Add NODE_ENV as safe environment variable

Mergeback v4.36.0 refs/heads/releases/v4 into main

.github/workflows/check-expected-release-files.yml

@@ -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

.github/workflows/codescanning-config-cli.yml

@@ -24,6 +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

.github/workflows/debug-artifacts-failure-safe.yml

@@ -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

.github/workflows/debug-artifacts-safe.yml

@@ -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

.github/workflows/pr-checks.yml

@@ -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
@@ -29,6 +33,10 @@ jobs:
     runs-on: ${{ matrix.os }}
     timeout-minutes: 45
 
+    concurrency:
+      cancel-in-progress: ${{ github.event_name == 'pull_request' || false }}
+      group: pr-checks-unit-tests-${{ github.ref }}-${{ github.event_name }}-${{ matrix.os }}-node${{ matrix['node-version'] }}
+
     steps:
       - name: Prepare git (Windows)
         if: runner.os == 'Windows'
@@ -67,22 +75,21 @@ jobs:
           sarif_file: eslint.sarif
           category: eslint
 
-  # Verifying the PR checks are up-to-date requires Node 24. The PR checks are not dependent
-  # on the main codebase and therefore do not need to be run as part of the same matrix that
-  # we use for the `unit-tests` job.
-  verify-pr-checks:
-    name: Verify PR checks
+  # These checks do not need to be run as part of the same matrix that we use for the `unit-tests`
+  # job.
+  other-checks:
+    name: Other checks
     if: github.triggering_actor != 'dependabot[bot]'
     permissions:
       contents: read
-    runs-on: ubuntu-slim
+    runs-on: ubuntu-latest
     timeout-minutes: 10
 
-    steps:
-      - name: Prepare git (Windows)
-        if: runner.os == 'Windows'
-        run: git config --global core.autocrlf false
+    concurrency:
+      cancel-in-progress: ${{ github.event_name == 'pull_request' || false }}
+      group: pr-checks-pr-checks-${{ github.ref }}-${{ github.event_name }}
 
+    steps:
       - name: Checkout repository
         uses: actions/checkout@v6
 
@@ -93,66 +100,134 @@ jobs:
           cache: 'npm'
 
       - name: Install dependencies
+        id: install-deps
         run: npm ci
 
       - name: Verify PR checks up to date
-        if: always()
+        if: ${{ !cancelled() && steps.install-deps.outcome == 'success' }}
         run: .github/workflows/script/verify-pr-checks.sh
 
       - name: Run pr-checks tests
-        if: always()
+        if: ${{ !cancelled() && steps.install-deps.outcome == 'success' }}
         working-directory: pr-checks
         run: npx tsx --test
 
-  check-node-version:
-    if: github.triggering_actor != 'dependabot[bot]' && startsWith(github.head_ref, 'backport-')
-    name: Check Action Node versions for Backport
-    runs-on: ubuntu-latest
-    timeout-minutes: 5
-    env:
-      BASE_REF: ${{ github.base_ref }}
-
-    permissions:
-      contents: read
-
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v6
-        with:
-          fetch-depth: 1
-
-      - id: head-version
-        name: Determine Node version for HEAD
+      - name: Verify all Actions use the same Node version
+        id: head-version
         run: |
-          if [[ ! -f ".nvmrc" ]]; then
-            echo "::error::Cannot find .nvmrc in the HEAD commit."
+          NODE_VERSION=$(find . -path "*/node_modules" -prune -o -name "action.yml" -exec yq -o=json '.runs.using' {} \; | jq -rs '[.[] | select(. != null and startswith("node"))] | unique | .[]')
+          echo "NODE_VERSION: ${NODE_VERSION}"
+          if [[ $(echo "$NODE_VERSION" | wc -l) -gt 1 ]]; then
+            echo "::error::More than one node version used in 'action.yml' files."
             exit 1
           fi
-
-          NODE_VERSION=$(cat .nvmrc)
-          echo "NODE_VERSION: ${NODE_VERSION}"
           echo "node_version=${NODE_VERSION}" >> $GITHUB_OUTPUT
 
