15 Apr 2024

 - The deprecated feature for extracting dependencies for a Python analysis has been removed. [#2224](https://github.com/github/codeql-action/pull/2224)
+
  As a result, the following inputs and environment variables are now ignored:
+
  - The `setup-python-dependencies` input to the `init` Action
  - The `CODEQL_ACTION_DISABLE_PYTHON_DEPENDENCY_INSTALLATION` environment variable
+
  We recommend removing any references to these from your workflows. For more information, see the release notes for CodeQL Action v3.23.0 and v2.23.0.
 - Automatically overwrite an existing database if found on the filesystem. [#2229](https://github.com/github/codeql-action/pull/2229)
 - Bump the minimum CodeQL bundle version to 2.12.6. [#2232](https://github.com/github/codeql-action/pull/2232)
@@ -71,7 +71,7 @@ Once the mergeback and backport pull request have been merged, the release is co

 Since the `codeql-action` runs most of its testing through individual Actions workflows, there are over two hundred required jobs that need to pass in order for a PR to turn green. It would be too tedious to maintain that list manually. You can regenerate the set of required checks automatically by running the [sync-checks.ts](pr-checks/sync-checks.ts) script:

- At a minimum, you must provide an argument for the `--token` input. For example, `--token "$(gh auth token)"` to use the same token that `gh` uses. If no token is provided or the token has insufficient permissions, the script will fail.
+- At a minimum, you must provide a token with permissions to update branch protection rules. For example, `gh auth token | pr-checks/sync-checks.ts --token-stdin` uses the same token that `gh` uses. You can also set the `GH_TOKEN` or `GITHUB_TOKEN` environment variable. If no token is provided or the token has insufficient permissions, the script will fail.
 - By default, the script performs a dry run and outputs information about the changes it would make to the branch protection rules. To actually apply the changes, specify the `--apply` flag.
 - If you run the script without any other arguments, it will retrieve the set of workflows that ran for the latest commit on `main`.
 - You can specify a different git ref with the `--ref` input. You will likely want to use this if you have a PR that removes or adds PR checks. For example, `--ref "some/branch/name"` to use the HEAD of the `some/branch/name` branch.
@@ -78,8 +78,6 @@ We typically release new minor versions of the CodeQL Action and Bundle when a n
 | `v3.28.21` | `2.21.3` | Enterprise Server 3.18 | |
 | `v3.28.12` | `2.20.7` | Enterprise Server 3.17 | |
 | `v3.28.6` | `2.20.3` | Enterprise Server 3.16 | |
-| `v3.28.6` | `2.20.3` | Enterprise Server 3.15 | |
-| `v3.28.6` | `2.20.3` | Enterprise Server 3.14 | |

 See the full list of GHES release and deprecation dates at [GitHub Enterprise Server releases](https://docs.github.com/en/enterprise-server/admin/all-releases#releases-of-github-enterprise-server).

@@ -94,6 +94,6 @@ outputs:
  sarif-id:
    description: The ID of the uploaded SARIF file.
 runs:
-  using: node20
-  main: "../lib/analyze-action.js"
-  post: "../lib/analyze-action-post.js"
+  using: node24
+  main: "../lib/analyze-entry.js"
+  post: "../lib/analyze-post-entry.js"
@@ -15,5 +15,5 @@ inputs:
      $GITHUB_WORKSPACE as its working directory.
    required: false
 runs:
-  using: node20
-  main: '../lib/autobuild-action.js'
+  using: node24
+  main: '../lib/autobuild-entry.js'
@@ -1,5 +1,5 @@
-import { copyFile, rm, writeFile } from "node:fs/promises";
-import { dirname, join } from "node:path";
+import { copyFile, readFile, rm, writeFile } from "node:fs/promises";
+import { basename, dirname, join } from "node:path";
 import { fileURLToPath } from "node:url";

 import * as esbuild from "esbuild";
@@ -62,18 +62,153 @@ const onEndPlugin = {
  },
 };

+/** The name of the virtual `entry-points` module. */
+const SHARED_ENTRYPOINT = "entry-points";
+
+/** The property name under which `upload-lib`'s namespace is exposed in `entry-points`. */
+const UPLOAD_LIB_EXPORT = "uploadLib";
+
+/** The relative source path of the `upload-lib` module that we re-export from `entry-points`. */
+const UPLOAD_LIB_SRC = "./src/upload-lib";
+
+/**
+ * This plugin finds all source files that contain Action entry points. It then generates the
+ * virtual `entry-points` module which imports all identified files, and re-exports their
+ * `runWrapper` functions with suitable aliases.
+ *
+ * The virtual module additionally re-exports `upload-lib` under the `uploadLib` namespace so that
+ * external consumers can access it via the small `lib/upload-lib.js` stub emitted below.
+ * 
+ * A tiny stub file is emitted for each Action entrypoint, and one for `upload-lib`. Each stub
+ * imports the shared bundle and calls/re-exports from the respective entry point.
+ *
+ * @type {esbuild.Plugin}
+ */
+const entryPointsPlugin = {
+  name: "entry-points",
+  setup(build) {
+    const namespace = "actions";
+    const actions = [];
+
+    const toPascal = (s) =>
+      s.replace(/(^|-)([a-z0-9])/gi, (_, __, c) => c.toUpperCase());
+
+    // Find the source files containing Action entry points.
+    build.onStart(() => {
+      const actionFiles = globSync("src/*-action{,-post}.ts");
+      for (const actionFile of actionFiles) {
+        const match = basename(actionFile).match(/(.*)-action(-post)?/);
+
+        if (match.length < 2) {
+          throw new Error(`'${actionFile}' didn't match expected pattern.`);
+        }
+
+        const actionName = match[1];
+        const isPost = match[2] !== undefined;
+
+        actions.push({
+          path: actionFile,
+          name: actionName,
+          isPost,
+          pascalCaseName: `${toPascal(actionName)}${isPost ? "Post" : ""}Action`,
+        });
+      }
+    });
+
+    // Resolve the virtual `entry-points` file and set the corresponding namespace.
+    // Ideally, we'd `RegExp.escape` the entrypoint here, but that API isn't supported in Node 20.
+    // Since we're dealing with a hardcoded string, this isn't too much of a problem.
+    build.onResolve({ filter: new RegExp(`^${SHARED_ENTRYPOINT}$`) }, () => {
+      return { path: SHARED_ENTRYPOINT, namespace };
+    });
+
+    // Generate the virtual `entry-points` file based on the Actions we discovered.
+    // Restrict using the namespace. The path filter does not need to discriminate any further.
+    build.onLoad({ filter: /.*/, namespace }, async () => {
+      const wrapperTemplatePath = "entry-wrapper.js.tpl";
+      const wrapperTemplate = await readFile(
+        join(SRC_DIR, wrapperTemplatePath),
+        "utf-8",
+      );
+
+      const actionsSorted = actions.sort((a, b) =>
+        a.name.localeCompare(b.name),
+      );
+      const imports = actionsSorted
+        .map(
+          (action) =>
+            `import * as ${action.pascalCaseName} from "./src/${basename(action.path)}";`,
+        )
+        .join("\n");
+      const wrappers = actionsSorted
+        .map((action) =>
+          wrapperTemplate.replaceAll("__ACTION__", action.pascalCaseName),
+        )
+        .join("\n\n");
+
+      // Also re-export the `upload-lib` namespace so that external consumers can reach it
+      // via the `lib/upload-lib.js` stub without us having to bundle a second copy.
+      const uploadLibReExport = `export * as ${UPLOAD_LIB_EXPORT} from "${UPLOAD_LIB_SRC}";`;
+
+      return {
+        contents: `"use strict";\n${imports}\n\n${uploadLibReExport}\n\n${wrappers}\n`,
+        resolveDir: ".",
+        loader: "ts",
+      };
+    });
+
+    // Emit entry point stubs for each Action using the entry template.
+    build.onEnd(async () => {
+      const makeHeader = (templatePath, sourceFile) =>
+        `// Automatically generated from '${templatePath}' for 'src/${basename(sourceFile)}'.\n\n`;
+
+      // Read the entry point template.
+      const actionTemplatePath = "action-entry.js.tpl";
+      const actionTemplate = await readFile(
+        join(SRC_DIR, actionTemplatePath),
+        "utf-8",
+      );
+
+      // Write entry point stubs for each Action.
+      for (const action of actions) {
+        await writeFile(
+          join(
+            OUT_DIR,
+            `${action.name}${action.isPost ? "-post" : ""}-entry.js`,
+          ),
+          makeHeader(actionTemplatePath, action.path) +
+            actionTemplate.replaceAll("__ACTION__", action.pascalCaseName),
+        );
+      }
+
+      // Write a small stub for `upload-lib` that re-exports it from the shared bundle.
+      // External callers (e.g. internal testing environments) `require("./lib/upload-lib")`
+      // and expect the same shape as before, so we expose the namespace as `module.exports`.
+      const uploadLibStubTemplatePath = "upload-lib-stub.js.tpl";
+      const uploadLibStubTemplate = await readFile(
+        join(SRC_DIR, uploadLibStubTemplatePath),
+        "utf-8",
+      );
+      await writeFile(
+        join(OUT_DIR, "upload-lib.js"),
+        makeHeader(uploadLibStubTemplatePath, `${UPLOAD_LIB_SRC}.ts`) +
+          uploadLibStubTemplate.replaceAll(
+            "__UPLOAD_LIB_EXPORT__",
+            UPLOAD_LIB_EXPORT,
+          ),
+      );
+    });
+  },
+};
+
 const context = await esbuild.context({
-  // Include upload-lib.ts as an entry point for use in testing environments.
-  entryPoints: globSync([
-    `${SRC_DIR}/*-action.ts`,
-    `${SRC_DIR}/*-action-post.ts`,
-    "src/upload-lib.ts",
-  ]),
+  entryPoints: [{ in: SHARED_ENTRYPOINT, out: SHARED_ENTRYPOINT }],
  bundle: true,
  format: "cjs",
  outdir: OUT_DIR,
  platform: "node",
-  plugins: [cleanPlugin, copyDefaultsPlugin, onEndPlugin],
+  external: ["./entry-points"],
+  plugins: [cleanPlugin, copyDefaultsPlugin, entryPointsPlugin, onEndPlugin],
  target: ["node20"],
  define: {
    __CODEQL_ACTION_VERSION__: JSON.stringify(pkg.version),
@@ -170,6 +170,6 @@ outputs:
  codeql-version:
    description: The version of the CodeQL binary used for analysis
 runs:
-  using: node20
-  main: '../lib/init-action.js'
-  post: '../lib/init-action-post.js'
+  using: node24
+  main: '../lib/init-entry.js'
+  post: '../lib/init-post-entry.js'
@@ -0,0 +1,6 @@
+// Automatically generated from 'action-entry.js.tpl' for 'src/analyze-action.ts'.
+
+"use strict";
+
+const import_entry_points = require("./entry-points");
+void (0, import_entry_points.runAnalyzeAction)();
@@ -0,0 +1,6 @@
+// Automatically generated from 'action-entry.js.tpl' for 'src/analyze-action-post.ts'.
+
+"use strict";
+
+const import_entry_points = require("./entry-points");
+void (0, import_entry_points.runAnalyzePostAction)();
@@ -0,0 +1,6 @@
+// Automatically generated from 'action-entry.js.tpl' for 'src/autobuild-action.ts'.
+
+"use strict";
+
+const import_entry_points = require("./entry-points");
+void (0, import_entry_points.runAutobuildAction)();
@@ -1,6 +1,6 @@
 {
-  "bundleVersion": "codeql-bundle-v2.25.3",
-  "cliVersion": "2.25.3",
-  "priorBundleVersion": "codeql-bundle-v2.25.2",
-  "priorCliVersion": "2.25.2"
+  "bundleVersion": "codeql-bundle-v2.25.4",
+  "cliVersion": "2.25.4",
+  "priorBundleVersion": "codeql-bundle-v2.25.3",
+  "priorCliVersion": "2.25.3"
 }
@@ -0,0 +1,6 @@
+// Automatically generated from 'action-entry.js.tpl' for 'src/init-action.ts'.
+
+"use strict";
+
+const import_entry_points = require("./entry-points");
+void (0, import_entry_points.runInitAction)();
@@ -0,0 +1,6 @@
+// Automatically generated from 'action-entry.js.tpl' for 'src/init-action-post.ts'.
+
+"use strict";
+
+const import_entry_points = require("./entry-points");
+void (0, import_entry_points.runInitPostAction)();
@@ -0,0 +1,6 @@
+// Automatically generated from 'action-entry.js.tpl' for 'src/resolve-environment-action.ts'.
+
+"use strict";
+
+const import_entry_points = require("./entry-points");
+void (0, import_entry_points.runResolveEnvironmentAction)();
@@ -0,0 +1,6 @@
+// Automatically generated from 'action-entry.js.tpl' for 'src/setup-codeql-action.ts'.
+
+"use strict";
+
+const import_entry_points = require("./entry-points");
+void (0, import_entry_points.runSetupCodeqlAction)();
@@ -0,0 +1,6 @@
+// Automatically generated from 'action-entry.js.tpl' for 'src/start-proxy-action.ts'.
+
+"use strict";
+
+const import_entry_points = require("./entry-points");
+void (0, import_entry_points.runStartProxyAction)();
@@ -0,0 +1,6 @@
+// Automatically generated from 'action-entry.js.tpl' for 'src/start-proxy-action-post.ts'.
+
+"use strict";
+
+const import_entry_points = require("./entry-points");
+void (0, import_entry_points.runStartProxyPostAction)();
@@ -0,0 +1,6 @@
+// Automatically generated from 'action-entry.js.tpl' for 'src/upload-sarif-action.ts'.
+
+"use strict";
+
+const import_entry_points = require("./entry-points");
+void (0, import_entry_points.runUploadSarifAction)();
@@ -0,0 +1,6 @@
+// Automatically generated from 'action-entry.js.tpl' for 'src/upload-sarif-action-post.ts'.
+
+"use strict";
+
+const import_entry_points = require("./entry-points");
+void (0, import_entry_points.runUploadSarifPostAction)();
@@ -1,18 +1,19 @@
 {
  "name": "codeql",
-  "version": "3.35.3",
+  "version": "4.36.0",
  "private": true,
  "description": "CodeQL action",
  "scripts": {
    "_build_comment": "echo 'Run the full build so we typecheck the project and can reuse the transpiled files in npm test'",
-    "build": "./scripts/check-node-modules.sh && npm run transpile && node build.mjs && npx tsx ./pr-checks/bundle-metadata.ts",
+    "build": "./scripts/check-node-modules.sh && npm run transpile && node build.mjs",
    "lint": "eslint --report-unused-disable-directives --max-warnings=0 .",
    "lint-ci": "SARIF_ESLINT_IGNORE_SUPPRESSED=true eslint --report-unused-disable-directives --max-warnings=0 . --format @microsoft/eslint-formatter-sarif --output-file=eslint.sarif",
    "lint-fix": "eslint --report-unused-disable-directives --max-warnings=0 . --fix",
    "ava": "npm run transpile && ava --verbose",
    "test": "npm run ava -- src/",
    "test-debug": "npm run test -- --timeout=20m",
-    "transpile": "tsc --build --verbose tsconfig.json"
+    "transpile": "tsc --build --verbose tsconfig.json",
+    "update-pr-checks": "./pr-checks/sync.sh"
  },
  "license": "MIT",
  "workspaces": [
@@ -43,32 +44,32 @@
    "uuid": "^14.0.0"
  },
  "devDependencies": {
-    "@ava/typescript": "7.0.0",
+    "@ava/typescript": "6.0.0",
    "@eslint/compat": "^2.0.5",
    "@microsoft/eslint-formatter-sarif": "^3.1.0",
    "@octokit/types": "^16.0.0",
    "@types/archiver": "^7.0.0",
    "@types/follow-redirects": "^1.14.4",
    "@types/js-yaml": "^4.0.9",
-    "@types/node": "^20.19.9",
+    "@types/node": "^20.19.39",
    "@types/node-forge": "^1.3.14",
    "@types/sarif": "^2.1.7",
    "@types/semver": "^7.7.1",
    "@types/sinon": "^21.0.1",
-    "ava": "^7.0.0",
+    "ava": "^6.4.1",
    "esbuild": "^0.28.0",
-    "eslint": "^9.39.2",
+    "eslint": "^9.39.4",
    "eslint-import-resolver-typescript": "^4.4.4",
    "eslint-plugin-github": "^6.0.0",
    "eslint-plugin-import-x": "^4.16.2",
    "eslint-plugin-jsdoc": "^62.9.0",
    "eslint-plugin-no-async-foreach": "^0.1.1",
    "glob": "^11.1.0",
-    "globals": "^17.5.0",
+    "globals": "^17.6.0",
    "nock": "^14.0.12",
-    "sinon": "^21.1.2",
-    "typescript": "^6.0.2",
-    "typescript-eslint": "^8.58.2"
+    "sinon": "^22.0.0",
+    "typescript": "^6.0.3",
+    "typescript-eslint": "^8.59.2"
  },
  "overrides": {
    "@actions/tool-cache": {
@@ -89,7 +90,7 @@
    "eslint-plugin-jsx-a11y": {
      "semver": ">=6.3.1"
    },
-    "brace-expansion@2.0.1": "2.0.2",
-    "glob": "^11.1.0"
+    "glob": "^11.1.0",
+    "undici": "^6.24.0"
  }
 }
@@ -2,7 +2,8 @@ name: "Multi-language repository"
 description: "An end-to-end integration test of a multi-language repository using automatic language detection"
 operatingSystems:
  - ubuntu
-  - macos
+  - os: macos
+    runner-image: macos-latest-xlarge
 env:
  CODEQL_ACTION_RESOLVE_SUPPORTED_LANGUAGES_USING_CLI: true
 installGo: true
@@ -5,7 +5,7 @@ versions:
  - default
 steps:
  - name: Set up Ruby
-    uses: ruby/setup-ruby@0cb964fd540e0a24c900370abf38a33466142735 # v1.305.0
+    uses: ruby/setup-ruby@6aaa311d81eba98ae12eaffbcb63296ace0efcde # v1.307.0
    with:
      ruby-version: 2.6
  - name: Install Code Scanning integration
@@ -2,7 +2,7 @@ name: "Rust analysis"
 description: "Tests creation of a Rust database"
 versions:
  # experimental rust support introduced, requires action to set `CODEQL_ENABLE_EXPERIMENTAL_FEATURES`
-  - stable-v2.19.3
+  - stable-v2.19.4
  # first public preview version
  - stable-v2.22.1
  - linked
@@ -3,7 +3,8 @@ description: "Tests creation of a Swift database using autobuild"
 versions:
  - nightly-latest
 operatingSystems:
-  - macos
+  - os: macos
+    runner-image: macos-latest-xlarge
 steps:
  - uses: ./../action/init
    id: init
@@ -7,10 +7,10 @@
    "@octokit/core": "^7.0.6",
    "@octokit/plugin-paginate-rest": ">=9.2.2",
    "@octokit/plugin-rest-endpoint-methods": "^17.0.0",
-    "yaml": "^2.8.3"
+    "yaml": "^2.8.4"
  },
  "devDependencies": {
-    "@types/node": "^20.19.9",
+    "@types/node": "^20.19.39",
    "tsx": "^4.21.0"
  }
 }
@@ -7,7 +7,13 @@ Tests for the sync-checks.ts script
 import * as assert from "node:assert/strict";
 import { describe, it } from "node:test";