-      - id: checkout-base
-        name: 'Backport: Check out base ref'
+      - name: Fetch base commit
+        id: fetch-base
+        # Forks and Dependabot PRs don't have permission to write comments, so skip the repo size
+        # check in those cases.
+        if: >-
+          github.event_name == 'pull_request' &&
+          github.event.pull_request.head.repo.full_name == github.repository &&
+          github.event.pull_request.user.login != 'dependabot[bot]'
+        env:
+          BASE_SHA: ${{ github.event.pull_request.base.sha }}
+          HEAD_SHA: ${{ github.event.pull_request.head.sha }}
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          # Compare against the merge base so the size delta reflects only the commits actually
+          # added by this PR, ignoring any changes that have landed on the base branch since the
+          # PR branched off.
+          merge_base=$(gh api "repos/$GITHUB_REPOSITORY/compare/$BASE_SHA...$HEAD_SHA" --jq '.merge_base_commit.sha')
+          echo "merge_base=$merge_base" >> "$GITHUB_OUTPUT"
+          git fetch --no-tags --depth=1 origin "$merge_base" "$HEAD_SHA"
+
+      - name: Check repo size
+        if: steps.fetch-base.outcome == 'success'
+        working-directory: pr-checks
+        env:
+          BASE_REF: ${{ github.event.pull_request.base.ref }}
+          BASE_SHA: ${{ steps.fetch-base.outputs.merge_base }}
+          HEAD_SHA: ${{ github.event.pull_request.head.sha }}
+          RUN_URL: ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}
+        run: npx tsx check-repo-size.ts --output-dir "$RUNNER_TEMP/repo-size"
+
+      - name: Upload repo size comment
+        if: steps.fetch-base.outcome == 'success'
+        uses: actions/upload-artifact@v7
+        with:
+          name: repo-size-comment
+          path: ${{ runner.temp }}/repo-size/
+          if-no-files-found: error
+
+      - name: 'Backport: Check out base ref'
+        id: checkout-base
+        if: ${{ startsWith(github.head_ref, 'backport-') }}
         uses: actions/checkout@v6
         with:
-          ref: ${{ env.BASE_REF }}
-          fetch-depth: 1
+          ref: ${{ github.base_ref }}
 
       - name: 'Backport: Verify Node versions unchanged'
+        if: steps.checkout-base.outcome == 'success'
         env:
           HEAD_VERSION: ${{ steps.head-version.outputs.node_version }}
         run: |
-          if [[ ! -f ".nvmrc" ]]; then
-            echo "::error::Cannot find .nvmrc in the base commit."
-            exit 1
-          fi
-
-          BASE_VERSION=$(cat .nvmrc)
+          BASE_VERSION=$(find . -path "*/node_modules" -prune -o -name "action.yml" -exec yq -o=json '.runs.using' {} \; | jq -rs '[.[] | select(. != null and startswith("node"))] | unique | .[]')
           echo "HEAD_VERSION: ${HEAD_VERSION}"
           echo "BASE_VERSION: ${BASE_VERSION}"
           if [[ "$BASE_VERSION" != "$HEAD_VERSION" ]]; then
             echo "::error::Cannot change the Node version of an Action in a backport PR."
             exit 1
           fi
+
+  post-repo-size-comment:
+    name: Post repo size comment
+    needs: other-checks
+    # Keep write permissions isolated from the job that checks out and tests PR code. This job only
+    # posts the candidate comment body produced by the read-only `pr-checks` job.
+    if: >-
+      github.event_name == 'pull_request' &&
+      github.event.pull_request.head.repo.full_name == github.repository &&
+      github.event.pull_request.user.login != 'dependabot[bot]' &&
+      needs.other-checks.result == 'success'
+    permissions:
+      contents: read
+      pull-requests: write
+    runs-on: ubuntu-slim
+    timeout-minutes: 10
+
+    concurrency:
+      cancel-in-progress: true
+      group: check-repo-size-${{ github.event.pull_request.number }}
+
+    steps:
+      - name: Download repo size comment
+        uses: actions/download-artifact@v8
+        with:
+          name: repo-size-comment
+          path: repo-size-comment
+
+      - name: Post repo size comment
+        env:
+          COMMENT_MARKER: "<!-- repo-size-diff-bot -->"
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          PR_NUMBER: ${{ github.event.pull_request.number }}
+        run: |
+          significant=$(jq -r '.significant' repo-size-comment/metadata.json)
+          comment_id=$(
+            gh api "repos/$GITHUB_REPOSITORY/issues/$PR_NUMBER/comments" \
+              --paginate \
+              --jq ".[] | select(.body | contains(\"$COMMENT_MARKER\")) | .id" \
+              | head -n 1
+          )
+
+          if [[ -n "$comment_id" ]]; then
+            echo "Updating existing comment $comment_id."
+            gh api --method PATCH "repos/$GITHUB_REPOSITORY/issues/comments/$comment_id" --field body=@repo-size-comment/body.md
+          elif [[ "$significant" == "true" ]]; then
+            echo "Creating new repo size comment."
+            gh api --method POST "repos/$GITHUB_REPOSITORY/issues/$PR_NUMBER/comments" --field body=@repo-size-comment/body.md
+          else
+            echo "Skipping repo size comment because the delta is below the threshold and no sticky comment exists."
+          fi

.github/workflows/python312-windows.yml

@@ -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

.github/workflows/query-filters.yml

@@ -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

.github/workflows/test-codeql-bundle-all.yml

@@ -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

.nvmrc

@@ -1 +0,0 @@
-24

CHANGELOG.md

@@ -4,8 +4,13 @@ See the [releases page](https://github.com/github/codeql-action/releases) for th
 
 ## [UNRELEASED]
 
+No user facing changes.
+
+## 4.36.0 - 22 May 2026
+
 - _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)
+- Update default CodeQL bundle version to [2.25.5](https://github.com/github/codeql-action/releases/tag/codeql-bundle-v2.25.5). [#3926](https://github.com/github/codeql-action/pull/3926)
 
 ## 4.35.5 - 15 May 2026
 

build.mjs

@@ -4,7 +4,6 @@ import { fileURLToPath } from "node:url";
 
 import * as esbuild from "esbuild";
 import { globSync } from "glob";
-import * as yaml from "js-yaml";
 
 import pkg from "./package.json" with { type: "json" };
 
@@ -28,70 +27,6 @@ const cleanPlugin = {
   },
 };
 
-/** A plugin that checks that the Node versions in all `action.yml` files are the same. */
-const checkNodeVersionsPlugin = {
-  name: "check-node-versions",
-  setup(build) {
-    build.onStart(async () => {
-      // Find all the `action.yml` files. We don't care about the stub in the repository root,
-      // since that is a `composite` action.
-      const actionSpecifications = globSync("*/action.yml");
-
-      // Track the Node versions we find for each file.
-      const nodeVersions = {};
-
-      // We will store the first Node version we find and use it to compare against the others.
-      // If there's any disagreement, we set `versionMismatch` to `true` and throw an error
-      // that includes all the discovered Node versions at the end.
-      let nodeVersion = undefined;
-      let versionMismatch = false;
-
-      for (const actionSpecification of actionSpecifications) {
-        // Read the contents of the action.yml file.
-        const contents = await readFile(actionSpecification, "utf-8");
-        const specification = yaml.load(contents);
-
-        // Find the `runs.using` value in the specification.
-        const using = specification.runs.using;
-        if (using === undefined || using === null) {
-          throw new Error(
-            `Couldn't find 'runs.using' in ${actionSpecification}`,
-          );
-        }
-
-        if (typeof using !== "string" || !using.startsWith("node")) {
-          throw new Error(
-            `Expected 'runs.using' to be a string starting with 'node' in ${actionSpecification}`,
-          );
-        }
-
-        if (nodeVersion === undefined) {
-          // First one we found: set it as the baseline.
-          nodeVersion = using;
-        } else if (nodeVersion !== using) {