-import { CheckInfo, Exclusions, Options, removeExcluded } from "./sync-checks";
+import {
+  CheckInfo,
+  Exclusions,
+  Options,
+  removeExcluded,
+  resolveToken,
+} from "./sync-checks";

 const defaultOptions: Options = {
  apply: false,
@@ -58,3 +64,46 @@ describe("removeExcluded", async () => {
    assert.deepEqual(retained, expectedExactMatches);
  });
 });
+
+describe("resolveToken", async () => {
+  await it("reads the token from standard input", async () => {
+    const token = await resolveToken(
+      { tokenStdin: true },
+      { env: {}, readStdin: async () => " stdin-token\n" },
+    );
+    assert.equal(token, "stdin-token");
+  });
+
+  await it("reads the token from the GH_TOKEN environment variable", async () => {
+    const token = await resolveToken(
+      {},
+      { env: { GH_TOKEN: "env-token" }, readStdin: async () => "" },
+    );
+    assert.equal(token, "env-token");
+  });
+
+  await it("reads the token from the GITHUB_TOKEN environment variable", async () => {
+    const token = await resolveToken(
+      {},
+      { env: { GITHUB_TOKEN: "env-token" }, readStdin: async () => "" },
+    );
+    assert.equal(token, "env-token");
+  });
+
+  await it("rejects an empty standard input token", async () => {
+    await assert.rejects(
+      resolveToken(
+        { tokenStdin: true },
+        { env: {}, readStdin: async () => "\n" },
+      ),
+      /No token received on standard input/,
+    );
+  });
+
+  await it("rejects missing token sources", async () => {
+    await assert.rejects(
+      resolveToken({}, { env: {}, readStdin: async () => "" }),
+      /Missing authentication token/,
+    );
+  });
+});
@@ -15,8 +15,8 @@ import {

 /** Represents the command-line options. */
 export interface Options {
-  /** The token to use to authenticate to the GitHub API. */
-  token?: string;
+  /** Whether to read the GitHub API token from standard input. */
+  tokenStdin?: boolean;
  /** The git ref to use the checks for. */
  ref?: string;
  /** Whether to actually apply the changes or not. */
@@ -31,6 +31,65 @@ const codeqlActionRepo = {
  repo: "codeql-action",
 };

+/** Environment variables to check for a GitHub API token. */
+const TOKEN_ENVIRONMENT_VARIABLES = ["GH_TOKEN", "GITHUB_TOKEN"];
+
+/** Represents the sources from which we can retrieve the GitHub API token. */
+interface TokenSource {
+  /** Environment variables to inspect. */
+  env: NodeJS.ProcessEnv;
+  /** Reads a token from standard input. */
+  readStdin: () => Promise<string>;
+}
+
+/** Reads the GitHub API token from standard input. */
+async function readTokenFromStdin(): Promise<string> {
+  let token = "";
+  process.stdin.setEncoding("utf8");
+  for await (const chunk of process.stdin) {
+    token += chunk;
+  }
+  return token.trim();
+}
+
+/** Gets a GitHub API token from one of the supported environment variables. */
+function getTokenFromEnvironment(env: NodeJS.ProcessEnv): string | undefined {
+  for (const variableName of TOKEN_ENVIRONMENT_VARIABLES) {
+    const token = env[variableName]?.trim();
+    if (token) {
+      return token;
+    }
+  }
+  return undefined;
+}
+
+/** Gets the token to use to authenticate to the GitHub API. */
+export async function resolveToken(
+  options: Pick<Options, "tokenStdin">,
+  tokenSource: TokenSource = {
+    env: process.env,
+    readStdin: readTokenFromStdin,
+  },
+): Promise<string> {
+  if (options.tokenStdin) {
+    const token = (await tokenSource.readStdin()).trim();
+    if (token.length === 0) {
+      throw new Error("No token received on standard input.");
+    }
+    return token;
+  }
+
+  const environmentToken = getTokenFromEnvironment(tokenSource.env);
+  if (environmentToken !== undefined) {
+    return environmentToken;
+  }
+
+  throw new Error(
+    "Missing authentication token. Set GH_TOKEN/GITHUB_TOKEN or pipe a token " +
+      "to --token-stdin.",
+  );
+}
+
 /** Represents a configuration of which checks should not be set up as required checks. */
 export interface Exclusions {
  /** A list of strings that, if contained in a check name, are excluded. */
@@ -205,9 +264,10 @@ async function updateBranch(
 async function main(): Promise<void> {
  const { values: options } = parseArgs({
    options: {
-      // The token to use to authenticate to the API.
-      token: {
-        type: "string",
+      // Read the token to use to authenticate to the API from standard input.
+      "token-stdin": {
+        type: "boolean",
+        default: false,
      },
      // The git ref for which to retrieve the check runs.
      ref: {
@@ -228,16 +288,16 @@ async function main(): Promise<void> {
    strict: true,
  });

-  if (options.token === undefined) {
-    throw new Error("Missing --token");
-  }
+  const token = await resolveToken({
+    tokenStdin: options["token-stdin"],
+  });

  console.info(
    `Oldest supported major version is: ${OLDEST_SUPPORTED_MAJOR_VERSION}`,
  );

  // Initialise the API client.
-  const client = getApiClient(options.token);
+  const client = getApiClient(token);

  // Find the check runs for the specified `ref` that we will later set as the required checks
  // for the main and release branches.
@@ -28,6 +28,24 @@ interface WorkflowInput {
 /** A partial mapping from known input names to input definitions. */
 type WorkflowInputs = Partial<Record<KnownInputName, WorkflowInput>>;

+/** An operating system identifier. */
+type OperatingSystemIdentifier = "ubuntu" | "macos" | "windows";
+
+/**
+ * Represents an operating system matrix entry for a generated PR check workflow.
+ *
+ * Either a string containing the OS identifier or an object containing the OS identifier and an
+ * optional runner image label.
+ */
+type OperatingSystem =
+  | OperatingSystemIdentifier
+  | {
+      /** OS identifier. */
+      os: OperatingSystemIdentifier;
+      /** Optional runner image label. */
+      "runner-image"?: string;
+    };
+
 /**
 * Represents PR check specifications.
 */
@@ -36,8 +54,8 @@ interface Specification extends JobSpecification {
  inputs?: Record<string, WorkflowInput>;
  /** CodeQL bundle versions to test against. Defaults to `DEFAULT_TEST_VERSIONS`. */
  versions?: string[];
-  /** Operating system prefixes used to select runner images (e.g. `["ubuntu", "macos"]`). */
-  operatingSystems?: string[];
+  /** Operating system prefixes, either as strings or with explicit runner image labels. */
+  operatingSystems?: OperatingSystem[];
  /** Per-OS version overrides. If specified for an OS, only those versions are tested on that OS. */
  osCodeQlVersions?: Record<string, string[]>;
  /** Whether to use the all-platform CodeQL bundle. */
@@ -97,10 +115,6 @@ type LanguageSetups = Partial<Record<BuiltInLanguage, LanguageSetup>>;
 // The default set of CodeQL Bundle versions to use for the PR checks.
 const defaultTestVersions = [
  // The oldest supported CodeQL version. If bumping, update `CODEQL_MINIMUM_VERSION` in `codeql.ts`
-  "stable-v2.17.6",
-  // The last CodeQL release in the 2.18 series.
-  "stable-v2.18.4",
-  // The last CodeQL release in the 2.19 series.
  "stable-v2.19.4",
  // The last CodeQL release in the 2.20 series.
  "stable-v2.20.7",
@@ -108,6 +122,10 @@ const defaultTestVersions = [
  "stable-v2.21.4",
  // The last CodeQL release in the 2.22 series.
  "stable-v2.22.4",
+  // The last CodeQL release in the 2.23 series.
+  "stable-v2.23.9",
+  // The last CodeQL release in the 2.24 series.
+  "stable-v2.24.3",
  // The default version of CodeQL for Dotcom, as determined by feature flags.
  "default",
  // The version of CodeQL shipped with the Action in `defaults.json`. During the release process
@@ -311,10 +329,19 @@ function generateJobMatrix(
      );
    }

-    const runnerImages = ["ubuntu-latest", "macos-latest", "windows-latest"];
+    const defaultRunnerImages = [
+      "ubuntu-latest",
+      "macos-latest",
+      "windows-latest",
+    ];
    const operatingSystems = checkSpecification.operatingSystems ?? ["ubuntu"];

-    for (const operatingSystem of operatingSystems) {
+    for (const operatingSystemConfig of operatingSystems) {
+      const operatingSystem =
+        typeof operatingSystemConfig === "string"
+          ? operatingSystemConfig
+          : operatingSystemConfig.os;
+
      // If osCodeQlVersions is set for this OS, only include the specified CodeQL versions.
      const allowedVersions =
        checkSpecification.osCodeQlVersions?.[operatingSystem];
@@ -322,9 +349,13 @@ function generateJobMatrix(
        continue;
      }

-      const runnerImagesForOs = runnerImages.filter((image) =>
-        image.startsWith(operatingSystem),
-      );
+      const runnerImagesForOs =
+        typeof operatingSystemConfig === "string" ||
+        operatingSystemConfig["runner-image"] === undefined
+          ? defaultRunnerImages.filter((image) =>
+              image.startsWith(operatingSystem),
+            )
+          : [operatingSystemConfig["runner-image"]];

      for (const runnerImage of runnerImagesForOs) {
        matrix.push({
@@ -21,5 +21,5 @@ outputs:
  environment:
    description: The inferred build environment configuration.
 runs:
-  using: node20
-  main: '../lib/resolve-environment-action.js'
+  using: node24
+  main: '../lib/resolve-environment-entry.js'
@@ -19,6 +19,25 @@ inputs:
      If not specified, the Action will check in several places until it finds
      the CodeQL tools.
    required: false
+  languages:
+    description: >-
+      A comma-separated list of CodeQL languages that will be analyzed in subsequent
+      `github/codeql-action/init` and `github/codeql-action/analyze` invocations. If specified, the
+      Action may use this list to select a CodeQL CLI version that is best suited to analyzing those
+      languages, for example by preferring a version that has a cached overlay-base database for the
+      specified languages. This input is not remembered and must also be passed to
+      `github/codeql-action/init`.
+    required: false
+  analysis-kinds:
+    description: >-
+      [Internal] A comma-separated list of analysis kinds that subsequent
+      `github/codeql-action/init` invocations will enable. If specified, the Action may use this
+      list to select a CodeQL CLI version that is best suited to those analysis kinds. This input is
+      not remembered and must also be passed to `github/codeql-action/init`.
+
+      Available options are the same as for the `analysis-kinds` input on the `init` Action.
+    default: 'code-scanning'
+    required: true
  token:
    description: GitHub token to use for authenticating with this instance of GitHub.
    default: ${{ github.token }}
@@ -35,5 +54,5 @@ outputs:
  codeql-version:
    description: The version of the CodeQL binary that was installed.
 runs:
-  using: node20
-  main: '../lib/setup-codeql-action.js'
+  using: node24
+  main: '../lib/setup-codeql-entry.js'
@@ -0,0 +1,4 @@
+"use strict";
+
+const import_entry_points = require("./entry-points");
+void (0, import_entry_points.run__ACTION__)();
@@ -16,7 +16,12 @@ import {
 } from "./analyses";
 import { EnvVar } from "./environment";
 import { getRunnerLogger } from "./logging";
-import { setupTests } from "./testing-utils";
+import {
+  createFeatures,
+  RecordingLogger,
+  setupBaseActionsVars,
+  setupTests,
+} from "./testing-utils";
 import { AssessmentPayload } from "./upload-lib/types";
 import { ConfigurationError } from "./util";

@@ -53,24 +58,91 @@ test("Parsing analysis kinds requires at least one analysis kind", async (t) =>
 test.serial(
  "getAnalysisKinds - returns expected analysis kinds for `analysis-kinds` input",
  async (t) => {
+    process.env[EnvVar.TEST_MODE] = "true";
+    const features = createFeatures([]);
    const requiredInputStub = sinon.stub(actionsUtil, "getRequiredInput");
    requiredInputStub
      .withArgs("analysis-kinds")
      .returns("code-scanning,code-quality");
-    const result = await getAnalysisKinds(getRunnerLogger(true), true);
+    const result = await getAnalysisKinds(
+      getRunnerLogger(true),
+      features,
+      true,
+    );
    t.assert(result.includes(AnalysisKind.CodeScanning));
    t.assert(result.includes(AnalysisKind.CodeQuality));
  },
 );

+test.serial(
+  "getAnalysisKinds - only use `code-scanning` for multiple analysis kinds outside of test mode",
+  async (t) => {
+    setupBaseActionsVars();
+    process.env[EnvVar.TEST_MODE] = "false";
+    const features = createFeatures([]);
+    const logger = new RecordingLogger();
+    const requiredInputStub = sinon.stub(actionsUtil, "getRequiredInput");
+    requiredInputStub
+      .withArgs("analysis-kinds")
+      .returns("code-scanning,code-quality");
+    const result = await getAnalysisKinds(logger, features, true);
+    t.deepEqual(result, [AnalysisKind.CodeScanning]);
+    t.assert(
+      logger.hasMessage(
+        "Continuing with only `analysis-kinds: code-scanning`.",
+      ),
+    );
+  },
+);
+
+test.serial(
+  "getAnalysisKinds - logs error for non-default `analysis-kinds` in custom workflow",
+  async (t) => {
+    setupBaseActionsVars({ GITHUB_EVENT_NAME: "push" });
+    process.env[EnvVar.TEST_MODE] = "false";
+    const features = createFeatures([]);
+    const logger = new RecordingLogger();
+    const requiredInputStub = sinon.stub(actionsUtil, "getRequiredInput");
+    requiredInputStub.withArgs("analysis-kinds").returns("code-quality");
+    const result = await getAnalysisKinds(logger, features, true);
+    t.deepEqual(result, [AnalysisKind.CodeQuality]);
+    t.assert(
+      logger.hasMessage(
+        "An analysis kind other than `code-scanning` was specified in a custom workflow.",
+      ),
+    );
+  },
+);
+
+test.serial(
+  "getAnalysisKinds - no error for non-default `analysis-kinds` in managed workflow",
+  async (t) => {
+    setupBaseActionsVars({ GITHUB_EVENT_NAME: "dynamic" });
+    process.env[EnvVar.TEST_MODE] = "false";
+    const features = createFeatures([]);
+    const logger = new RecordingLogger();
+    const requiredInputStub = sinon.stub(actionsUtil, "getRequiredInput");
+    requiredInputStub.withArgs("analysis-kinds").returns("code-quality");
+    const result = await getAnalysisKinds(logger, features, true);
+    t.deepEqual(result, [AnalysisKind.CodeQuality]);
+    t.deepEqual(logger.messages, []);
+  },
+);
+
 test.serial(
  "getAnalysisKinds - includes `code-quality` when deprecated `quality-queries` input is used",
  async (t) => {
+    process.env[EnvVar.TEST_MODE] = "true";
+    const features = createFeatures([]);
    const requiredInputStub = sinon.stub(actionsUtil, "getRequiredInput");
    requiredInputStub.withArgs("analysis-kinds").returns("code-scanning");
    const optionalInputStub = sinon.stub(actionsUtil, "getOptionalInput");
    optionalInputStub.withArgs("quality-queries").returns("code-quality");
-    const result = await getAnalysisKinds(getRunnerLogger(true), true);
+    const result = await getAnalysisKinds(
+      getRunnerLogger(true),
+      features,
+      true,
+    );
    t.assert(result.includes(AnalysisKind.CodeScanning));
    t.assert(result.includes(AnalysisKind.CodeQuality));
  },
@@ -79,9 +151,12 @@ test.serial(
 test.serial(
  "getAnalysisKinds - throws if `analysis-kinds` input is invalid",
  async (t) => {
+    const features = createFeatures([]);
    const requiredInputStub = sinon.stub(actionsUtil, "getRequiredInput");
    requiredInputStub.withArgs("analysis-kinds").returns("no-such-thing");
-    await t.throwsAsync(getAnalysisKinds(getRunnerLogger(true), true));
+    await t.throwsAsync(
+      getAnalysisKinds(getRunnerLogger(true), features, true),
+    );
  },
 );

@@ -98,11 +173,18 @@ for (let i = 0; i < analysisKinds.length; i++) {
      test.serial(
        `getAnalysisKinds - allows ${analysisKind} with ${otherAnalysis}`,
        async (t) => {
+          setupBaseActionsVars();
+          process.env[EnvVar.TEST_MODE] = "true";
+          const features = createFeatures([]);
          const requiredInputStub = sinon.stub(actionsUtil, "getRequiredInput");
          requiredInputStub
            .withArgs("analysis-kinds")
            .returns([analysisKind, otherAnalysis].join(","));
-          const result = await getAnalysisKinds(getRunnerLogger(true), true);
+          const result = await getAnalysisKinds(
+            getRunnerLogger(true),
+            features,
+            true,
+          );
          t.is(result.length, 2);
        },
      );
@@ -110,14 +192,19 @@ for (let i = 0; i < analysisKinds.length; i++) {
      test.serial(
        `getAnalysisKinds - throws if ${analysisKind} is enabled with ${otherAnalysis}`,
        async (t) => {
+          setupBaseActionsVars();
+          const features = createFeatures([]);
          const requiredInputStub = sinon.stub(actionsUtil, "getRequiredInput");
          requiredInputStub
            .withArgs("analysis-kinds")
            .returns([analysisKind, otherAnalysis].join(","));
-          await t.throwsAsync(getAnalysisKinds(getRunnerLogger(true), true), {
-            instanceOf: ConfigurationError,
-            message: `${analysisKind} and ${otherAnalysis} cannot be enabled at the same time`,
-          });
+          await t.throwsAsync(
+            getAnalysisKinds(getRunnerLogger(true), features, true),
+            {
+              instanceOf: ConfigurationError,
+              message: `${analysisKind} and ${otherAnalysis} cannot be enabled at the same time`,
+            },
+          );
        },
      );
    }
@@ -2,15 +2,17 @@ import {
  fixCodeQualityCategory,
  getOptionalInput,
  getRequiredInput,
+  isDynamicWorkflow,
 } from "./actions-util";
 import { EnvVar } from "./environment";
+import { Feature, FeatureEnablement } from "./feature-flags";
 import { Logger } from "./logging";
 import {
  AssessmentPayload,
  BasePayload,
  UploadPayload,
 } from "./upload-lib/types";
-import { ConfigurationError, getRequiredEnvParam } from "./util";
+import { ConfigurationError, getRequiredEnvParam, isInTestMode } from "./util";

 export enum AnalysisKind {
  CodeScanning = "code-scanning",
@@ -64,6 +66,21 @@ export async function parseAnalysisKinds(
 // Used to avoid re-parsing the input after we have done it once.
 let cachedAnalysisKinds: AnalysisKind[] | undefined;

+/** Determines whether `code-scanning` is the only enabled analysis kind in `analysisKinds`. */
+function isOnlyCodeScanningEnabled(analysisKinds: AnalysisKind[]) {
+  return (
+    analysisKinds.length === 1 && analysisKinds[0] === AnalysisKind.CodeScanning
+  );
+}
+
+/** Prepends a generic message about the intended usage for `analysis-kinds` to `message`. */
+function makeAnalysisKindUsageError(message: string) {
+  return (
+    "The `analysis-kinds` input is experimental and for GitHub-internal use only. " +
+    `Its behaviour may change at any time or be removed entirely. ${message}`
+  );
+}
+
 /**
 * Initialises the analysis kinds for the analysis based on the `analysis-kinds` input.
 * This function will also use the deprecated `quality-queries` input as an indicator to enable `code-quality`.
@@ -77,6 +94,7 @@ let cachedAnalysisKinds: AnalysisKind[] | undefined;
 */
 export async function getAnalysisKinds(
  logger: Logger,
+  features: FeatureEnablement,
  skipCache: boolean = false,
 ): Promise<AnalysisKind[]> {
  if (!skipCache && cachedAnalysisKinds !== undefined) {
@@ -87,6 +105,26 @@ export async function getAnalysisKinds(
    getRequiredInput("analysis-kinds"),
  );