-          // Disagreement: set `versionMismatch` to indicate that we should throw an error later.
-          versionMismatch = true;
-        }
-        nodeVersions[actionSpecification] = using;
-      }
-
-      // Throw an error if there was a version mismatch.
-      if (versionMismatch) {
-        throw new Error(
-          `More than one node version used in 'action.yml' files: ${JSON.stringify(nodeVersions)}`,
-        );
-      }
-
-      // Write the node version to `.nvmrc`.
-      await writeFile(
-        join(__dirname, ".nvmrc"),
-        nodeVersion.substring("node".length) + "\n",
-        "utf-8",
-      );
-    });
-  },
-};
-
 /**
  * Copy defaults.json to the output directory since other projects depend on it.
  *
@@ -143,7 +78,7 @@ const UPLOAD_LIB_SRC = "./src/upload-lib";
  *
  * 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.
  *
@@ -273,13 +208,7 @@ const context = await esbuild.context({
   outdir: OUT_DIR,
   platform: "node",
   external: ["./entry-points"],
-  plugins: [
-    cleanPlugin,
-    checkNodeVersionsPlugin,
-    copyDefaultsPlugin,
-    entryPointsPlugin,
-    onEndPlugin,
-  ],
+  plugins: [cleanPlugin, copyDefaultsPlugin, entryPointsPlugin, onEndPlugin],
   target: ["node20"],
   define: {
     __CODEQL_ACTION_VERSION__: JSON.stringify(pkg.version),

eslint.config.mjs

@@ -140,6 +140,18 @@ export default [
       "no-async-foreach/no-async-foreach": "error",
       "no-sequences": "error",
       "no-shadow": "off",
+
+      // A basic check that we don't use `exportVariable` from `@actions/core`. This rule depends on
+      // the module being imported as `core`, but that is a good enough check for us.
+      "no-restricted-syntax": [
+        "error",
+        {
+          selector:
+            "MemberExpression[object.name='core'][property.name='exportVariable']",
+          message: "Use `exportVariable` from `environment.ts` instead.",
+        },
+      ],
+
       // This is overly restrictive with unsetting `EnvVar`s
       "@typescript-eslint/no-dynamic-delete": "off",
       "@typescript-eslint/no-shadow": "error",
@@ -157,6 +169,15 @@ export default [
       ],
     },
   },
+  {
+    files: ["src/environment.ts"],
+
+    // We allow `exportVariable` from `@actions/core` to be used in this file
+    // since it defines the wrapper around it that other modules use.
+    rules: {
+      "no-restricted-syntax": "off",
+    },
+  },
   {
     files: ["**/*.ts", "**/*.js"],
 

lib/defaults.json

@@ -1,6 +1,6 @@
 {
-  "bundleVersion": "codeql-bundle-v2.25.4",
-  "cliVersion": "2.25.4",
-  "priorBundleVersion": "codeql-bundle-v2.25.3",
-  "priorCliVersion": "2.25.3"
+  "bundleVersion": "codeql-bundle-v2.25.5",
+  "cliVersion": "2.25.5",
+  "priorBundleVersion": "codeql-bundle-v2.25.4",
+  "priorCliVersion": "2.25.4"
 }