+  // Log an error if we are outside of a GitHub-managed workflow and an analysis kind
+  // other than `code-scanning` is enabled.
+  if (
+    !isInTestMode() &&
+    !isDynamicWorkflow() &&
+    !isOnlyCodeScanningEnabled(analysisKinds)
+  ) {
+    const codeQualityHint = analysisKinds.includes(AnalysisKind.CodeQuality)
+      ? " If your intention is to use quality queries outside of Code Quality, " +
+        "use the `queries` input with `code-quality` instead."
+      : "";
+
+    logger.error(
+      makeAnalysisKindUsageError(
+        "An analysis kind other than `code-scanning` was specified in a custom workflow. " +
+          `This is not supported and will become a fatal error in a future version of the CodeQL Action.${codeQualityHint}`,
+      ),
+    );
+  }
+
  // Warn that `quality-queries` is deprecated if there is an argument for it.
  const qualityQueriesInput = getOptionalInput("quality-queries");

@@ -120,6 +158,25 @@ export async function getAnalysisKinds(
    }
  }

+  // Log an error if we have multiple inputs for `analysis-kinds` outside of test mode,
+  // and enable only `code-scanning`.
+  if (
+    !isInTestMode() &&
+    analysisKinds.length > 1 &&
+    !(await features.getValue(Feature.AllowMultipleAnalysisKinds))
+  ) {
+    logger.error(
+      makeAnalysisKindUsageError(
+        "Specifying multiple values as input is no longer supported. " +
+          "Continuing with only `analysis-kinds: code-scanning`.",
+      ),
+    );
+
+    // Only enable Code Scanning.
+    cachedAnalysisKinds = [AnalysisKind.CodeScanning];
+    return cachedAnalysisKinds;
+  }
+
  // Cache the analysis kinds and return them.
  cachedAnalysisKinds = analysisKinds;
  return cachedAnalysisKinds;
@@ -1,90 +0,0 @@
-import test from "ava";
-import * as sinon from "sinon";
-
-import * as actionsUtil from "./actions-util";
-import * as analyze from "./analyze";
-import * as api from "./api-client";
-import * as configUtils from "./config-utils";
-import * as gitUtils from "./git-utils";
-import * as statusReport from "./status-report";
-import {
-  setupTests,
-  setupActionsVars,
-  mockFeatureFlagApiEndpoint,
-} from "./testing-utils";
-import * as util from "./util";
-
-setupTests(test);
-
-// This test needs to be in its own file so that ava would run it in its own
-// nodejs process. The code being tested is in analyze-action.ts, which runs
-// immediately on load. So the file needs to be loaded during part of the test,
-// and that can happen only once per nodejs process. If multiple such tests are
-// in the same test file, ava would run them in the same nodejs process, and all
-// but the first test would fail.
-
-test("analyze action with RAM & threads from environment variables", async (t) => {
-  // This test frequently times out on Windows with the default timeout, so we bump
-  // it a bit to 20s.
-  t.timeout(1000 * 20);
-  await util.withTmpDir(async (tmpDir) => {
-    setupActionsVars(tmpDir, tmpDir);
-    sinon
-      .stub(statusReport, "createStatusReportBase")
-      .resolves({} as statusReport.StatusReportBase);
-    sinon.stub(statusReport, "sendStatusReport").resolves();
-    sinon.stub(gitUtils, "isAnalyzingDefaultBranch").resolves(true);
-
-    const gitHubVersion: util.GitHubVersion = {
-      type: util.GitHubVariant.DOTCOM,
-    };
-    sinon.stub(configUtils, "getConfig").resolves({
-      gitHubVersion,
-      augmentationProperties: {},
-      languages: [],
-      packs: [],
-      trapCaches: {},
-    } as unknown as configUtils.Config);
-    const requiredInputStub = sinon.stub(actionsUtil, "getRequiredInput");
-    requiredInputStub.withArgs("token").returns("fake-token");
-    requiredInputStub.withArgs("upload-database").returns("false");
-    requiredInputStub.withArgs("output").returns("out");
-    const optionalInputStub = sinon.stub(actionsUtil, "getOptionalInput");
-    optionalInputStub.withArgs("expect-error").returns("false");
-    sinon.stub(api, "getGitHubVersion").resolves(gitHubVersion);
-    mockFeatureFlagApiEndpoint(200, {});
-
-    // When there are no action inputs for RAM and threads, the action uses
-    // environment variables (passed down from the init action) to set RAM and
-    // threads usage.
-    process.env["CODEQL_THREADS"] = "-1";
-    process.env["CODEQL_RAM"] = "4992";
-
-    const runFinalizeStub = sinon.stub(analyze, "runFinalize");
-    const runQueriesStub = sinon.stub(analyze, "runQueries");
-    // eslint-disable-next-line @typescript-eslint/no-require-imports
-    const analyzeAction = require("./analyze-action");
-
-    // When analyze-action.ts loads, it runs an async function from the top
-    // level but does not wait for it to finish. To ensure that calls to
-    // runFinalize and runQueries are correctly captured by spies, we explicitly
-    // wait for the action promise to complete before starting verification.
-    await analyzeAction.runPromise;
-
-    t.assert(
-      runFinalizeStub.calledOnceWith(
-        sinon.match.any,
-        sinon.match.any,
-        "--threads=-1",
-        "--ram=4992",
-      ),
-    );
-    t.assert(
-      runQueriesStub.calledOnceWith(
-        sinon.match.any,
-        "--ram=4992",
-        "--threads=-1",
-      ),
-    );
-  });
-});
@@ -1,88 +0,0 @@
-import test from "ava";
-import * as sinon from "sinon";
-
-import * as actionsUtil from "./actions-util";
-import * as analyze from "./analyze";
-import * as api from "./api-client";
-import * as configUtils from "./config-utils";
-import * as gitUtils from "./git-utils";
-import * as statusReport from "./status-report";
-import {
-  setupTests,
-  setupActionsVars,
-  mockFeatureFlagApiEndpoint,
-} from "./testing-utils";
-import * as util from "./util";
-
-setupTests(test);
-
-// This test needs to be in its own file so that ava would run it in its own
-// nodejs process. The code being tested is in analyze-action.ts, which runs
-// immediately on load. So the file needs to be loaded during part of the test,
-// and that can happen only once per nodejs process. If multiple such tests are
-// in the same test file, ava would run them in the same nodejs process, and all
-// but the first test would fail.
-
-test("analyze action with RAM & threads from action inputs", async (t) => {
-  t.timeout(1000 * 20);
-  await util.withTmpDir(async (tmpDir) => {
-    setupActionsVars(tmpDir, tmpDir);
-    sinon
-      .stub(statusReport, "createStatusReportBase")
-      .resolves({} as statusReport.StatusReportBase);
-    sinon.stub(statusReport, "sendStatusReport").resolves();
-    const gitHubVersion: util.GitHubVersion = {
-      type: util.GitHubVariant.DOTCOM,
-    };
-    sinon.stub(configUtils, "getConfig").resolves({
-      gitHubVersion,
-      augmentationProperties: {},
-      languages: [],
-      packs: [],
-      trapCaches: {},
-    } as unknown as configUtils.Config);
-    const requiredInputStub = sinon.stub(actionsUtil, "getRequiredInput");
-    requiredInputStub.withArgs("token").returns("fake-token");
-    requiredInputStub.withArgs("upload-database").returns("false");
-    requiredInputStub.withArgs("output").returns("out");
-    const optionalInputStub = sinon.stub(actionsUtil, "getOptionalInput");
-    optionalInputStub.withArgs("expect-error").returns("false");
-    sinon.stub(api, "getGitHubVersion").resolves(gitHubVersion);
-    sinon.stub(gitUtils, "isAnalyzingDefaultBranch").resolves(true);
-    mockFeatureFlagApiEndpoint(200, {});
-
-    process.env["CODEQL_THREADS"] = "1";
-    process.env["CODEQL_RAM"] = "4992";
-
-    // Action inputs have precedence over environment variables.
-    optionalInputStub.withArgs("threads").returns("-1");
-    optionalInputStub.withArgs("ram").returns("3012");
-
-    const runFinalizeStub = sinon.stub(analyze, "runFinalize");
-    const runQueriesStub = sinon.stub(analyze, "runQueries");
-    // eslint-disable-next-line @typescript-eslint/no-require-imports
-    const analyzeAction = require("./analyze-action");
-
-    // When analyze-action.ts loads, it runs an async function from the top
-    // level but does not wait for it to finish. To ensure that calls to
-    // runFinalize and runQueries are correctly captured by spies, we explicitly
-    // wait for the action promise to complete before starting verification.
-    await analyzeAction.runPromise;
-
-    t.assert(
-      runFinalizeStub.calledOnceWith(
-        sinon.match.any,
-        sinon.match.any,
-        "--threads=-1",
-        "--ram=3012",
-      ),
-    );
-    t.assert(
-      runQueriesStub.calledOnceWith(
-        sinon.match.any,
-        "--ram=3012",
-        "--threads=-1",
-      ),
-    );
-  });
-});
@@ -20,7 +20,7 @@ import { EnvVar } from "./environment";
 import { getActionsLogger } from "./logging";
 import { checkGitHubVersionInRange, getErrorMessage } from "./util";

-async function runWrapper() {
+export async function runWrapper() {
  // To capture errors appropriately, keep as much code within the try-catch as
  // possible, and only use safe functions outside.

@@ -72,5 +72,3 @@ async function runWrapper() {
    );
  }
 }
-
-void runWrapper();
@@ -0,0 +1,142 @@
+import test from "ava";
+import * as sinon from "sinon";
+
+import * as actionsUtil from "./actions-util";
+import * as analyze from "./analyze";
+import { runWrapper } from "./analyze-action";
+import * as api from "./api-client";
+import * as configUtils from "./config-utils";
+import * as gitUtils from "./git-utils";
+import * as statusReport from "./status-report";
+import {
+  setupTests,
+  setupActionsVars,
+  mockFeatureFlagApiEndpoint,
+} from "./testing-utils";
+import * as util from "./util";
+
+setupTests(test);
+
+test.serial(
+  "analyze action with RAM & threads from environment variables",
+  async (t) => {
+    // This test frequently times out on Windows with the default timeout, so we bump
+    // it a bit to 20s.
+    t.timeout(1000 * 20);
+    await util.withTmpDir(async (tmpDir) => {
+      setupActionsVars(tmpDir, tmpDir);
+      sinon
+        .stub(statusReport, "createStatusReportBase")
+        .resolves({} as statusReport.StatusReportBase);
+      sinon.stub(statusReport, "sendStatusReport").resolves();
+      sinon.stub(gitUtils, "isAnalyzingDefaultBranch").resolves(true);
+
+      const gitHubVersion: util.GitHubVersion = {
+        type: util.GitHubVariant.DOTCOM,
+      };
+      sinon.stub(configUtils, "getConfig").resolves({
+        gitHubVersion,
+        augmentationProperties: {},
+        languages: [],
+        packs: [],
+        trapCaches: {},
+      } as unknown as configUtils.Config);
+      const requiredInputStub = sinon.stub(actionsUtil, "getRequiredInput");
+      requiredInputStub.withArgs("token").returns("fake-token");
+      requiredInputStub.withArgs("upload-database").returns("false");
+      requiredInputStub.withArgs("output").returns("out");
+      const optionalInputStub = sinon.stub(actionsUtil, "getOptionalInput");
+      optionalInputStub.withArgs("expect-error").returns("false");
+      sinon.stub(api, "getGitHubVersion").resolves(gitHubVersion);
+      mockFeatureFlagApiEndpoint(200, {});
+
+      // When there are no action inputs for RAM and threads, the action uses
+      // environment variables (passed down from the init action) to set RAM and
+      // threads usage.
+      process.env["CODEQL_THREADS"] = "-1";
+      process.env["CODEQL_RAM"] = "4992";
+
+      const runFinalizeStub = sinon.stub(analyze, "runFinalize");
+      const runQueriesStub = sinon.stub(analyze, "runQueries");
+
+      await runWrapper();
+
+      t.assert(
+        runFinalizeStub.calledOnceWith(
+          sinon.match.any,
+          sinon.match.any,
+          "--threads=-1",
+          "--ram=4992",
+        ),
+      );
+      t.assert(
+        runQueriesStub.calledOnceWith(
+          sinon.match.any,
+          "--ram=4992",
+          "--threads=-1",
+        ),
+      );
+    });
+  },
+);
+
+test.serial(
+  "analyze action with RAM & threads from action inputs",
+  async (t) => {
+    t.timeout(1000 * 20);
+    await util.withTmpDir(async (tmpDir) => {
+      setupActionsVars(tmpDir, tmpDir);
+      sinon
+        .stub(statusReport, "createStatusReportBase")
+        .resolves({} as statusReport.StatusReportBase);
+      sinon.stub(statusReport, "sendStatusReport").resolves();
+      const gitHubVersion: util.GitHubVersion = {
+        type: util.GitHubVariant.DOTCOM,
+      };
+      sinon.stub(configUtils, "getConfig").resolves({
+        gitHubVersion,
+        augmentationProperties: {},
+        languages: [],
+        packs: [],
+        trapCaches: {},
+      } as unknown as configUtils.Config);
+      const requiredInputStub = sinon.stub(actionsUtil, "getRequiredInput");
+      requiredInputStub.withArgs("token").returns("fake-token");
+      requiredInputStub.withArgs("upload-database").returns("false");
+      requiredInputStub.withArgs("output").returns("out");
+      const optionalInputStub = sinon.stub(actionsUtil, "getOptionalInput");
+      optionalInputStub.withArgs("expect-error").returns("false");
+      sinon.stub(api, "getGitHubVersion").resolves(gitHubVersion);
+      sinon.stub(gitUtils, "isAnalyzingDefaultBranch").resolves(true);
+      mockFeatureFlagApiEndpoint(200, {});
+
+      process.env["CODEQL_THREADS"] = "1";
+      process.env["CODEQL_RAM"] = "4992";
+
+      // Action inputs have precedence over environment variables.
+      optionalInputStub.withArgs("threads").returns("-1");
+      optionalInputStub.withArgs("ram").returns("3012");
+
+      const runFinalizeStub = sinon.stub(analyze, "runFinalize");
+      const runQueriesStub = sinon.stub(analyze, "runQueries");
+
+      await runWrapper();
+
+      t.assert(
+        runFinalizeStub.calledOnceWith(
+          sinon.match.any,
+          sinon.match.any,
+          "--threads=-1",
+          "--ram=3012",
+        ),
+      );
+      t.assert(
+        runQueriesStub.calledOnceWith(
+          sinon.match.any,
+          "--ram=3012",
+          "--threads=-1",
+        ),
+      );
+    });
+  },
+);
@@ -523,14 +523,11 @@ async function run(startedAt: Date) {
  }
 }

-// Module-level startedAt so it can be accessed by runWrapper for error reporting
-const startedAt = new Date();
-export const runPromise = run(startedAt);
-
-async function runWrapper() {
+export async function runWrapper() {
+  const startedAt = new Date();
  const logger = getActionsLogger();
  try {
-    await runPromise;
+    await run(startedAt);
  } catch (error) {
    core.setFailed(`analyze action failed: ${util.getErrorMessage(error)}`);
    await sendUnhandledErrorStatusReport(
@@ -542,5 +539,3 @@ async function runWrapper() {
  }
  await util.checkForTimeout();
 }
-
-void runWrapper();
@@ -128,6 +128,8 @@ export async function getGitHubVersionFromApi(

  // Doesn't strictly have to be the meta endpoint as we're only
  // using the response headers which are available on every request.
+  //
+  // See https://docs.github.com/en/rest/meta/meta#get-github-meta-information.
  // eslint-disable-next-line @typescript-eslint/no-unsafe-call
  const response = await apiClient.rest.meta.get();

@@ -164,6 +166,9 @@ export async function getGitHubVersion(): Promise<GitHubVersion> {

 /**
 * Get the path of the currently executing workflow relative to the repository root.
+ *
+ * See https://docs.github.com/en/rest/actions/workflow-runs#get-a-workflow-run
+ * and https://docs.github.com/en/rest/actions/workflows#get-a-workflow.
 */
 export async function getWorkflowRelativePath(): Promise<string> {
  const repo_nwo = getRepositoryNwo();
@@ -252,9 +257,13 @@ export interface ActionsCacheItem {
  size_in_bytes?: number;
 }

-/** List all Actions cache entries matching the provided key and ref. */
+/**
+ * List all Actions cache entries starting with the provided key prefix and matching the provided ref.
+ *
+ * See https://docs.github.com/en/rest/actions/cache#list-github-actions-caches-for-a-repository.
+ */
 export async function listActionsCaches(
-  key: string,
+  keyPrefix: string,
  ref?: string,
 ): Promise<ActionsCacheItem[]> {
  const repositoryNwo = getRepositoryNwo();
@@ -264,13 +273,17 @@ export async function listActionsCaches(
    {
      owner: repositoryNwo.owner,
      repo: repositoryNwo.repo,
-      key,
+      key: keyPrefix,
      ref,
    },
  );
 }

-/** Delete an Actions cache item by its ID. */
+/**
+ * Delete an Actions cache item by its ID.
+ *
+ * See https://docs.github.com/en/rest/actions/cache#delete-a-github-actions-cache-for-a-repository-using-a-cache-id.
+ */
 export async function deleteActionsCache(id: number) {
  const repositoryNwo = getRepositoryNwo();

@@ -281,7 +294,11 @@ export async function deleteActionsCache(id: number) {
  });
 }

-/** Retrieve all custom repository properties. */
+/**
+ * Retrieve all custom repository properties.
+ *
+ * See https://docs.github.com/en/rest/repos/custom-properties#get-all-custom-property-values-for-a-repository.
+ */
 export async function getRepositoryProperties(repositoryNwo: RepositoryNwo) {
  return getApiClient().request("GET /repos/:owner/:repo/properties/values", {
    owner: repositoryNwo.owner,
@@ -141,9 +141,9 @@ test("scanArtifactsForTokens handles files without tokens", async (t) => {
  }
 });

+// `scanArchiveFile` does not support Windows, so we skip this test there.
 if (os.platform() !== "win32") {
  test("scanArtifactsForTokens finds token in debug artifacts", async (t) => {
-    t.timeout(15000); // 15 seconds
    const messages: LoggedMessage[] = [];
    const logger = getRecordingLogger(messages, { logToConsole: false });
    // The zip here is a regression test based on
@@ -156,6 +156,10 @@ async function scanArchiveFile(
    );
  }

+  if (process.platform === "win32") {
+    throw new Error("Scanning archives is not supported on Windows.");
+  }
+
  const result: ScanResult = {
    scannedFiles: 0,
    findings: [],
@@ -142,7 +142,7 @@ async function run(startedAt: Date) {
  await sendCompletedStatusReport(config, logger, startedAt, languages ?? []);
 }

-async function runWrapper() {
+export async function runWrapper() {
  const startedAt = new Date();
  const logger = getActionsLogger();
  try {
@@ -157,5 +157,3 @@ async function runWrapper() {
    );
  }
 }
-
-void runWrapper();
@@ -33,6 +33,7 @@ import {
  mockBundleDownloadApi,
  makeVersionInfo,
  createTestConfig,
+  makeMacro,
 } from "./testing-utils";
 import { ToolsDownloadStatusReport } from "./tools-download";
 import * as util from "./util";
@@ -70,8 +71,10 @@ async function installIntoToolcache({
    tmpDir,
    util.GitHubVariant.GHES,
    cliVersion !== undefined
-      ? { cliVersion, tagName }
+      ? { enabledVersions: [{ cliVersion, tagName }] }
      : SAMPLE_DEFAULT_CLI_VERSION,
+    undefined, // rawLanguages
+    false, // useOverlayAwareDefaultCliVersion
    createFeatures([]),
    getRunnerLogger(true),
    false,
@@ -143,6 +146,8 @@ test.serial(
          tmpDir,
          util.GitHubVariant.DOTCOM,
          SAMPLE_DEFAULT_CLI_VERSION,
+          undefined, // rawLanguages
+          false, // useOverlayAwareDefaultCliVersion
          features,
          getRunnerLogger(true),
          false,
@@ -175,6 +180,8 @@ test.serial(
        tmpDir,
        util.GitHubVariant.DOTCOM,
        SAMPLE_DEFAULT_CLI_VERSION,
+        undefined, // rawLanguages
+        false, // useOverlayAwareDefaultCliVersion
        features,
        getRunnerLogger(true),
        false,
@@ -214,6 +221,8 @@ test.serial(
        tmpDir,
        util.GitHubVariant.DOTCOM,
        SAMPLE_DEFAULT_CLI_VERSION,
+        undefined, // rawLanguages
+        false, // useOverlayAwareDefaultCliVersion
        features,
        getRunnerLogger(true),
        false,
@@ -264,6 +273,8 @@ for (const {
          tmpDir,
          util.GitHubVariant.DOTCOM,
          SAMPLE_DEFAULT_CLI_VERSION,
+          undefined, // rawLanguages
+          false, // useOverlayAwareDefaultCliVersion
          features,
          getRunnerLogger(true),
          false,
@@ -284,11 +295,11 @@ for (const {
 for (const toolcacheVersion of [
  // Test that we use the tools from the toolcache when `SAMPLE_DEFAULT_CLI_VERSION` is requested
  // and `SAMPLE_DEFAULT_CLI_VERSION-` is in the toolcache.
-  SAMPLE_DEFAULT_CLI_VERSION.cliVersion,
-  `${SAMPLE_DEFAULT_CLI_VERSION.cliVersion}-20230101`,
+  SAMPLE_DEFAULT_CLI_VERSION.enabledVersions[0].cliVersion,
+  `${SAMPLE_DEFAULT_CLI_VERSION.enabledVersions[0].cliVersion}-20230101`,
 ]) {
  test.serial(
-    `uses tools from toolcache when ${SAMPLE_DEFAULT_CLI_VERSION.cliVersion} is requested and ` +
+    `uses tools from toolcache when ${SAMPLE_DEFAULT_CLI_VERSION.enabledVersions[0].cliVersion} is requested and ` +
      `${toolcacheVersion} is installed`,
    async (t) => {
      const features = createFeatures([]);
@@ -308,11 +319,16 @@ for (const toolcacheVersion of [
          tmpDir,
          util.GitHubVariant.DOTCOM,
          SAMPLE_DEFAULT_CLI_VERSION,
+          undefined, // rawLanguages
+          false, // useOverlayAwareDefaultCliVersion
          features,
          getRunnerLogger(true),
          false,
        );
-        t.is(result.toolsVersion, SAMPLE_DEFAULT_CLI_VERSION.cliVersion);
+        t.is(
+          result.toolsVersion,
+          SAMPLE_DEFAULT_CLI_VERSION.enabledVersions[0].cliVersion,
+        );
        t.is(result.toolsSource, ToolsSource.Toolcache);
        t.is(result.toolsDownloadStatusReport?.combinedDurationMs, undefined);
        t.is(result.toolsDownloadStatusReport?.downloadDurationMs, undefined);
@@ -342,9 +358,15 @@ test.serial(
        tmpDir,
        util.GitHubVariant.GHES,
        {
-          cliVersion: defaults.cliVersion,
-          tagName: defaults.bundleVersion,
+          enabledVersions: [
+            {
+              cliVersion: defaults.cliVersion,
+              tagName: defaults.bundleVersion,
+            },
+          ],
        },
+        undefined, // rawLanguages
+        false, // useOverlayAwareDefaultCliVersion
        features,
        getRunnerLogger(true),
        false,
@@ -384,9 +406,15 @@ test.serial(
        tmpDir,
        util.GitHubVariant.GHES,
        {
-          cliVersion: defaults.cliVersion,
-          tagName: defaults.bundleVersion,
+          enabledVersions: [
+            {
+              cliVersion: defaults.cliVersion,
+              tagName: defaults.bundleVersion,
+            },
+          ],
        },
+        undefined, // rawLanguages
+        false, // useOverlayAwareDefaultCliVersion
        features,
        getRunnerLogger(true),
        false,
@@ -426,6 +454,8 @@ test.serial(
        tmpDir,
        util.GitHubVariant.DOTCOM,
        SAMPLE_DEFAULT_CLI_VERSION,
+        undefined, // rawLanguages
+        false, // useOverlayAwareDefaultCliVersion
        features,
        getRunnerLogger(true),
        false,
@@ -467,6 +497,8 @@ test.serial(
        tmpDir,
        util.GitHubVariant.DOTCOM,
        SAMPLE_DEFAULT_CLI_VERSION,
+        undefined, // rawLanguages
+        false, // useOverlayAwareDefaultCliVersion
        features,
        getRunnerLogger(true),
        false,
@@ -540,7 +572,7 @@ test.serial("getExtraOptions throws for bad content", (t) => {
 });

 // Test macro for ensuring different variants of injected augmented configurations
-const injectedConfigMacro = test.macro({
+const injectedConfigMacro = makeMacro({
  exec: async (
    t: ExecutionContext<unknown>,
    augmentationProperties: AugmentationProperties,
@@ -590,9 +622,8 @@ const injectedConfigMacro = test.macro({
    `databaseInitCluster() injected config: ${providedTitle}`,
 });

-test.serial(
+injectedConfigMacro.serial(
  "basic",
-  injectedConfigMacro,
  {
    ...defaultAugmentationProperties,
  },
@@ -600,9 +631,8 @@ test.serial(
  {},
 );

-test.serial(
+injectedConfigMacro.serial(
  "injected packs from input",
-  injectedConfigMacro,
  {
    ...defaultAugmentationProperties,
    packsInput: ["xxx", "yyy"],
@@ -613,9 +643,8 @@ test.serial(
  },
 );

-test.serial(
+injectedConfigMacro.serial(
  "injected packs from input with existing packs combines",
-  injectedConfigMacro,
  {
    ...defaultAugmentationProperties,
    packsInputCombines: true,
@@ -635,9 +664,8 @@ test.serial(
  },
 );

-test.serial(
+injectedConfigMacro.serial(
  "injected packs from input with existing packs overrides",
-  injectedConfigMacro,
  {
    ...defaultAugmentationProperties,
    packsInput: ["xxx", "yyy"],
@@ -655,9 +683,8 @@ test.serial(
 );

 // similar, but with queries
-test.serial(
+injectedConfigMacro.serial(
  "injected queries from input",
-  injectedConfigMacro,
  {
    ...defaultAugmentationProperties,
    queriesInput: [{ uses: "xxx" }, { uses: "yyy" }],
@@ -675,9 +702,8 @@ test.serial(
  },
 );

-test.serial(
+injectedConfigMacro.serial(
  "injected queries from input overrides",
-  injectedConfigMacro,
  {
    ...defaultAugmentationProperties,
    queriesInput: [{ uses: "xxx" }, { uses: "yyy" }],
@@ -699,9 +725,8 @@ test.serial(
  },
 );

-test.serial(
+injectedConfigMacro.serial(
  "injected queries from input combines",
-  injectedConfigMacro,
  {
    ...defaultAugmentationProperties,
    queriesInputCombines: true,
@@ -727,9 +752,8 @@ test.serial(
  },
 );

-test.serial(
+injectedConfigMacro.serial(
  "injected queries from input combines 2",
-  injectedConfigMacro,
  {
    ...defaultAugmentationProperties,
    queriesInputCombines: true,
@@ -749,9 +773,8 @@ test.serial(
  },
 );

-test.serial(
+injectedConfigMacro.serial(
  "injected queries and packs, but empty",
-  injectedConfigMacro,
  {
    ...defaultAugmentationProperties,
    queriesInputCombines: true,
@@ -768,9 +791,8 @@ test.serial(
  {},
 );

-test.serial(
+injectedConfigMacro.serial(
  "repo property queries have the highest precedence",
-  injectedConfigMacro,
  {
    ...defaultAugmentationProperties,
    queriesInputCombines: true,
@@ -790,9 +812,8 @@ test.serial(
  },
 );

-test.serial(
+injectedConfigMacro.serial(
  "repo property queries combines with queries input",
-  injectedConfigMacro,
  {
    ...defaultAugmentationProperties,
    queriesInputCombines: false,
@@ -817,9 +838,8 @@ test.serial(
  },
 );

-test.serial(
+injectedConfigMacro.serial(
  "repo property queries combines everything else",
-  injectedConfigMacro,
  {
    ...defaultAugmentationProperties,
    queriesInputCombines: true,
@@ -1052,7 +1072,7 @@ test.serial(
 );

 test.serial(
-  "Avoids duplicating --overwrite flag if specified in CODEQL_ACTION_EXTRA_OPTIONS",
+  "Avoids duplicating --force-overwrite flag if specified in CODEQL_ACTION_EXTRA_OPTIONS",
  async (t) => {
    const runnerConstructorStub = stubToolRunnerConstructor();
    const codeqlObject = await stubCodeql();
@@ -1060,7 +1080,7 @@ test.serial(
    sinon.stub(io, "which").resolves("");

    process.env["CODEQL_ACTION_EXTRA_OPTIONS"] =
-      '{ "database": { "init": ["--overwrite"] } }';
+      '{ "database": { "init": ["--force-overwrite"] } }';

    await codeqlObject.databaseInitCluster(
      stubConfig,
@@ -1073,9 +1093,9 @@ test.serial(
    t.true(runnerConstructorStub.calledOnce);
    const args = runnerConstructorStub.firstCall.args[1] as string[];
    t.is(
-      args.filter((option: string) => option === "--overwrite").length,
+      args.filter((option: string) => option === "--force-overwrite").length,
      1,
-      "--overwrite should only be passed once",
+      "--force-overwrite should only be passed once",
    );

    // Clean up
@@ -277,7 +277,7 @@ let cachedCodeQL: CodeQL | undefined = undefined;
 * The version flags below can be used to conditionally enable certain features
 * on versions newer than this.
 */
-const CODEQL_MINIMUM_VERSION = "2.17.6";
+const CODEQL_MINIMUM_VERSION = "2.19.4";

 /**
 * This version will shortly become the oldest version of CodeQL that the Action will run with.
@@ -305,6 +305,8 @@ const EXTRACTION_DEBUG_MODE_VERBOSITY = "progress++";
 * @param tempDir
 * @param variant
 * @param defaultCliVersion
+ * @param rawLanguages Raw set of languages.
+ * @param useOverlayAwareDefaultCliVersion Whether to select an overlay-aware default CLI version.
 * @param features Information about the features that are enabled.
 * @param logger
 * @param checkVersion Whether to check that CodeQL CLI meets the minimum
@@ -317,6 +319,8 @@ export async function setupCodeQL(
  tempDir: string,
  variant: util.GitHubVariant,
  defaultCliVersion: CodeQLDefaultVersionInfo,
+  rawLanguages: string[] | undefined,
+  useOverlayAwareDefaultCliVersion: boolean,
  features: FeatureEnablement,
  logger: Logger,
  checkVersion: boolean,
@@ -340,6 +344,8 @@ export async function setupCodeQL(
      tempDir,
      variant,
      defaultCliVersion,
+      rawLanguages,
+      useOverlayAwareDefaultCliVersion,
      features,
      logger,
    );
@@ -586,13 +592,6 @@ async function getCodeQLForCmd(
        extraArgs.push(`--qlconfig-file=${qlconfigFile}`);
      }

-      const overwriteFlag = isSupportedToolsFeature(
-        await this.getVersion(),
-        ToolsFeature.ForceOverwrite,
-      )
-        ? "--force-overwrite"
-        : "--overwrite";
-
      const overlayDatabaseMode = config.overlayDatabaseMode;
      if (overlayDatabaseMode === OverlayDatabaseMode.Overlay) {
        const overlayChangesFile = await writeOverlayChangesFile(
@@ -619,7 +618,7 @@ async function getCodeQLForCmd(
          "init",
          ...(overlayDatabaseMode === OverlayDatabaseMode.Overlay
            ? []
-            : [overwriteFlag]),
+            : ["--force-overwrite"]),
          "--db-cluster",
          config.dbLocation,
          `--source-root=${sourceRoot}`,
@@ -630,7 +629,14 @@ async function getCodeQLForCmd(
            // Some user configs specify `--no-calculate-baseline` as an additional
            // argument to `codeql database init`. Therefore ignore the baseline file
            // options here to avoid specifying the same argument twice and erroring.
-            ignoringOptions: ["--overwrite", ...baselineFilesOptions],
+            //
+            // Ignore `--overwrite` to avoid passing both `--force-overwrite` and `--overwrite` if
+            // the user has configured `--overwrite`.
+            ignoringOptions: [
+              "--force-overwrite",
+              "--overwrite",
+              ...baselineFilesOptions,
+            ],
          }),
        ],
        { stdin: externalRepositoryToken },
@@ -847,7 +853,7 @@ async function getCodeQLForCmd(
        "--sarif-group-rules-by-pack",
        "--sarif-include-query-help=always",
        "--sublanguage-file-coverage",
-        ...(await getJobRunUuidSarifOptions(this)),
+        ...(await getJobRunUuidSarifOptions()),
        ...getExtraOptionsFromEnv(["database", "interpret-results"]),
      ];
      if (sarifRunPropertyFlag !== undefined) {
@@ -1277,13 +1283,8 @@ function applyAutobuildAzurePipelinesTimeoutFix() {
  ].join(" ");
 }

-async function getJobRunUuidSarifOptions(codeql: CodeQL) {
+async function getJobRunUuidSarifOptions() {
  const jobRunUuid = process.env[EnvVar.JOB_RUN_UUID];

-  return jobRunUuid &&
-    (await codeql.supportsFeature(
-      ToolsFeature.DatabaseInterpretResultsSupportsSarifRunProperty,
-    ))
-    ? [`--sarif-run-property=jobRunUuid=${jobRunUuid}`]
-    : [];
+  return jobRunUuid ? [`--sarif-run-property=jobRunUuid=${jobRunUuid}`] : [];
 }
@@ -21,6 +21,7 @@ import { GitVersionInfo } from "./git-utils";
 import { BuiltInLanguage, Language } from "./languages";
 import { getRunnerLogger } from "./logging";
 import { CODEQL_OVERLAY_MINIMUM_VERSION } from "./overlay";
+import * as overlayDiagnostics from "./overlay/diagnostics";
 import { OverlayDisabledReason } from "./overlay/diagnostics";
 import { OverlayDatabaseMode } from "./overlay/overlay-database-mode";
 import * as overlayStatus from "./overlay/status";
@@ -34,6 +35,7 @@ import {
  LoggedMessage,
  mockCodeQLVersion,
  createTestConfig,
+  makeMacro,
 } from "./testing-utils";
 import {
  GitHubVariant,
@@ -1034,10 +1036,9 @@ const defaultOverlayDatabaseModeTestSetup: OverlayDatabaseModeTestSetup = {
  repositoryProperties: {},
 };

-const checkOverlayEnablementMacro = test.macro({
+const checkOverlayEnablementMacro = makeMacro({
  exec: async (
    t: ExecutionContext,
-    _title: string,
    setupOverrides: Partial<OverlayDatabaseModeTestSetup>,
    expected:
      | {
@@ -1131,11 +1132,10 @@ const checkOverlayEnablementMacro = test.macro({
      }
    });
  },
-  title: (_, title) => `checkOverlayEnablement: ${title}`,
+  title: (title) => `checkOverlayEnablement: ${title}`,
 });

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "Environment variable override - Overlay",
  {
    overlayDatabaseEnvVar: "overlay",
@@ -1146,8 +1146,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "Environment variable override - OverlayBase",
  {
    overlayDatabaseEnvVar: "overlay-base",
@@ -1158,8 +1157,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "Environment variable override - None",
  {
    overlayDatabaseEnvVar: "none",
@@ -1169,8 +1167,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "Ignore invalid environment variable",
  {
    overlayDatabaseEnvVar: "invalid-mode",
@@ -1180,8 +1177,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "Ignore feature flag when analyzing non-default branch",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1192,8 +1188,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "Overlay-base database on default branch when feature enabled",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1206,15 +1201,14 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "Overlay-base database on default branch when feature enabled with custom analysis",
  {
    languages: [BuiltInLanguage.javascript],
    features: [Feature.OverlayAnalysis, Feature.OverlayAnalysisJavascript],
    codeScanningConfig: {
      packs: ["some-custom-pack@1.0.0"],
-    } as UserConfig,
+    },
    isDefaultBranch: true,
  },
  {
@@ -1223,8 +1217,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "Overlay-base database on default branch when code-scanning feature enabled",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1240,8 +1233,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "No overlay-base database on default branch if runner disk space is too low",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1260,8 +1252,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "No overlay-base database on default branch if we can't determine runner disk space",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1277,8 +1268,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "Overlay-base database on default branch if runner disk space is too low and skip resource checks flag is enabled",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1299,8 +1289,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "No overlay-base database on default branch if runner disk space is below v2 limit and v2 resource checks enabled",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1320,8 +1309,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "Overlay-base database on default branch if runner disk space is between v2 and v1 limits and v2 resource checks enabled",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1342,8 +1330,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "No overlay-base database on default branch if runner disk space is between v2 and v1 limits and v2 resource checks not enabled",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1362,8 +1349,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "No overlay-base database on default branch if memory flag is too low",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1379,8 +1365,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "Overlay-base database on default branch if memory flag is too low but CodeQL >= 2.24.3",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1398,8 +1383,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "Overlay-base database on default branch if memory flag is too low and skip resource checks flag is enabled",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1417,8 +1401,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "No overlay-base database on default branch when cached status indicates previous failure",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1435,8 +1418,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "No overlay analysis on PR when cached status indicates previous failure",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1453,8 +1435,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "No overlay-base database on default branch when code-scanning feature enabled with disable-default-queries",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1464,7 +1445,7 @@ test.serial(
    ],
    codeScanningConfig: {
      "disable-default-queries": true,
-    } as UserConfig,
+    },
    isDefaultBranch: true,
  },
  {
@@ -1472,8 +1453,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "No overlay-base database on default branch when code-scanning feature enabled with packs",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1483,7 +1463,7 @@ test.serial(
    ],
    codeScanningConfig: {
      packs: ["some-custom-pack@1.0.0"],
-    } as UserConfig,
+    },
    isDefaultBranch: true,
  },
  {
@@ -1491,8 +1471,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "No overlay-base database on default branch when code-scanning feature enabled with queries",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1502,7 +1481,7 @@ test.serial(
    ],
    codeScanningConfig: {
      queries: [{ uses: "some-query.ql" }],
-    } as UserConfig,
+    },
    isDefaultBranch: true,
  },
  {
@@ -1510,8 +1489,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "No overlay-base database on default branch when code-scanning feature enabled with query-filters",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1521,7 +1499,7 @@ test.serial(
    ],
    codeScanningConfig: {
      "query-filters": [{ include: { "security-severity": "high" } }],
-    } as UserConfig,
+    },
    isDefaultBranch: true,
  },
  {
@@ -1529,8 +1507,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "No overlay-base database on default branch when only language-specific feature enabled",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1542,8 +1519,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "No overlay-base database on default branch when only code-scanning feature enabled",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1555,8 +1531,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "No overlay-base database on default branch when language-specific feature disabled",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1568,8 +1543,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "Overlay analysis on PR when feature enabled",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1582,15 +1556,14 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "Overlay analysis on PR when feature enabled with custom analysis",
  {
    languages: [BuiltInLanguage.javascript],
    features: [Feature.OverlayAnalysis, Feature.OverlayAnalysisJavascript],
    codeScanningConfig: {
      packs: ["some-custom-pack@1.0.0"],
-    } as UserConfig,
+    },
    isPullRequest: true,
  },
  {
@@ -1599,8 +1572,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "Overlay analysis on PR when code-scanning feature enabled",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1616,8 +1588,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "No overlay analysis on PR if runner disk space is too low",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1636,8 +1607,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "Overlay analysis on PR if runner disk space is too low and skip resource checks flag is enabled",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1658,8 +1628,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "No overlay analysis on PR if we can't determine runner disk space",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1675,8 +1644,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "No overlay analysis on PR if memory flag is too low",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1692,8 +1660,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "Overlay analysis on PR if memory flag is too low but CodeQL >= 2.24.3",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1711,8 +1678,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "Overlay analysis on PR if memory flag is too low and skip resource checks flag is enabled",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1730,8 +1696,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "No overlay analysis on PR when code-scanning feature enabled with disable-default-queries",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1741,7 +1706,7 @@ test.serial(
    ],
    codeScanningConfig: {
      "disable-default-queries": true,
-    } as UserConfig,
+    },
    isPullRequest: true,
  },
  {
@@ -1749,8 +1714,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "No overlay analysis on PR when code-scanning feature enabled with packs",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1760,7 +1724,7 @@ test.serial(
    ],
    codeScanningConfig: {
      packs: ["some-custom-pack@1.0.0"],
-    } as UserConfig,
+    },
    isPullRequest: true,
  },
  {
@@ -1768,8 +1732,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "No overlay analysis on PR when code-scanning feature enabled with queries",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1779,7 +1742,7 @@ test.serial(
    ],
    codeScanningConfig: {
      queries: [{ uses: "some-query.ql" }],
-    } as UserConfig,
+    },
    isPullRequest: true,
  },
  {
@@ -1787,8 +1750,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "No overlay analysis on PR when code-scanning feature enabled with query-filters",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1798,7 +1760,7 @@ test.serial(
    ],
    codeScanningConfig: {
      "query-filters": [{ include: { "security-severity": "high" } }],
-    } as UserConfig,
+    },
    isPullRequest: true,
  },
  {
@@ -1806,8 +1768,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "No overlay analysis on PR when only language-specific feature enabled",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1819,8 +1780,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "No overlay analysis on PR when only code-scanning feature enabled",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1832,8 +1792,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "No overlay analysis on PR when language-specific feature disabled",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1845,8 +1804,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "Overlay PR analysis by env",
  {
    overlayDatabaseEnvVar: "overlay",
@@ -1857,8 +1815,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "Overlay PR analysis by env on a runner with low disk space",
  {
    overlayDatabaseEnvVar: "overlay",
@@ -1870,8 +1827,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "Overlay PR analysis by feature flag",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1884,8 +1840,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "Fallback due to autobuild with traced language",
  {
    overlayDatabaseEnvVar: "overlay",
@@ -1897,8 +1852,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "Fallback due to no build mode with traced language",
  {
    overlayDatabaseEnvVar: "overlay",
@@ -1910,8 +1864,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "Fallback due to old CodeQL version",
  {
    overlayDatabaseEnvVar: "overlay",
@@ -1922,8 +1875,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "Fallback due to missing git root",
  {
    overlayDatabaseEnvVar: "overlay",
@@ -1934,8 +1886,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "Fallback due to old git version with submodules",
  {
    overlayDatabaseEnvVar: "overlay",
@@ -1947,8 +1898,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "Fallback when git version cannot be determined and repo has submodules",
  {
    overlayDatabaseEnvVar: "overlay",
@@ -1960,8 +1910,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "Overlay enabled when git version cannot be determined and repo has no submodules",
  {
    overlayDatabaseEnvVar: "overlay",
@@ -1974,8 +1923,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "No overlay when disabled via repository property",
  {
    languages: [BuiltInLanguage.javascript],
@@ -1990,8 +1938,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "Overlay not disabled when repository property is false",
  {
    languages: [BuiltInLanguage.javascript],
@@ -2007,8 +1954,7 @@ test.serial(
  },
 );