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "codeql",
-  "version": "4.36.0",
+  "version": "4.36.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "codeql",
-      "version": "4.36.0",
+      "version": "4.36.1",
       "license": "MIT",
       "workspaces": [
         "pr-checks"
@@ -3795,9 +3795,9 @@
       "license": "MIT"
     },
     "node_modules/brace-expansion": {
-      "version": "1.1.13",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.13.tgz",
-      "integrity": "sha512-9ZLprWS6EENmhEOpjCYW2c8VkmOvckIJZfkr7rBW6dObmfgJ/L1GpSYW5Hpo9lDz4D1+n0Ckz8rU7FwHDQiG/w==",
+      "version": "1.1.14",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.14.tgz",
+      "integrity": "sha512-MWPGfDxnyzKU7rNOW9SP/c50vi3xrmrua/+6hfPbCS2ABNWfx24vPidzvC7krjU/RTo235sV776ymlsMtGKj8g==",
       "license": "MIT",
       "dependencies": {
         "balanced-match": "^1.0.0",
@@ -5122,9 +5122,9 @@
       }
     },
     "node_modules/eslint-plugin-import-x/node_modules/brace-expansion": {
-      "version": "5.0.5",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-5.0.5.tgz",
-      "integrity": "sha512-VZznLgtwhn+Mact9tfiwx64fA9erHH/MCXEUfB/0bX/6Fz6ny5EGTXYltMocqg4xFAQZtnO3DHWWXi8RiuN7cQ==",
+      "version": "5.0.6",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-5.0.6.tgz",
+      "integrity": "sha512-kLpxurY4Z4r9sgMsyG0Z9uzsBlgiU/EFKhj/h91/8yHu0edo7XuixOIH3VcJ8kkxs6/jPzoI6U9Vj3WqbMQ94g==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -6078,9 +6078,9 @@
       }
     },
     "node_modules/glob/node_modules/brace-expansion": {
-      "version": "5.0.5",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-5.0.5.tgz",
-      "integrity": "sha512-VZznLgtwhn+Mact9tfiwx64fA9erHH/MCXEUfB/0bX/6Fz6ny5EGTXYltMocqg4xFAQZtnO3DHWWXi8RiuN7cQ==",
+      "version": "5.0.6",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-5.0.6.tgz",
+      "integrity": "sha512-kLpxurY4Z4r9sgMsyG0Z9uzsBlgiU/EFKhj/h91/8yHu0edo7XuixOIH3VcJ8kkxs6/jPzoI6U9Vj3WqbMQ94g==",
       "license": "MIT",
       "dependencies": {
         "balanced-match": "^4.0.2"

package.json

@@ -1,6 +1,6 @@
 {
   "name": "codeql",
-  "version": "4.36.0",
+  "version": "4.36.1",
   "private": true,
   "description": "CodeQL action",
   "scripts": {