-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "Environment variable override takes precedence over repository property",
  {
    overlayDatabaseEnvVar: "overlay",
@@ -2024,8 +1970,7 @@ test.serial(

 // Exercise language-specific overlay analysis features code paths
 for (const language in BuiltInLanguage) {
-  test.serial(
-    checkOverlayEnablementMacro,
+  checkOverlayEnablementMacro.serial(
    `Check default overlay analysis feature for ${language}`,
    {
      languages: [language],
@@ -2042,8 +1987,7 @@ for (const language in BuiltInLanguage) {
 // overlay analysis enabled, even when the base overlay feature flag is on.
 // Using swift here as it doesn't currently have overlay support — update this if
 // swift gains overlay support.
-test.serial(
-  checkOverlayEnablementMacro,
+checkOverlayEnablementMacro.serial(
  "No overlay analysis for language without per-language overlay feature flag",
  {
    languages: [BuiltInLanguage.swift],
@@ -2200,3 +2144,87 @@ test.serial(
    });
  },
 );
+
+test("applyIncrementalAnalysisSettings: no-op when mode is not Overlay and diff ranges are unavailable", async (t) => {
+  const config = createTestConfig({});
+  config.overlayDatabaseMode = OverlayDatabaseMode.None;
+  const codeql = createStubCodeQL({});
+  const logger = getRunnerLogger(true);
+
+  await configUtils.applyIncrementalAnalysisSettings(
+    config,
+    false,
+    codeql,
+    logger,
+  );
+
+  t.is(config.overlayDatabaseMode, OverlayDatabaseMode.None);
+  t.deepEqual(config.extraQueryExclusions, []);
+});
+
+test("applyIncrementalAnalysisSettings: keeps overlay mode and adds exclusions when diff ranges are available", async (t) => {
+  const config = createTestConfig({
+    overlayDatabaseMode: OverlayDatabaseMode.Overlay,
+  });
+  const codeql = createStubCodeQL({});
+  const logger = getRunnerLogger(true);
+
+  await configUtils.applyIncrementalAnalysisSettings(
+    config,
+    true,
+    codeql,
+    logger,
+  );
+
+  t.is(config.overlayDatabaseMode, OverlayDatabaseMode.Overlay);
+  t.deepEqual(config.extraQueryExclusions, [
+    { exclude: { tags: "exclude-from-incremental" } },
+  ]);
+});
+
+test("applyIncrementalAnalysisSettings: disables overlay analysis when diff ranges are unavailable", async (t) => {
+  const config = createTestConfig({
+    overlayDatabaseMode: OverlayDatabaseMode.Overlay,
+  });
+  config.useOverlayDatabaseCaching = true;
+  const codeql = createStubCodeQL({});
+  const logger = getRunnerLogger(true);
+  const addDiagnosticsStub = sinon
+    .stub(overlayDiagnostics, "addOverlayDisablementDiagnostics")
+    .resolves();
+
+  await configUtils.applyIncrementalAnalysisSettings(
+    config,
+    false,
+    codeql,
+    logger,
+  );
+
+  t.is(config.overlayDatabaseMode, OverlayDatabaseMode.None);
+  t.is(config.useOverlayDatabaseCaching, false);
+  t.deepEqual(config.extraQueryExclusions, []);
+  t.true(addDiagnosticsStub.calledOnce);
+  t.is(
+    addDiagnosticsStub.firstCall.args[2],
+    OverlayDisabledReason.DiffInformedAnalysisNotEnabled,
+  );
+});
+
+test("applyIncrementalAnalysisSettings: adds exclusions for diff-informed-only runs", async (t) => {
+  const config = createTestConfig({});
+  config.overlayDatabaseMode = OverlayDatabaseMode.None;
+  const codeql = createStubCodeQL({});
+  const logger = getRunnerLogger(true);
+
+  await configUtils.applyIncrementalAnalysisSettings(
+    config,
+    true,
+    codeql,
+    logger,
+  );
+
+  t.is(config.overlayDatabaseMode, OverlayDatabaseMode.None);
+  t.deepEqual(config.extraQueryExclusions, [
+    { exclude: { tags: "exclude-from-incremental" } },
+  ]);
+});
@@ -31,7 +31,7 @@ import {
  addNoLanguageDiagnostic,
  makeTelemetryDiagnostic,
 } from "./diagnostics";
-import { shouldPerformDiffInformedAnalysis } from "./diff-informed-analysis-utils";
+import { prepareDiffInformedAnalysis } from "./diff-informed-analysis-utils";
 import { EnvVar } from "./environment";
 import * as errorMessages from "./error-messages";
 import { Feature, FeatureEnablement } from "./feature-flags";
@@ -407,6 +407,7 @@ export async function getLanguages(
  return languages;
 }

+/** Splits the `languages` input into a list of raw languages without checking if they are supported by CodeQL. */
 export function getRawLanguagesNoAutodetect(
  languagesInput: string | undefined,
 ): string[] {
@@ -1076,6 +1077,48 @@ function hasQueryCustomisation(userConfig: UserConfig): boolean {
  );
 }

+/**
+ * Finalize the incremental-analysis configuration for this run.
+ *
+ * Overlay analysis has only been validated in combination with diff-informed
+ * analysis, so if `Overlay` mode was selected for a pull request but the diff
+ * ranges could not be computed, fall back to a full non-overlay analysis.
+ *
+ * Query exclusions for incremental-only queries are then applied whenever the
+ * diff ranges are available — which, after the fallback above, is exactly the
+ * set of runs where any kind of incremental analysis (overlay or
+ * diff-informed) is in effect.
+ */
+export async function applyIncrementalAnalysisSettings(
+  config: Config,
+  hasDiffRanges: boolean,
+  codeql: CodeQL,
+  logger: Logger,
+): Promise<void> {
+  if (
+    config.overlayDatabaseMode === OverlayDatabaseMode.Overlay &&
+    !hasDiffRanges
+  ) {
+    logger.info(
+      `Reverting overlay database mode to ${OverlayDatabaseMode.None} ` +
+        "because the PR diff ranges could not be computed.",
+    );
+    config.overlayDatabaseMode = OverlayDatabaseMode.None;
+    config.useOverlayDatabaseCaching = false;
+    await addOverlayDisablementDiagnostics(
+      config,
+      codeql,
+      OverlayDisabledReason.DiffInformedAnalysisNotEnabled,
+    );
+  }
+
+  if (hasDiffRanges) {
+    config.extraQueryExclusions.push({
+      exclude: { tags: "exclude-from-incremental" },
+    });
+  }
+}
+
 /**
 * Load and return the config.
 *
@@ -1230,18 +1273,18 @@ export async function initConfig(
    );
  }

-  if (
-    config.overlayDatabaseMode === OverlayDatabaseMode.Overlay ||
-    (await shouldPerformDiffInformedAnalysis(
-      inputs.codeql,
-      inputs.features,
-      logger,
-    ))
-  ) {
-    config.extraQueryExclusions.push({
-      exclude: { tags: "exclude-from-incremental" },
-    });
-  }
+  const hasDiffRanges = await prepareDiffInformedAnalysis(
+    inputs.codeql,
+    inputs.features,
+    logger,
+  );
+
+  await applyIncrementalAnalysisSettings(
+    config,
+    hasDiffRanges,
+    inputs.codeql,
+    logger,
+  );

  if (await isTrapCachingEnabled(features, config.overlayDatabaseMode)) {
    const { trapCaches, trapCacheDownloadTime } = await downloadCacheWithTime(
@@ -7,6 +7,7 @@ import {
  checkExpectedLogMessages,
  getRecordingLogger,
  LoggedMessage,
+  makeMacro,
 } from "../testing-utils";
 import { ConfigurationError, prettyPrintPack } from "../util";

@@ -15,7 +16,7 @@ import * as dbConfig from "./db-config";
 /**
 * Test macro for ensuring the packs block is valid
 */
-const parsePacksMacro = test.macro({
+const parsePacksMacro = makeMacro({
  exec: (
    t: ExecutionContext<unknown>,
    packsInput: string,
@@ -33,7 +34,7 @@ const parsePacksMacro = test.macro({
 /**
 * Test macro for testing when the packs block is invalid
 */
-const parsePacksErrorMacro = test.macro({
+const parsePacksErrorMacro = makeMacro({
  exec: (
    t: ExecutionContext<unknown>,
    packsInput: string,
@@ -49,34 +50,32 @@ const parsePacksErrorMacro = test.macro({
 /**
 * Test macro for testing when the packs block is invalid
 */
-const invalidPackNameMacro = test.macro({
-  exec: (t: ExecutionContext, name: string) =>
-    parsePacksErrorMacro.exec(
+const invalidPackNameMacro = makeMacro({
+  exec: (t: ExecutionContext, arg: string) =>
+    parsePacksErrorMacro.fn(
      t,
-      name,
+      arg,
      [BuiltInLanguage.cpp],
-      new RegExp(`^"${name}" is not a valid pack$`),
+      new RegExp(`^"${arg}" is not a valid pack$`),
    ),
  title: (_providedTitle: string | undefined, arg: string | undefined) =>
    `Invalid pack string: ${arg}`,
 });

-test("no packs", parsePacksMacro, "", [], undefined);
-test("two packs", parsePacksMacro, "a/b,c/d@1.2.3", [BuiltInLanguage.cpp], {
+parsePacksMacro("no packs", "", [], undefined);
+parsePacksMacro("two packs", "a/b,c/d@1.2.3", [BuiltInLanguage.cpp], {
  [BuiltInLanguage.cpp]: ["a/b", "c/d@1.2.3"],
 });
-test(
+parsePacksMacro(
  "two packs with spaces",
-  parsePacksMacro,
  " a/b , c/d@1.2.3 ",
  [BuiltInLanguage.cpp],
  {
    [BuiltInLanguage.cpp]: ["a/b", "c/d@1.2.3"],
  },
 );
-test(
+parsePacksErrorMacro(
  "two packs with language",
-  parsePacksErrorMacro,
  "a/b,c/d@1.2.3",
  [BuiltInLanguage.cpp, BuiltInLanguage.java],
  new RegExp(
@@ -85,9 +84,8 @@ test(
  ),
 );

-test(
+parsePacksMacro(
  "packs with other valid names",
-  parsePacksMacro,
  [
    // ranges are ok
    "c/d@1.0",
@@ -123,23 +121,23 @@ test(
  },
 );

-test(invalidPackNameMacro, "c"); // all packs require at least a scope and a name
-test(invalidPackNameMacro, "c-/d");
-test(invalidPackNameMacro, "-c/d");
-test(invalidPackNameMacro, "c/d_d");
-test(invalidPackNameMacro, "c/d@@");
-test(invalidPackNameMacro, "c/d@1.0.0:");
-test(invalidPackNameMacro, "c/d:");
-test(invalidPackNameMacro, "c/d:/a");
-test(invalidPackNameMacro, "@1.0.0:a");
-test(invalidPackNameMacro, "c/d@../a");
-test(invalidPackNameMacro, "c/d@b/../a");
-test(invalidPackNameMacro, "c/d:z@1");
+invalidPackNameMacro.test("c"); // all packs require at least a scope and a name
+invalidPackNameMacro.test("c-/d");
+invalidPackNameMacro.test("-c/d");
+invalidPackNameMacro.test("c/d_d");
+invalidPackNameMacro.test("c/d@@");
+invalidPackNameMacro.test("c/d@1.0.0:");
+invalidPackNameMacro.test("c/d:");
+invalidPackNameMacro.test("c/d:/a");
+invalidPackNameMacro.test("@1.0.0:a");
+invalidPackNameMacro.test("c/d@../a");
+invalidPackNameMacro.test("c/d@b/../a");
+invalidPackNameMacro.test("c/d:z@1");

 /**
 * Test macro for pretty printing pack specs
 */
-const packSpecPrettyPrintingMacro = test.macro({
+const packSpecPrettyPrintingMacro = makeMacro({
  exec: (t: ExecutionContext, packStr: string, packObj: dbConfig.Pack) => {
    const parsed = dbConfig.parsePacksSpecification(packStr);
    t.deepEqual(parsed, packObj, "parsed pack spec is correct");
@@ -163,36 +161,35 @@ const packSpecPrettyPrintingMacro = test.macro({
  ) => `Prettyprint pack spec: '${packStr}'`,
 });

-test(packSpecPrettyPrintingMacro, "a/b", {
+packSpecPrettyPrintingMacro.test("a/b", {
  name: "a/b",
  version: undefined,
  path: undefined,
 });
-test(packSpecPrettyPrintingMacro, "a/b@~1.2.3", {
+packSpecPrettyPrintingMacro.test("a/b@~1.2.3", {
  name: "a/b",
  version: "~1.2.3",
  path: undefined,
 });
-test(packSpecPrettyPrintingMacro, "a/b@~1.2.3:abc/def", {
+packSpecPrettyPrintingMacro.test("a/b@~1.2.3:abc/def", {
  name: "a/b",
  version: "~1.2.3",
  path: "abc/def",
 });
-test(packSpecPrettyPrintingMacro, "a/b:abc/def", {
+packSpecPrettyPrintingMacro.test("a/b:abc/def", {
  name: "a/b",
  version: undefined,
  path: "abc/def",
 });
-test(packSpecPrettyPrintingMacro, "    a/b:abc/def    ", {
+packSpecPrettyPrintingMacro.test("    a/b:abc/def    ", {
  name: "a/b",
  version: undefined,
  path: "abc/def",
 });

-const calculateAugmentationMacro = test.macro({
+const calculateAugmentationMacro = makeMacro({
  exec: async (
    t: ExecutionContext,
-    _title: string,
    rawPacksInput: string | undefined,
    rawQueriesInput: string | undefined,
    languages: Language[],
@@ -207,11 +204,10 @@ const calculateAugmentationMacro = test.macro({
    );
    t.deepEqual(actualAugmentationProperties, expectedAugmentationProperties);
  },
-  title: (_, title) => `Calculate Augmentation: ${title}`,
+  title: (title) => `Calculate Augmentation: ${title}`,
 });

-test(
-  calculateAugmentationMacro,
+calculateAugmentationMacro(
  "All empty",
  undefined,
  undefined,
@@ -222,8 +218,7 @@ test(
  },
 );

-test(
-  calculateAugmentationMacro,
+calculateAugmentationMacro(
  "With queries",
  undefined,
  " a, b , c, d",
@@ -235,8 +230,7 @@ test(
  },
 );

-test(
-  calculateAugmentationMacro,
+calculateAugmentationMacro(
  "With queries combining",
  undefined,
  "   +   a, b , c, d ",
@@ -249,8 +243,7 @@ test(
  },
 );

-test(
-  calculateAugmentationMacro,
+calculateAugmentationMacro(
  "With packs",
  "   codeql/a , codeql/b   , codeql/c  , codeql/d  ",
  undefined,
@@ -262,8 +255,7 @@ test(
  },
 );

-test(
-  calculateAugmentationMacro,
+calculateAugmentationMacro(
  "With packs combining",
  "   +   codeql/a, codeql/b, codeql/c, codeql/d",
  undefined,
@@ -276,8 +268,7 @@ test(
  },
 );

-test(
-  calculateAugmentationMacro,
+calculateAugmentationMacro(
  "With repo property queries",
  undefined,
  undefined,
@@ -294,8 +285,7 @@ test(
  },
 );

-test(
-  calculateAugmentationMacro,
+calculateAugmentationMacro(
  "With repo property queries combining",
  undefined,
  undefined,
@@ -312,10 +302,9 @@ test(
  },
 );

-const calculateAugmentationErrorMacro = test.macro({
+const calculateAugmentationErrorMacro = makeMacro({
  exec: async (
    t: ExecutionContext,
-    _title: string,
    rawPacksInput: string | undefined,
    rawQueriesInput: string | undefined,
    languages: Language[],
@@ -333,11 +322,10 @@ const calculateAugmentationErrorMacro = test.macro({
      { message: expectedError },
    );
  },
-  title: (_, title) => `Calculate Augmentation Error: ${title}`,
+  title: (title) => `Calculate Augmentation Error: ${title}`,
 });

-test(
-  calculateAugmentationErrorMacro,
+calculateAugmentationErrorMacro(
  "Plus (+) with nothing else (queries)",
  undefined,
  "   +   ",
@@ -346,8 +334,7 @@ test(
  /The workflow property "queries" is invalid/,
 );

-test(
-  calculateAugmentationErrorMacro,
+calculateAugmentationErrorMacro(
  "Plus (+) with nothing else (packs)",
  "   +   ",
  undefined,
@@ -356,8 +343,7 @@ test(
  /The workflow property "packs" is invalid/,
 );

-test(
-  calculateAugmentationErrorMacro,
+calculateAugmentationErrorMacro(
  "Plus (+) with nothing else (repo property queries)",
  undefined,
  undefined,
@@ -368,8 +354,7 @@ test(
  /The repository property "github-codeql-extra-queries" is invalid/,
 );

-test(
-  calculateAugmentationErrorMacro,
+calculateAugmentationErrorMacro(
  "Packs input with multiple languages",
  "   +  a/b, c/d ",
  undefined,
@@ -378,8 +363,7 @@ test(
  /Cannot specify a 'packs' input in a multi-language analysis/,
 );

-test(
-  calculateAugmentationErrorMacro,
+calculateAugmentationErrorMacro(
  "Packs input with no languages",
  "   +  a/b, c/d ",
  undefined,
@@ -388,8 +372,7 @@ test(
  /No languages specified/,
 );

-test(
-  calculateAugmentationErrorMacro,
+calculateAugmentationErrorMacro(
  "Invalid packs",
  " a-pack-without-a-scope ",
  undefined,
@@ -263,7 +263,7 @@ export function getArtifactSuffix(matrix: string | undefined): string {
    try {
      const matrixObject = JSON.parse(matrix);
      if (json.isObject(matrixObject)) {
-        for (const matrixKey of Object.keys(matrixObject as object).sort())
+        for (const matrixKey of Object.keys(matrixObject).sort())
          suffix += `-${matrixObject[matrixKey]}`;
      } else {
        core.warning("User-specified `matrix` input is not an object.");
@@ -1,6 +1,6 @@
 {
-  "bundleVersion": "codeql-bundle-v2.25.3",
-  "cliVersion": "2.25.3",
-  "priorBundleVersion": "codeql-bundle-v2.25.2",
-  "priorCliVersion": "2.25.2"
+  "bundleVersion": "codeql-bundle-v2.25.4",
+  "cliVersion": "2.25.4",
+  "priorBundleVersion": "codeql-bundle-v2.25.3",
+  "priorCliVersion": "2.25.3"
 }
@@ -5,17 +5,20 @@ import * as actionsUtil from "./actions-util";
 import type { PullRequestBranches } from "./actions-util";
 import * as apiClient from "./api-client";
 import {
-  shouldPerformDiffInformedAnalysis,
+  getDiffInformedAnalysisBranches,
+  prepareDiffInformedAnalysis,
  exportedForTesting,
 } from "./diff-informed-analysis-utils";
-import { Feature, initFeatures } from "./feature-flags";
+import { Feature, FeatureEnablement, initFeatures } from "./feature-flags";
 import { getRunnerLogger } from "./logging";
 import { parseRepositoryNwo } from "./repository";
 import {
  setupTests,
+  createFeatures,
  mockCodeQLVersion,
  mockFeatureFlagApiEndpoint,
  setupActionsVars,
+  makeMacro,
 } from "./testing-utils";
 import { GitHubVariant, withTmpDir } from "./util";
 import type { GitHubVersion } from "./util";
@@ -42,10 +45,9 @@ const defaultTestCase: DiffInformedAnalysisTestCase = {
  codeQLVersion: "2.21.0",
 };

-const testShouldPerformDiffInformedAnalysis = test.macro({
+const testShouldPerformDiffInformedAnalysis = makeMacro({
  exec: async (
    t: ExecutionContext,
-    _title: string,
    partialTestCase: Partial<DiffInformedAnalysisTestCase>,
    expectedResult: boolean,
  ) => {
@@ -73,39 +75,34 @@ const testShouldPerformDiffInformedAnalysis = test.macro({
        [Feature.DiffInformedQueries]: testCase.featureEnabled,
      });

-      const getGitHubVersionStub = sinon
+      sinon
        .stub(apiClient, "getGitHubVersion")
        .resolves(testCase.gitHubVersion);
-      const getPullRequestBranchesStub = sinon
+      sinon
        .stub(actionsUtil, "getPullRequestBranches")
        .returns(testCase.pullRequestBranches);

-      const result = await shouldPerformDiffInformedAnalysis(
+      const branches = await getDiffInformedAnalysisBranches(
        codeql,
        features,
        logger,
      );

-      t.is(result, expectedResult);
+      t.is(branches !== undefined, expectedResult);

      delete process.env.CODEQL_ACTION_DIFF_INFORMED_QUERIES;
-
-      getGitHubVersionStub.restore();
-      getPullRequestBranchesStub.restore();
    });
  },
-  title: (_, title) => `shouldPerformDiffInformedAnalysis: ${title}`,
+  title: (title) => `getDiffInformedAnalysisBranches: ${title}`,
 });

-test.serial(
-  testShouldPerformDiffInformedAnalysis,
+testShouldPerformDiffInformedAnalysis.serial(
  "returns true in the default test case",
  {},
  true,
 );

-test.serial(
-  testShouldPerformDiffInformedAnalysis,
+testShouldPerformDiffInformedAnalysis.serial(
  "returns false when feature flag is disabled from the API",
  {
    featureEnabled: false,
@@ -113,8 +110,7 @@ test.serial(
  false,
 );

-test.serial(
-  testShouldPerformDiffInformedAnalysis,
+testShouldPerformDiffInformedAnalysis.serial(
  "returns false when CODEQL_ACTION_DIFF_INFORMED_QUERIES is set to false",
  {
    featureEnabled: true,
@@ -123,8 +119,7 @@ test.serial(
  false,
 );

-test.serial(
-  testShouldPerformDiffInformedAnalysis,
+testShouldPerformDiffInformedAnalysis.serial(
  "returns true when CODEQL_ACTION_DIFF_INFORMED_QUERIES is set to true",
  {
    featureEnabled: false,
@@ -133,8 +128,7 @@ test.serial(
  true,
 );

-test.serial(
-  testShouldPerformDiffInformedAnalysis,
+testShouldPerformDiffInformedAnalysis.serial(
  "returns false for CodeQL version 2.20.0",
  {
    codeQLVersion: "2.20.0",
@@ -142,8 +136,7 @@ test.serial(
  false,
 );

-test.serial(
-  testShouldPerformDiffInformedAnalysis,
+testShouldPerformDiffInformedAnalysis.serial(
  "returns false for invalid GHES version",
  {
    gitHubVersion: {
@@ -154,8 +147,7 @@ test.serial(
  false,
 );

-test.serial(
-  testShouldPerformDiffInformedAnalysis,
+testShouldPerformDiffInformedAnalysis.serial(
  "returns false for GHES version 3.18.5",
  {
    gitHubVersion: {
@@ -166,8 +158,7 @@ test.serial(
  false,
 );

-test.serial(
-  testShouldPerformDiffInformedAnalysis,
+testShouldPerformDiffInformedAnalysis.serial(
  "returns true for GHES version 3.19.0",
  {
    gitHubVersion: {
@@ -178,8 +169,7 @@ test.serial(
  true,
 );

-test.serial(
-  testShouldPerformDiffInformedAnalysis,
+testShouldPerformDiffInformedAnalysis.serial(
  "returns false when not a pull request",
  {
    pullRequestBranches: undefined,
@@ -187,6 +177,135 @@ test.serial(
  false,
 );

+test.serial(
+  "prepareDiffInformedAnalysis: returns false when not a pull request",
+  async (t) => {
+    await withTmpDir(async (tmpDir) => {
+      setupActionsVars(tmpDir, tmpDir);
+      const logger = getRunnerLogger(true);
+      const codeql = mockCodeQLVersion("2.21.0");
+      const features = createFeatures([Feature.DiffInformedQueries]);
+
+      sinon.stub(actionsUtil, "getPullRequestBranches").returns(undefined);
+      sinon
+        .stub(apiClient, "getGitHubVersion")
+        .resolves({ type: GitHubVariant.DOTCOM });
+
+      const result = await prepareDiffInformedAnalysis(
+        codeql,
+        features,
+        logger,
+      );
+
+      t.false(result);
+    });
+  },
+);
+
+test.serial(
+  "prepareDiffInformedAnalysis: returns false when applicability check throws",
+  async (t) => {
+    await withTmpDir(async (tmpDir) => {
+      setupActionsVars(tmpDir, tmpDir);
+      const logger = getRunnerLogger(true);
+      const codeql = mockCodeQLVersion("2.21.0");
+      // A features implementation whose getValue rejects, simulating an
+      // unexpected failure when determining whether diff-informed analysis
+      // should run.
+      const features: FeatureEnablement = {
+        getEnabledDefaultCliVersions: async () => {
+          throw new Error("not implemented");
+        },
+        getValue: async () => {
+          throw new Error("feature flag lookup failed");
+        },
+      };
+
+      const result = await prepareDiffInformedAnalysis(
+        codeql,
+        features,
+        logger,
+      );
+
+      t.false(result);
+    });
+  },
+);
+
+test.serial(
+  "prepareDiffInformedAnalysis: returns true when the diff is fetched successfully",
+  async (t) => {
+    await withTmpDir(async (tmpDir) => {
+      setupActionsVars(tmpDir, tmpDir);
+      const logger = getRunnerLogger(true);
+      const codeql = mockCodeQLVersion("2.21.0");
+      const features = createFeatures([Feature.DiffInformedQueries]);
+
+      sinon
+        .stub(actionsUtil, "getPullRequestBranches")
+        .returns({ base: "main", head: "feature" });
+      sinon
+        .stub(apiClient, "getGitHubVersion")
+        .resolves({ type: GitHubVariant.DOTCOM });
+      // eslint-disable-next-line @typescript-eslint/no-unsafe-argument
+      sinon.stub(apiClient, "getApiClient").returns({
+        rest: {
+          repos: {
+            compareCommitsWithBasehead: sinon
+              .stub()
+              .resolves({ data: { files: [] } }),
+          },
+        },
+      } as any);
+
+      const result = await prepareDiffInformedAnalysis(
+        codeql,
+        features,
+        logger,
+      );
+
+      t.true(result);
+    });
+  },
+);
+
+test.serial(
+  "prepareDiffInformedAnalysis: returns false when the diff API call fails",
+  async (t) => {
+    await withTmpDir(async (tmpDir) => {
+      setupActionsVars(tmpDir, tmpDir);
+      const logger = getRunnerLogger(true);
+      const codeql = mockCodeQLVersion("2.21.0");
+      const features = createFeatures([Feature.DiffInformedQueries]);
+
+      sinon
+        .stub(actionsUtil, "getPullRequestBranches")
+        .returns({ base: "main", head: "feature" });
+      sinon
+        .stub(apiClient, "getGitHubVersion")
+        .resolves({ type: GitHubVariant.DOTCOM });
+      const notFoundError: any = new Error("Not Found");
+      notFoundError.status = 404;
+      // eslint-disable-next-line @typescript-eslint/no-unsafe-argument
+      sinon.stub(apiClient, "getApiClient").returns({
+        rest: {
+          repos: {
+            compareCommitsWithBasehead: sinon.stub().rejects(notFoundError),
+          },
+        },
+      } as any);
+
+      const result = await prepareDiffInformedAnalysis(
+        codeql,
+        features,
+        logger,
+      );
+
+      t.false(result);
+    });
+  },
+);
+
 function runGetDiffRanges(changes: number, patch: string[] | undefined): any {
  return exportedForTesting.getDiffRanges(
    {
@@ -5,9 +5,9 @@ import type { PullRequestBranches } from "./actions-util";
 import { getApiClient, getGitHubVersion } from "./api-client";
 import type { CodeQL } from "./codeql";
 import { Feature, FeatureEnablement } from "./feature-flags";
-import { Logger } from "./logging";
+import { Logger, withGroupAsync } from "./logging";
 import { getRepositoryNwoFromEnv } from "./repository";
-import { GitHubVariant, satisfiesGHESVersion } from "./util";
+import { getErrorMessage, GitHubVariant, satisfiesGHESVersion } from "./util";

 /**
 * This interface is an abbreviated version of the file diff object returned by
@@ -21,20 +21,6 @@ interface FileDiff {
  patch?: string | undefined;
 }

-/**
- * Check if the action should perform diff-informed analysis.
- */
-export async function shouldPerformDiffInformedAnalysis(
-  codeql: CodeQL,
-  features: FeatureEnablement,
-  logger: Logger,
-): Promise<boolean> {
-  return (
-    (await getDiffInformedAnalysisBranches(codeql, features, logger)) !==
-    undefined
-  );
-}
-
 /**
 * Get the branches to use for diff-informed analysis.
 *
@@ -69,6 +55,46 @@ export async function getDiffInformedAnalysisBranches(
  return branches;
 }

+/**
+ * Prepares the diff ranges needed for diff-informed analysis for the current
+ * run.
+ *
+ * @returns `true` if the diff ranges were successfully computed and persisted
+ *   and are therefore available for use, `false` otherwise.
+ */
+export async function prepareDiffInformedAnalysis(
+  codeql: CodeQL,
+  features: FeatureEnablement,
+  logger: Logger,
+): Promise<boolean> {
+  let branches: PullRequestBranches | undefined;
+  try {
+    branches = await getDiffInformedAnalysisBranches(codeql, features, logger);
+  } catch (e) {
+    // If we cannot determine whether diff-informed analysis applies (for
+    // example, because a feature-flag lookup failed), treat it as not
+    // applicable rather than triggering the overlay fallback.
+    logger.warning(
+      `Failed to determine branch information for diff-informed analysis: ${getErrorMessage(e)}`,
+    );
+    return false;
+  }
+  if (!branches) {
+    return false;
+  }
+
+  return await withGroupAsync("Computing PR diff ranges", async () => {
+    try {
+      return await computeAndPersistDiffRanges(branches, logger);
+    } catch (e) {
+      logger.warning(
+        `Failed to compute diff-informed analysis ranges: ${getErrorMessage(e)}`,
+      );
+      return false;
+    }
+  });
+}
+
 export interface DiffThunkRange {
  /** Relative path from the repository root, using forward slashes as separators. */
  path: string;
@@ -151,6 +177,33 @@ export async function getPullRequestEditedDiffRanges(
  return results;
 }

+/**
+ * Compute and persist the diff ranges for a pull request. This fetches the
+ * diff from the GitHub API and writes it to the diff ranges JSON file so that
+ * CodeQL can use it for diff-informed analysis.
+ *
+ * @param branches The base and head branches of the pull request, as returned
+ *   by `getDiffInformedAnalysisBranches`.
+ * @param logger
+ * @returns `true` if the diff ranges were successfully computed and persisted,
+ *   otherwise `false`.
+ */
+export async function computeAndPersistDiffRanges(
+  branches: PullRequestBranches,
+  logger: Logger,
+): Promise<boolean> {
+  const ranges = await getPullRequestEditedDiffRanges(branches, logger);
+  if (ranges === undefined) {
+    return false;
+  }
+  writeDiffRangesJsonFile(logger, ranges);
+  const distinctFiles = new Set(ranges.map((r) => r.path)).size;
+  logger.info(
+    `Persisted ${ranges.length} diff range(s) across ${distinctFiles} file(s).`,
+  );
+  return true;
+}
+
 async function getFileDiffsWithBasehead(
  branches: PullRequestBranches,
  logger: Logger,
@@ -0,0 +1,3 @@
+export async function run__ACTION__() {
+  return await __ACTION__.runWrapper();
+}
@@ -451,12 +451,16 @@ test.serial(`selects CLI from defaults.json on GHES`, async (t) => {
  await withTmpDir(async (tmpDir) => {
    const features = setUpFeatureFlagTests(tmpDir);

-    const defaultCliVersion = await features.getDefaultCliVersion(
+    const defaultCliVersion = await features.getEnabledDefaultCliVersions(
      GitHubVariant.GHES,
    );
    t.deepEqual(defaultCliVersion, {
-      cliVersion: defaults.cliVersion,
-      tagName: defaults.bundleVersion,
+      enabledVersions: [
+        {
+          cliVersion: defaults.cliVersion,
+          tagName: defaults.bundleVersion,
+        },
+      ],
    });
  });
 });
@@ -482,10 +486,13 @@ for (const variant of [GitHubVariant.DOTCOM, GitHubVariant.GHEC_DR]) {
          false;
        mockFeatureFlagApiEndpoint(200, expectedFeatureEnablement);

-        const defaultCliVersion = await features.getDefaultCliVersion(variant);
+        const defaultCliVersion =
+          await features.getEnabledDefaultCliVersions(variant);
        t.deepEqual(defaultCliVersion, {
-          cliVersion: "2.20.1",
-          tagName: "codeql-bundle-v2.20.1",
+          enabledVersions: [
+            { cliVersion: "2.20.1", tagName: "codeql-bundle-v2.20.1" },
+            { cliVersion: "2.20.0", tagName: "codeql-bundle-v2.20.0" },
+          ],
          toolsFeatureFlagsValid: true,
        });
      });
@@ -500,10 +507,15 @@ for (const variant of [GitHubVariant.DOTCOM, GitHubVariant.GHEC_DR]) {
        const expectedFeatureEnablement = initializeFeatures(true);
        mockFeatureFlagApiEndpoint(200, expectedFeatureEnablement);

-        const defaultCliVersion = await features.getDefaultCliVersion(variant);
+        const defaultCliVersion =
+          await features.getEnabledDefaultCliVersions(variant);
        t.deepEqual(defaultCliVersion, {
-          cliVersion: defaults.cliVersion,
-          tagName: defaults.bundleVersion,
+          enabledVersions: [
+            {
+              cliVersion: defaults.cliVersion,
+              tagName: defaults.bundleVersion,
+            },
+          ],
          toolsFeatureFlagsValid: false,
        });
      });
@@ -529,10 +541,13 @@ for (const variant of [GitHubVariant.DOTCOM, GitHubVariant.GHEC_DR]) {
        ] = true;
        mockFeatureFlagApiEndpoint(200, expectedFeatureEnablement);

-        const defaultCliVersion = await features.getDefaultCliVersion(variant);
+        const defaultCliVersion =
+          await features.getEnabledDefaultCliVersions(variant);
        t.deepEqual(defaultCliVersion, {
-          cliVersion: "2.20.1",
-          tagName: "codeql-bundle-v2.20.1",
+          enabledVersions: [
+            { cliVersion: "2.20.1", tagName: "codeql-bundle-v2.20.1" },
+            { cliVersion: "2.20.0", tagName: "codeql-bundle-v2.20.0" },
+          ],
          toolsFeatureFlagsValid: true,
        });

@@ -26,12 +26,38 @@ const DEFAULT_VERSION_FEATURE_FLAG_SUFFIX = "_enabled";

 /**
 * The first version of the CodeQL Bundle that shipped with zstd-compressed bundles.
+ *
+ * This is now below the minimum version of CodeQL, but we keep this around because we currently set
+ * up CodeQL before checking that the version is new enough.
 */
 export const CODEQL_VERSION_ZSTD_BUNDLE = "2.19.0";

-export interface CodeQLDefaultVersionInfo {
+const LINKED_CODEQL_VERSION: CodeQLVersionInfo = {
+  cliVersion: defaults.cliVersion,
+  tagName: defaults.bundleVersion,
+};
+
+export interface CodeQLVersionInfo {
+  /** The version number of the CodeQL CLI, e.g. `2.19.0`. */
  cliVersion: string;
+  /**
+   * The tag name of the CodeQL Bundle associated with this version, e.g. `codeql-bundle-v2.19.0`.
+   */
  tagName: string;
+}
+
+export interface CodeQLDefaultVersionInfo {
+  /**
+   * CodeQL CLI versions that are enabled as defaults, sorted from highest to lowest.
+   *
+   * Guaranteed to be non-empty. When feature flags are unavailable, this falls back to a single
+   * entry containing the version pinned in `defaults.json`.
+   */
+  enabledVersions: CodeQLVersionInfo[];
+  /**
+   * If accessed, whether the tools feature flags are valid, i.e. contain at least one enabled
+   * version.
+   */
  toolsFeatureFlagsValid?: boolean;
 }

@@ -44,6 +70,8 @@ export interface CodeQLDefaultVersionInfo {
 * Legacy features should end with `_enabled`.
 */
 export enum Feature {
+  /** Controls whether we allow multiple values for the `analysis-kinds` input. */
+  AllowMultipleAnalysisKinds = "allow_multiple_analysis_kinds",
  AllowToolcacheInput = "allow_toolcache_input",
  CleanupTrapCaches = "cleanup_trap_caches",
  CppDependencyInstallation = "cpp_dependency_installation_enabled",
@@ -72,6 +100,19 @@ export enum Feature {
  OverlayAnalysisGo = "overlay_analysis_go",
  OverlayAnalysisJava = "overlay_analysis_java",
  OverlayAnalysisJavascript = "overlay_analysis_javascript",
+  /**
+   * When set, chooses the default CodeQL CLI version as the highest version that is both enabled by
+   * feature flags and present as an overlay-base database in the Actions cache for the configured
+   * languages. Falls back to the highest feature flagged version if no intersecting overlay-base
+   * database exists in the cache.
+   */
+  OverlayAnalysisMatchCodeqlVersion = "overlay_analysis_match_codeql_version",
+  /**
+   * Like `OverlayAnalysisMatchCodeqlVersion`, but only logs a diagnostic with the version that
+   * would have been chosen instead of actually changing the default CodeQL CLI version.
+   * `OverlayAnalysisMatchCodeqlVersion` overrides this flag.
+   */
+  OverlayAnalysisMatchCodeqlVersionDryRun = "overlay_analysis_match_codeql_version_dry_run",
  OverlayAnalysisPython = "overlay_analysis_python",
  /**
   * Controls whether lower disk space requirements are used for overlay hardware checks.
@@ -124,6 +165,11 @@ export type FeatureConfig = {
 };

 export const featureConfig = {
+  [Feature.AllowMultipleAnalysisKinds]: {
+    defaultValue: false,
+    envVar: "CODEQL_ACTION_ALLOW_MULTIPLE_ANALYSIS_KINDS",
+    minimumVersion: undefined,
+  },
  [Feature.AllowToolcacheInput]: {
    defaultValue: false,
    envVar: "CODEQL_ACTION_ALLOW_TOOLCACHE_INPUT",
@@ -277,6 +323,16 @@ export const featureConfig = {
    envVar: "CODEQL_ACTION_OVERLAY_ANALYSIS_DISABLE_TRAP_CACHING",
    minimumVersion: undefined,
  },
+  [Feature.OverlayAnalysisMatchCodeqlVersion]: {
+    defaultValue: false,
+    envVar: "CODEQL_ACTION_OVERLAY_ANALYSIS_MATCH_CODEQL_VERSION",
+    minimumVersion: undefined,
+  },
+  [Feature.OverlayAnalysisMatchCodeqlVersionDryRun]: {
+    defaultValue: false,
+    envVar: "CODEQL_ACTION_OVERLAY_ANALYSIS_MATCH_CODEQL_VERSION_DRY_RUN",
+    minimumVersion: undefined,
+  },
  [Feature.OverlayAnalysisResourceChecksV2]: {
    defaultValue: false,
    envVar: "CODEQL_ACTION_OVERLAY_ANALYSIS_RESOURCE_CHECKS_V2",
@@ -346,8 +402,12 @@ export type FeatureWithoutCLI = {
 }[keyof typeof featureConfig];

 export interface FeatureEnablement {
-  /** Gets the default version of the CodeQL tools. */
-  getDefaultCliVersion(
+  /**
+   * Returns the set of default CodeQL CLI versions to consider, sorted from
+   * highest to lowest. The first entry is the version that the CodeQL Action
+   * will use by default. The list is always non-empty.
+   */
+  getEnabledDefaultCliVersions(
    variant: util.GitHubVariant,
  ): Promise<CodeQLDefaultVersionInfo>;
  getValue(feature: FeatureWithoutCLI): Promise<boolean>;
@@ -371,12 +431,11 @@ export const FEATURE_FLAGS_FILE_NAME = "cached-feature-flags.json";
 class OfflineFeatures implements FeatureEnablement {
  constructor(protected readonly logger: Logger) {}

-  async getDefaultCliVersion(
+  async getEnabledDefaultCliVersions(
    _variant: util.GitHubVariant,
  ): Promise<CodeQLDefaultVersionInfo> {
    return {
-      cliVersion: defaults.cliVersion,
-      tagName: defaults.bundleVersion,
+      enabledVersions: [LINKED_CODEQL_VERSION],
    };
  }

@@ -386,7 +445,7 @@ class OfflineFeatures implements FeatureEnablement {
  getFeatureConfig(feature: Feature): FeatureConfig {
    // Narrow the type to FeatureConfig to avoid type errors. To avoid unsafe use of `as`, we
    // check that the required properties exist using `satisfies`.
-    return featureConfig[feature] satisfies FeatureConfig as FeatureConfig;
+    return featureConfig[feature] satisfies FeatureConfig;
  }

  /**
@@ -518,13 +577,13 @@ class Features extends OfflineFeatures {
    );
  }

-  async getDefaultCliVersion(
+  async getEnabledDefaultCliVersions(
    variant: util.GitHubVariant,
  ): Promise<CodeQLDefaultVersionInfo> {
    if (supportsFeatureFlags(variant)) {
-      return await this.gitHubFeatureFlags.getDefaultCliVersionFromFlags();
+      return await this.gitHubFeatureFlags.getEnabledDefaultCliVersionsFromFlags();
    }
-    return super.getDefaultCliVersion(variant);
+    return super.getEnabledDefaultCliVersions(variant);
  }

  /**
@@ -600,16 +659,22 @@ class GitHubFeatureFlags {
    return version;
  }

-  async getDefaultCliVersionFromFlags(): Promise<CodeQLDefaultVersionInfo> {
+  /**
+   * Returns CLI versions enabled by `default_codeql_version_*_enabled` feature
+   * flags, sorted from highest to lowest. Falls back to the version pinned in
+   * `defaults.json` if no such flags are enabled.
+   */
+  async getEnabledDefaultCliVersionsFromFlags(): Promise<CodeQLDefaultVersionInfo> {
    const response = await this.getAllFeatures();

-    const enabledFeatureFlagCliVersions = Object.entries(response)
+    const sortedCliVersions = Object.entries(response)
      .map(([f, isEnabled]) =>
        isEnabled ? this.getCliVersionFromFeatureFlag(f) : undefined,
      )
-      .filter((f): f is string => f !== undefined);
+      .filter((f): f is string => f !== undefined)
+      .sort(semver.rcompare);

-    if (enabledFeatureFlagCliVersions.length === 0) {
+    if (sortedCliVersions.length === 0) {
      // We expect at least one default CLI version to be enabled on Dotcom at any time. However if
      // the feature flags are misconfigured, rather than crashing, we fall back to the CLI version
      // shipped with the Action in defaults.json. This has the effect of immediately rolling out
@@ -625,8 +690,7 @@ class GitHubFeatureFlags {
          `shipped with the Action. This is ${defaults.cliVersion}.`,
      );
      const result: CodeQLDefaultVersionInfo = {
-        cliVersion: defaults.cliVersion,
-        tagName: defaults.bundleVersion,
+        enabledVersions: [LINKED_CODEQL_VERSION],
      };
      if (this.hasAccessedRemoteFeatureFlags) {
        result.toolsFeatureFlagsValid = false;
@@ -634,17 +698,14 @@ class GitHubFeatureFlags {
      return result;
    }

-    const maxCliVersion = enabledFeatureFlagCliVersions.reduce(
-      (maxVersion, currentVersion) =>
-        currentVersion > maxVersion ? currentVersion : maxVersion,
-      enabledFeatureFlagCliVersions[0],
-    );
    this.logger.debug(
-      `Derived default CLI version of ${maxCliVersion} from feature flags.`,
+      `Derived default CLI version of ${sortedCliVersions[0]} from feature flags.`,
    );
    return {
-      cliVersion: maxCliVersion,
-      tagName: `codeql-bundle-v${maxCliVersion}`,
+      enabledVersions: sortedCliVersions.map((cliVersion) => ({
+        cliVersion,
+        tagName: `codeql-bundle-v${cliVersion}`,
+      })),
      toolsFeatureFlagsValid: true,
    };
  }
@@ -33,7 +33,6 @@ test.serial(

      const actualRef = await gitUtils.getRef();
      t.deepEqual(actualRef, expectedRef);
-      callback.restore();
    });
  },
 );
@@ -54,7 +53,6 @@ test.serial(

      const actualRef = await gitUtils.getRef();
      t.deepEqual(actualRef, expectedRef);
-      callback.restore();
    });
  },
 );
@@ -73,7 +71,6 @@ test.serial(

      const actualRef = await gitUtils.getRef();
      t.deepEqual(actualRef, "refs/pull/1/head");
-      callback.restore();
    });
  },
 );
@@ -100,8 +97,6 @@ test.serial(

      const actualRef = await gitUtils.getRef();
      t.deepEqual(actualRef, "refs/pull/2/merge");
-      callback.restore();
-      getAdditionalInputStub.restore();
    });
  },
 );
@@ -161,7 +156,6 @@ test.serial(
            "Both 'ref' and 'sha' are required if one of them is provided.",
        },
      );
-      getAdditionalInputStub.restore();
    });
  },
 );
@@ -188,7 +182,6 @@ test.serial(
            "Both 'ref' and 'sha' are required if one of them is provided.",
        },
      );
-      getAdditionalInputStub.restore();
    });
  },
 );
@@ -242,7 +235,6 @@ test.serial("isAnalyzingDefaultBranch()", async (t) => {
    process.env["GITHUB_EVENT_NAME"] = "schedule";
    process.env["GITHUB_REF"] = "refs/heads/main";
    t.deepEqual(await gitUtils.isAnalyzingDefaultBranch(), false);
-    getAdditionalInputStub.restore();
  });
 });

@@ -254,8 +246,6 @@ test.serial("determineBaseBranchHeadCommitOid non-pullrequest", async (t) => {
  const result = await gitUtils.determineBaseBranchHeadCommitOid(__dirname);
  t.deepEqual(result, undefined);
  t.deepEqual(0, infoStub.callCount);
-
-  infoStub.restore();
 });

 test.serial(
@@ -276,8 +266,6 @@ test.serial(
      "git call failed. Will calculate the base branch SHA on the server. Error: " +
        "The checkout path provided to the action does not appear to be a git repository.",
    );
-
-    infoStub.restore();
  },
 );

@@ -301,10 +289,27 @@ test.serial("determineBaseBranchHeadCommitOid other error", async (t) => {
      "The checkout path provided to the action does not appear to be a git repository.",
    ),
  );
-
-  infoStub.restore();
 });

+test.serial(
+  "determineBaseBranchHeadCommitOid accepts SHA-256 OIDs",
+  async (t) => {
+    const mergeSha = "a".repeat(64);
+    const baseOid = "b".repeat(64);
+    const headOid = "c".repeat(64);
+
+    process.env["GITHUB_EVENT_NAME"] = "pull_request";
+    process.env["GITHUB_SHA"] = mergeSha;
+
+    sinon
+      .stub(gitUtils as any, "runGitCommand")
+      .resolves(`commit ${mergeSha}\nparent ${baseOid}\nparent ${headOid}\n`);
+
+    const result = await gitUtils.determineBaseBranchHeadCommitOid(__dirname);
+    t.deepEqual(result, baseOid);
+  },
+);
+
 test.serial("decodeGitFilePath unquoted strings", async (t) => {
  t.deepEqual(gitUtils.decodeGitFilePath("foo"), "foo");
  t.deepEqual(gitUtils.decodeGitFilePath("foo bar"), "foo bar");
@@ -436,6 +441,64 @@ test.serial("getFileOidsUnderPath handles quoted paths", async (t) => {
  });
 });

+test.serial("getFileOidsUnderPath handles SHA-256 OIDs", async (t) => {
+  await withTmpDir(async (tmpDir) => {
+    const sha256OidA =
+      "9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2c0d4b7e8f9a1234567890ab";
+    const sha256OidB =
+      "aabbccddeeff00112233445566778899aabbccddeeff00112233445566778899";
+
+    sinon
+      .stub(gitUtils as any, "runGitCommand")
+      .callsFake(async (_cwd: any, args: any) => {
+        if (args[0] === "rev-parse") {
+          return `${tmpDir}\n`;
+        }
+        return (
+          `100644 ${sha256OidA} 0\tlib/sha256-file-a.js\n` +
+          `100644 ${sha256OidB} 0\tsrc/sha256-file-b.ts`
+        );
+      });
+
+    const result = await gitUtils.getFileOidsUnderPath("/fake/path");
+
+    t.deepEqual(result, {
+      "lib/sha256-file-a.js": sha256OidA,
+      "src/sha256-file-b.ts": sha256OidB,
+    });
+  });
+});
+
+test.serial(
+  "getFileOidsUnderPath rejects OIDs of unsupported length",
+  async (t) => {
+    await withTmpDir(async (tmpDir) => {
+      // 50-char OID: not a valid SHA-1 (40) or SHA-256 (64) length. The regex
+      // must not accept this even though every character is a valid hex digit.
+      const invalidLine =
+        "100644 30d998ded095371488be3a729eb61d86ed721a1830d998ded0 0\tlib/bad.js";
+      sinon
+        .stub(gitUtils as any, "runGitCommand")
+        .callsFake(async (_cwd: any, args: any) => {
+          if (args[0] === "rev-parse") {
+            return `${tmpDir}\n`;
+          }
+          return invalidLine;
+        });
+
+      await t.throwsAsync(
+        async () => {
+          await gitUtils.getFileOidsUnderPath("/fake/path");
+        },
+        {
+          instanceOf: Error,
+          message: `Unexpected "git ls-files" output: ${invalidLine}`,
+        },
+      );
+    });
+  },
+);
+
 test.serial("getFileOidsUnderPath handles empty output", async (t) => {
  await withTmpDir(async (tmpDir) => {
    sinon
@@ -163,11 +163,12 @@ export const determineBaseBranchHeadCommitOid = async function (
      }
    }

-    // Let's confirm our assumptions: We had a merge commit and the parsed parent data looks correct
+    // Let's confirm our assumptions: We had a merge commit and the parsed parent
+    // data looks correct. OIDs are either 40 (SHA-1) or 64 (SHA-256) hex characters.
    if (
      commitOid === mergeSha &&
-      headOid.length === 40 &&
-      baseOid.length === 40
+      (headOid.length === 40 || headOid.length === 64) &&
+      (baseOid.length === 40 || baseOid.length === 64)
    ) {
      return baseOid;
    }
@@ -296,7 +297,8 @@ export const getFileOidsUnderPath = async function (
  // 100644 4c51bc1d9e86cd86e01b0f340cb8ce095c33b283 0\tsrc/git-utils.test.ts
  // 100644 6b792ea543ce75d7a8a03df591e3c85311ecb64f 0\tsrc/git-utils.ts
  // The fields are: <mode> <oid> <stage>\t<path>
-  const regex = /^[0-9]+ ([0-9a-f]{40}) [0-9]+\t(.+)$/;
+  // The OID is either 40 (SHA-1) or 64 (SHA-256) hex characters.
+  const regex = /^[0-9]+ ([0-9a-f]{40}|[0-9a-f]{64}) [0-9]+\t(.+)$/;
  for (const line of stdout.split("\n")) {
    if (line) {
      const match = line.match(regex);
@@ -19,6 +19,7 @@ import {
  createFeatures,
  createTestConfig,
  DEFAULT_ACTIONS_VARS,
+  makeMacro,
  makeVersionInfo,
  RecordingLogger,
  setupActionsVars,
@@ -601,7 +602,7 @@ async function testFailedSarifUpload(
  uploadFiles.resolves({
    sarifID: "42",
    statusReport: { raw_upload_size_bytes: 20, zipped_upload_size_bytes: 10 },
-  } as uploadLib.UploadResult);
+  });
  const waitForProcessing = sinon.stub(uploadLib, "waitForProcessing");

  const features = [] as Feature[];
@@ -796,7 +797,7 @@ test.serial(
  },
 );

-const skippedUploadTest = test.macro({
+const skippedUploadTest = makeMacro({
  exec: async (
    t: ExecutionContext<unknown>,
    config: Partial<configUtils.Config>,
@@ -823,9 +824,8 @@ const skippedUploadTest = test.macro({
    `tryUploadSarifIfRunFailed - skips upload ${providedTitle}`,
 });

-test.serial(
+skippedUploadTest.serial(
  "without CodeQL command",
-  skippedUploadTest,
  // No codeQLCmd
  {
    analysisKinds: [AnalysisKind.RiskAssessment],
@@ -834,9 +834,8 @@ test.serial(
  "CodeQL command not found",
 );

-test.serial(
+skippedUploadTest.serial(
  "if no language is configured",
-  skippedUploadTest,
  // No explicit language configuration
  {
    analysisKinds: [AnalysisKind.RiskAssessment],
@@ -845,9 +844,8 @@ test.serial(
  "Unexpectedly, the configuration is not for a single language.",
 );

-test.serial(
+skippedUploadTest.serial(
  "if multiple languages is configured",
-  skippedUploadTest,
  // Multiple explicit languages configured
  {
    analysisKinds: [AnalysisKind.RiskAssessment],
@@ -207,7 +207,7 @@ function getJobStatusFromEnvironment(): JobStatus | undefined {
  return undefined;
 }

-async function runWrapper() {
+export async function runWrapper() {
  const startedAt = new Date();
  const logger = getActionsLogger();
  try {
@@ -222,5 +222,3 @@ async function runWrapper() {
    );
  }
 }
-
-void runWrapper();
@@ -37,11 +37,6 @@ import {
  makeDiagnostic,
  makeTelemetryDiagnostic,
 } from "./diagnostics";
-import {
-  getDiffInformedAnalysisBranches,
-  getPullRequestEditedDiffRanges,
-  writeDiffRangesJsonFile,
-} from "./diff-informed-analysis-utils";
 import { EnvVar } from "./environment";
 import { Feature, FeatureEnablement, initFeatures } from "./feature-flags";
 import {
@@ -281,7 +276,7 @@ async function run(startedAt: Date) {
    // successful, the results are cached so that we don't duplicate the work in normal runs.
    let analysisKinds: AnalysisKind[] | undefined;
    try {
-      analysisKinds = await getAnalysisKinds(logger);
+      analysisKinds = await getAnalysisKinds(logger, features);
    } catch (err) {
      logger.debug(
        `Failed to parse analysis kinds for 'starting' status report: ${getErrorMessage(err)}`,
@@ -298,16 +293,23 @@ async function run(startedAt: Date) {
      );
    }

-    const codeQLDefaultVersionInfo = await features.getDefaultCliVersion(
-      gitHubVersion.type,
-    );
+    const codeQLDefaultVersionInfo =
+      await features.getEnabledDefaultCliVersions(gitHubVersion.type);
    toolsFeatureFlagsValid = codeQLDefaultVersionInfo.toolsFeatureFlagsValid;
+    const rawLanguages = configUtils.getRawLanguagesNoAutodetect(
+      getOptionalInput("languages"),
+    );
+    const useOverlayAwareDefaultCliVersion =
+      analysisKinds?.length === 1 &&
+      analysisKinds[0] === AnalysisKind.CodeScanning;
    const initCodeQLResult = await initCodeQL(
      getOptionalInput("tools"),
      apiDetails,
      getTemporaryDirectory(),
      gitHubVersion.type,
      codeQLDefaultVersionInfo,
+      rawLanguages,
+      useOverlayAwareDefaultCliVersion,
      features,
      logger,
    );
@@ -346,7 +348,7 @@ async function run(startedAt: Date) {
      }
    }

-    analysisKinds = await getAnalysisKinds(logger);
+    analysisKinds = await getAnalysisKinds(logger, features);
    const debugMode = getOptionalInput("debug") === "true" || core.isDebug();
    const repositoryProperties = repositoryPropertiesResult.orElse({});
    const fileCoverageResult = await getFileCoverageInformationEnabled(
@@ -427,7 +429,6 @@ async function run(startedAt: Date) {
    }

    await checkInstallPython311(config.languages, codeql);
-    await computeAndPersistDiffRanges(codeql, features, logger);
  } catch (unwrappedError) {
    const error = wrapError(unwrappedError);
    core.setFailed(error.message);
@@ -823,42 +824,6 @@ async function loadRepositoryProperties(
  }
 }

-/**
- * Compute and persist diff ranges when diff-informed analysis is enabled
- * (feature flag + PR context). This writes the standard pr-diff-range.json
- * file for later reuse in the analyze step. Failures are logged but non-fatal.
- */
-async function computeAndPersistDiffRanges(
-  codeql: CodeQL,
-  features: FeatureEnablement,
-  logger: Logger,
-): Promise<void> {
-  await withGroupAsync("Computing PR diff ranges", async () => {
-    try {
-      const branches = await getDiffInformedAnalysisBranches(
-        codeql,
-        features,
-        logger,
-      );
-      if (!branches) {
-        return;
-      }
-      const ranges = await getPullRequestEditedDiffRanges(branches, logger);
-      if (ranges === undefined) {
-        return;
-      }
-      writeDiffRangesJsonFile(logger, ranges);
-      const distinctFiles = new Set(ranges.map((r) => r.path)).size;
-      logger.info(
-        `Persisted ${ranges.length} diff range(s) across ${distinctFiles} file(s).`,
-      );
-    } catch (e) {
-      logger.warning(
-        `Failed to compute and persist PR diff ranges: ${getErrorMessage(e)}`,
-      );
-    }
-  });
-}
 async function recordZstdAvailability(
  config: configUtils.Config,
  zstdAvailability: ZstdAvailability,
@@ -873,7 +838,7 @@ async function recordZstdAvailability(
  );
 }

-async function runWrapper() {
+export async function runWrapper() {
  const startedAt = new Date();
  const logger = getActionsLogger();
  try {
@@ -889,5 +854,3 @@ async function runWrapper() {
  }
  await checkForTimeout();
 }
-
-void runWrapper();
@@ -22,6 +22,7 @@ import {
  createTestConfig,
  getRecordingLogger,
  setupTests,
+  makeMacro,
 } from "./testing-utils";
 import { ConfigurationError, withTmpDir } from "./util";

@@ -158,10 +159,9 @@ type PackInfo = {
  qlpackFileName?: string;
 };

-const testCheckPacksForOverlayCompatibility = test.macro({
+const testCheckPacksForOverlayCompatibility = makeMacro({
  exec: async (
    t: ExecutionContext,
-    _title: string,
    {
      cliOverlayVersion,
      languages,
@@ -234,11 +234,10 @@ const testCheckPacksForOverlayCompatibility = test.macro({
      );
    });
  },
-  title: (_, title) => `checkPacksForOverlayCompatibility: ${title}`,
+  title: (title) => `checkPacksForOverlayCompatibility: ${title}`,
 });

-test(
-  testCheckPacksForOverlayCompatibility,
+testCheckPacksForOverlayCompatibility(
  "returns false when CLI does not support overlay",
  {
    cliOverlayVersion: undefined,
@@ -253,8 +252,7 @@ test(
  },
 );

-test(
-  testCheckPacksForOverlayCompatibility,
+testCheckPacksForOverlayCompatibility(
  "returns true when there are no query packs",
  {
    cliOverlayVersion: 2,
@@ -264,8 +262,7 @@ test(
  },
 );

-test(
-  testCheckPacksForOverlayCompatibility,
+testCheckPacksForOverlayCompatibility(
  "returns true when query pack has not been compiled",
  {
    cliOverlayVersion: 2,
@@ -281,8 +278,7 @@ test(
  },
 );

-test(
-  testCheckPacksForOverlayCompatibility,
+testCheckPacksForOverlayCompatibility(
  "returns true when query pack has expected overlay version",
  {
    cliOverlayVersion: 2,
@@ -297,8 +293,7 @@ test(
  },
 );

-test(
-  testCheckPacksForOverlayCompatibility,
+testCheckPacksForOverlayCompatibility(
  "returns true when query packs for all languages to analyze are compatible",
  {
    cliOverlayVersion: 2,
@@ -317,8 +312,7 @@ test(
  },
 );

-test(
-  testCheckPacksForOverlayCompatibility,
+testCheckPacksForOverlayCompatibility(
  "returns true when query pack for a language not analyzed is incompatible",
  {
    cliOverlayVersion: 2,
@@ -337,8 +331,7 @@ test(
  },
 );

-test(
-  testCheckPacksForOverlayCompatibility,
+testCheckPacksForOverlayCompatibility(
  "returns false when query pack for a language to analyze is incompatible",
  {
    cliOverlayVersion: 2,
@@ -357,8 +350,7 @@ test(
  },
 );

-test(
-  testCheckPacksForOverlayCompatibility,
+testCheckPacksForOverlayCompatibility(
  "returns false when query pack is missing .packinfo",
  {
    cliOverlayVersion: 2,
@@ -377,8 +369,7 @@ test(
  },
 );

-test(
-  testCheckPacksForOverlayCompatibility,
+testCheckPacksForOverlayCompatibility(
  "returns false when query pack has different overlay version",
  {
    cliOverlayVersion: 2,
@@ -397,8 +388,7 @@ test(
  },
 );

-test(
-  testCheckPacksForOverlayCompatibility,
+testCheckPacksForOverlayCompatibility(
  "returns false when query pack is missing overlayVersion in .packinfo",
  {
    cliOverlayVersion: 2,
@@ -417,8 +407,7 @@ test(
  },
 );

-test(
-  testCheckPacksForOverlayCompatibility,
+testCheckPacksForOverlayCompatibility(
  "returns false when .packinfo is not valid JSON",
  {
    cliOverlayVersion: 2,
@@ -437,8 +426,7 @@ test(
  },
 );

-test(
-  testCheckPacksForOverlayCompatibility,
+testCheckPacksForOverlayCompatibility(
  "returns true when query pack uses codeql-pack.yml filename",
  {
    cliOverlayVersion: 2,
@@ -39,6 +39,8 @@ export async function initCodeQL(
  tempDir: string,
  variant: util.GitHubVariant,
  defaultCliVersion: CodeQLDefaultVersionInfo,
+  rawLanguages: string[] | undefined,
+  useOverlayAwareDefaultCliVersion: boolean,
  features: FeatureEnablement,
  logger: Logger,
 ): Promise<{
@@ -61,6 +63,8 @@ export async function initCodeQL(
    tempDir,
    variant,
    defaultCliVersion,
+    rawLanguages,
+    useOverlayAwareDefaultCliVersion,
    features,
    logger,
    true,
@@ -7,12 +7,13 @@ import * as sinon from "sinon";

 import * as actionsUtil from "../actions-util";
 import * as apiClient from "../api-client";
-import { ResolveDatabaseOutput } from "../codeql";
+import type { ResolveDatabaseOutput } from "../codeql";
 import * as gitUtils from "../git-utils";
 import { BuiltInLanguage } from "../languages";
 import { getRunnerLogger } from "../logging";
 import {
  createTestConfig,
+  makeMacro,
  mockCodeQLVersion,
  setupTests,
 } from "../testing-utils";
@@ -23,6 +24,7 @@ import {
  downloadOverlayBaseDatabaseFromCache,
  getCacheRestoreKeyPrefix,
  getCacheSaveKey,
+  getCodeQlVersionsForOverlayBaseDatabases,
 } from "./caching";
 import { OverlayDatabaseMode } from "./overlay-database-mode";

@@ -50,10 +52,9 @@ const defaultDownloadTestCase: DownloadOverlayBaseDatabaseTestCase = {
  resolveDatabaseOutput: { overlayBaseSpecifier: "20250626:XXX" },
 };

-const testDownloadOverlayBaseDatabaseFromCache = test.macro({
+const testDownloadOverlayBaseDatabaseFromCache = makeMacro({
  exec: async (
    t,
-    _title: string,
    partialTestCase: Partial<DownloadOverlayBaseDatabaseTestCase>,
    expectDownloadSuccess: boolean,
  ) => {
@@ -79,80 +80,59 @@ const testDownloadOverlayBaseDatabaseFromCache = test.macro({
        await fs.promises.writeFile(baseDatabaseOidsFile, JSON.stringify({}));
      }

-      const stubs: sinon.SinonStub[] = [];
+      sinon.stub(apiClient, "getAutomationID").resolves("test-automation-id/");

-      const getAutomationIDStub = sinon
-        .stub(apiClient, "getAutomationID")
-        .resolves("test-automation-id/");
-      stubs.push(getAutomationIDStub);
-
-      const isInTestModeStub = sinon
-        .stub(utils, "isInTestMode")
-        .returns(testCase.isInTestMode);
-      stubs.push(isInTestModeStub);
+      sinon.stub(utils, "isInTestMode").returns(testCase.isInTestMode);

      if (testCase.restoreCacheResult instanceof Error) {
-        const restoreCacheStub = sinon
+        sinon
          .stub(actionsCache, "restoreCache")
          .rejects(testCase.restoreCacheResult);
-        stubs.push(restoreCacheStub);
      } else {
-        const restoreCacheStub = sinon
+        sinon
          .stub(actionsCache, "restoreCache")
          .resolves(testCase.restoreCacheResult);
-        stubs.push(restoreCacheStub);
      }

-      const tryGetFolderBytesStub = sinon
+      sinon
        .stub(utils, "tryGetFolderBytes")
        .resolves(testCase.tryGetFolderBytesSucceeds ? 1024 * 1024 : undefined);
-      stubs.push(tryGetFolderBytesStub);

      const codeql = mockCodeQLVersion(testCase.codeQLVersion);

      if (testCase.resolveDatabaseOutput instanceof Error) {
-        const resolveDatabaseStub = sinon
+        sinon
          .stub(codeql, "resolveDatabase")
          .rejects(testCase.resolveDatabaseOutput);
-        stubs.push(resolveDatabaseStub);
      } else {
-        const resolveDatabaseStub = sinon
+        sinon
          .stub(codeql, "resolveDatabase")
          .resolves(testCase.resolveDatabaseOutput);
-        stubs.push(resolveDatabaseStub);
      }

-      try {
-        const result = await downloadOverlayBaseDatabaseFromCache(
-          codeql,
-          config,
-          logger,
-        );
+      const result = await downloadOverlayBaseDatabaseFromCache(
+        codeql,
+        config,
+        logger,
+      );

-        if (expectDownloadSuccess) {
-          t.truthy(result);
-        } else {
-          t.is(result, undefined);
-        }
-      } finally {
-        for (const stub of stubs) {
-          stub.restore();
-        }
+      if (expectDownloadSuccess) {
+        t.truthy(result);
+      } else {
+        t.is(result, undefined);
      }
    });
  },
-  title: (_, title) => `downloadOverlayBaseDatabaseFromCache: ${title}`,
+  title: (title) => `downloadOverlayBaseDatabaseFromCache: ${title}`,
 });

-test.serial(
-  testDownloadOverlayBaseDatabaseFromCache,
+testDownloadOverlayBaseDatabaseFromCache.serial(
  "returns stats when successful",
  {},
  true,
 );

-test.serial(
-  testDownloadOverlayBaseDatabaseFromCache,
+testDownloadOverlayBaseDatabaseFromCache.serial(
  "returns undefined when mode is OverlayDatabaseMode.OverlayBase",
  {
    overlayDatabaseMode: OverlayDatabaseMode.OverlayBase,
@@ -160,8 +140,7 @@ test.serial(
  false,
 );

-test.serial(
-  testDownloadOverlayBaseDatabaseFromCache,
+testDownloadOverlayBaseDatabaseFromCache.serial(
  "returns undefined when mode is OverlayDatabaseMode.None",
  {
    overlayDatabaseMode: OverlayDatabaseMode.None,
@@ -169,8 +148,7 @@ test.serial(
  false,
 );

-test.serial(
-  testDownloadOverlayBaseDatabaseFromCache,
+testDownloadOverlayBaseDatabaseFromCache.serial(
  "returns undefined when caching is disabled",
  {
    useOverlayDatabaseCaching: false,
@@ -178,8 +156,7 @@ test.serial(
  false,
 );

-test.serial(
-  testDownloadOverlayBaseDatabaseFromCache,
+testDownloadOverlayBaseDatabaseFromCache.serial(
  "returns undefined in test mode",
  {
    isInTestMode: true,
@@ -187,8 +164,7 @@ test.serial(
  false,
 );

-test.serial(
-  testDownloadOverlayBaseDatabaseFromCache,
+testDownloadOverlayBaseDatabaseFromCache.serial(
  "returns undefined when cache miss",
  {
    restoreCacheResult: undefined,
@@ -196,8 +172,7 @@ test.serial(
  false,
 );

-test.serial(
-  testDownloadOverlayBaseDatabaseFromCache,
+testDownloadOverlayBaseDatabaseFromCache.serial(
  "returns undefined when download fails",
  {
    restoreCacheResult: new Error("Download failed"),
@@ -205,8 +180,7 @@ test.serial(
  false,
 );

-test.serial(
-  testDownloadOverlayBaseDatabaseFromCache,
+testDownloadOverlayBaseDatabaseFromCache.serial(
  "returns undefined when downloaded database is invalid",
  {
    hasBaseDatabaseOidsFile: false,
@@ -214,8 +188,7 @@ test.serial(
  false,
 );

-test.serial(
-  testDownloadOverlayBaseDatabaseFromCache,
+testDownloadOverlayBaseDatabaseFromCache.serial(
  "returns undefined when downloaded database doesn't have an overlayBaseSpecifier",
  {
    resolveDatabaseOutput: {},
@@ -223,8 +196,7 @@ test.serial(
  false,
 );

-test.serial(
-  testDownloadOverlayBaseDatabaseFromCache,
+testDownloadOverlayBaseDatabaseFromCache.serial(
  "returns undefined when resolving database metadata fails",
  {
    resolveDatabaseOutput: new Error("Failed to resolve database metadata"),
@@ -232,8 +204,7 @@ test.serial(
  false,
 );

-test.serial(
-  testDownloadOverlayBaseDatabaseFromCache,
+testDownloadOverlayBaseDatabaseFromCache.serial(
  "returns undefined when filesystem error occurs",
  {
    tryGetFolderBytesSucceeds: false,
@@ -285,3 +256,160 @@ test.serial("overlay-base database cache keys remain stable", async (t) => {
    `Expected save key "${saveKey}" to start with restore key prefix "${restoreKeyPrefix}"`,
  );
 });
+
+test.serial(
+  "getCodeQlVersionsForOverlayBaseDatabases returns unique versions sorted latest first",
+  async (t) => {
+    const logger = getRunnerLogger(true);
+
+    sinon.stub(apiClient, "getAutomationID").resolves("test-automation-id/");
+    sinon.stub(apiClient, "listActionsCaches").resolves([
+      {
+        key: "codeql-overlay-base-database-1-c5666c509a2d9895-javascript_python-2.23.0-abc123-1-1",
+      },
+      {
+        key: "codeql-overlay-base-database-1-c5666c509a2d9895-javascript_python-2.24.1-def456-2-1",
+      },
+      {
+        key: "codeql-overlay-base-database-1-c5666c509a2d9895-javascript_python-2.23.0-ghi789-3-1",
+      },
+    ]);
+
+    const result = await getCodeQlVersionsForOverlayBaseDatabases(
+      ["javascript", "python"],
+      logger,
+    );
+    t.deepEqual(result, ["2.24.1", "2.23.0"]);
+  },
+);
+
+test.serial(
+  "getCodeQlVersionsForOverlayBaseDatabases returns empty list when no caches exist",
+  async (t) => {
+    const logger = getRunnerLogger(true);
+
+    sinon.stub(apiClient, "getAutomationID").resolves("test-automation-id/");
+    sinon.stub(apiClient, "listActionsCaches").resolves([]);
+
+    const result = await getCodeQlVersionsForOverlayBaseDatabases(
+      ["python"],
+      logger,
+    );
+    t.deepEqual(result, []);
+  },
+);
+
+test.serial(
+  "getCodeQlVersionsForOverlayBaseDatabases returns empty list when cache keys are unparseable",
+  async (t) => {
+    const logger = getRunnerLogger(true);
+
+    sinon.stub(apiClient, "getAutomationID").resolves("test-automation-id/");
+    sinon.stub(apiClient, "listActionsCaches").resolves([
+      {
+        key: "codeql-overlay-base-database-1-c5666c509a2d9895-python-malformed",
+      },
+      { key: undefined },
+    ]);
+
+    const result = await getCodeQlVersionsForOverlayBaseDatabases(
+      ["python"],
+      logger,
+    );
+    t.deepEqual(result, []);
+  },
+);
+
+test.serial(
+  "getCodeQlVersionsForOverlayBaseDatabases returns the single version when only one cache exists",
+  async (t) => {
+    const logger = getRunnerLogger(true);
+
+    sinon.stub(apiClient, "getAutomationID").resolves("test-automation-id/");
+    sinon.stub(apiClient, "listActionsCaches").resolves([
+      {
+        key: "codeql-overlay-base-database-1-c5666c509a2d9895-cpp-2.25.0-abc123-1-1",
+      },
+    ]);
+
+    const result = await getCodeQlVersionsForOverlayBaseDatabases(
+      ["cpp"],
+      logger,
+    );
+    t.deepEqual(result, ["2.25.0"]);
+  },
+);
+
+test.serial(
+  "getCodeQlVersionsForOverlayBaseDatabases resolves language aliases",
+  async (t) => {
+    const logger = getRunnerLogger(true);
+    // The alias `c++` should be resolved to "cpp" and match cache entries keyed with "cpp"
+
+    sinon.stub(apiClient, "getAutomationID").resolves("test-automation-id/");
+    sinon.stub(apiClient, "listActionsCaches").resolves([
+      {
+        key: "codeql-overlay-base-database-1-c5666c509a2d9895-cpp-2.25.0-abc123-1-1",
+      },
+    ]);
+
+    const result = await getCodeQlVersionsForOverlayBaseDatabases(
+      ["c++"],
+      logger,
+    );
+    t.deepEqual(result, ["2.25.0"]);
+  },
+);
+
+test.serial(
+  "getCodeQlVersionsForOverlayBaseDatabases de-duplicates resolved language aliases",
+  async (t) => {
+    const logger = getRunnerLogger(true);
+
+    sinon.stub(apiClient, "getAutomationID").resolves("test-automation-id/");
+    const listActionsCachesStub = sinon
+      .stub(apiClient, "listActionsCaches")
+      .resolves([
+        {
+          key: "codeql-overlay-base-database-1-c5666c509a2d9895-javascript_python-2.25.0-abc123-1-1",
+        },
+      ]);
+
+    const result = await getCodeQlVersionsForOverlayBaseDatabases(
+      ["javascript", "typescript", "Python", "python"],
+      logger,
+    );
+    t.deepEqual(result, ["2.25.0"]);
+    sinon.assert.calledOnceWithExactly(
+      listActionsCachesStub,
+      "codeql-overlay-base-database-1-c5666c509a2d9895-javascript_python-",
+    );
+  },
+);
+
+test.serial(
+  "getCodeQlVersionsForOverlayBaseDatabases ignores nightly versions with build metadata",
+  async (t) => {
+    const logger = getRunnerLogger(true);
+
+    sinon.stub(apiClient, "getAutomationID").resolves("test-automation-id/");
+    sinon.stub(apiClient, "listActionsCaches").resolves([
+      {
+        key: "codeql-overlay-base-database-1-c5666c509a2d9895-python-2.25.0-abc123-1-1",
+      },
+      {
+        // Nightly release with semver build metadata; should be ignored.
+        key: "codeql-overlay-base-database-1-c5666c509a2d9895-python-2.26.0+202604211234-def456-2-1",
+      },
+      {
+        key: "codeql-overlay-base-database-1-c5666c509a2d9895-python-2.24.0-ghi789-3-1",
+      },
+    ]);
+
+    const result = await getCodeQlVersionsForOverlayBaseDatabases(
+      ["python"],
+      logger,
+    );
+    t.deepEqual(result, ["2.25.0", "2.24.0"]);
+  },
+);
--- a/Show More
+++ b/Show More