pr-checks/check-repo-size.test.ts

@@ -0,0 +1,259 @@
+#!/usr/bin/env npx tsx
+
+/*
+Tests for check-repo-size.ts.
+*/
+
+import * as assert from "node:assert/strict";
+import { execFileSync } from "node:child_process";
+import { randomBytes } from "node:crypto";
+import * as fs from "node:fs";
+import * as os from "node:os";
+import * as path from "node:path";
+import { afterEach, beforeEach, describe, it } from "node:test";
+
+import {
+  COMMENT_MARKER,
+  DEFAULT_BASE_REF,
+  buildCommentBody,
+  formatBytes,
+  formatPercent,
+  isDeltaSignificant,
+  measureArchiveSize,
+  readArgs,
+} from "./check-repo-size";
+
+describe("formatBytes", async () => {
+  const cases: Array<[number, boolean, string]> = [
+    // Unsigned values, including sub-KiB amounts which round to 0.00.
+    [0, false, "0.00 KiB"],
+    [512, false, "0.50 KiB"],
+    [1024, false, "1.00 KiB"],
+    [1024 * 1024, false, "1024.00 KiB"],
+    [2 * 1024 * 1024, false, "2048.00 KiB"],
+    // Negative values always use a leading minus.
+    [-2 * 1024 * 1024, false, "-2048.00 KiB"],
+    // signed=true prepends a + to non-negative values.
+    [0, true, "+0.00 KiB"],
+    [2 * 1024 * 1024, true, "+2048.00 KiB"],
+    [-2 * 1024 * 1024, true, "-2048.00 KiB"],
+  ];
+  for (const [bytes, signed, expected] of cases) {
+    await it(`formats ${bytes} (signed=${signed}) as ${expected}`, () => {
+      assert.equal(formatBytes(bytes, signed), expected);
+    });
+  }
+});
+
+describe("formatPercent", async () => {
+  await it("formats positive fractions with a leading +", () => {
+    assert.equal(formatPercent(0.1), "+10.00%");
+    assert.equal(formatPercent(0.0123), "+1.23%");
+  });
+
+  await it("formats negative fractions with a leading -", () => {
+    assert.equal(formatPercent(-0.1), "-10.00%");
+  });
+
+  await it("formats zero without a sign", () => {
+    assert.equal(formatPercent(0), "0.00%");
+  });
+});
+
+describe("isDeltaSignificant", async () => {
+  const cases: Array<[number, number, number, boolean]> = [
+    // At and above threshold (both signs).
+    [100, 1000, 0.1, true],
+    [101, 1000, 0.1, true],
+    [-100, 1000, 0.1, true],
+    // Below threshold (both signs, plus exact zero).
+    [99, 1000, 0.1, false],
+    [-99, 1000, 0.1, false],
+    [0, 1000, 0.1, false],
+  ];
+  for (const [delta, base, fraction, expected] of cases) {
+    await it(`returns ${expected} for delta=${delta}, base=${base}, fraction=${fraction}`, () => {
+      assert.equal(isDeltaSignificant(delta, base, fraction), expected);
+    });
+  }
+});
+
+describe("buildCommentBody", async () => {
+  await it("includes the marker, the base/PR/delta rows, and the run URL", () => {
+    const body = buildCommentBody({
+      baseRef: "main",
+      baseSize: 2_000_000,
+      prSize: 2_300_000,
+      runUrl: "https://example.test/run",
+    });
+
+    assert.match(body, new RegExp(`^${escapeRegExp(COMMENT_MARKER)}`));
+    assert.match(body, /Base \(`main`\) \| 1953\.13 KiB \(2000000 bytes\)/);
+    assert.match(body, /This PR \| 2246\.09 KiB \(2300000 bytes\)/);
+    assert.match(
+      body,
+      /\*\*Delta\*\* \| \*\*\+292\.97 KiB \(\+300000 bytes, \+15\.00%\)\*\*/,
+    );
+    assert.match(body, /\[workflow run\]\(https:\/\/example\.test\/run\)/);
+  });
+
+  await it("formats negative deltas with a leading minus and omits the run URL when missing", () => {
+    const body = buildCommentBody({
+      baseRef: "main",
+      baseSize: 2_000_000,
+      prSize: 1_800_000,
+    });
+    assert.match(
+      body,
+      /\*\*Delta\*\* \| \*\*-195\.31 KiB \(-200000 bytes, -10\.00%\)\*\*/,
+    );
+    assert.doesNotMatch(body, /workflow run/);
+  });
+});
+
+describe("readArgs", async () => {
+  await it("defaults the base ref and head commit for local runs", () => {
+    const originalEnv = process.env;
+    const originalArgv = process.argv;
+
+    try {
+      process.env = {};
+      process.argv = ["node", "check-repo-size.ts", "--output-dir", "/tmp/out"];
+
+      const args = readArgs();
+
+      assert.equal(args.baseRef, DEFAULT_BASE_REF);
+      assert.equal(args.baseCommitish, `origin/${DEFAULT_BASE_REF}`);
+      assert.equal(args.headCommitish, "HEAD");
+      assert.equal(args.outputDir, "/tmp/out");
+      assert.equal(args.runUrl, undefined);
+    } finally {
+      process.env = originalEnv;
+      process.argv = originalArgv;
+    }
+  });
+
+  await it("uses the base and head SHAs when provided by the workflow", () => {
+    const originalEnv = process.env;
+    const originalArgv = process.argv;
+
+    try {
+      process.env = {
+        BASE_REF: "main",
+        BASE_SHA: "abc123",
+        HEAD_SHA: "def456",
+        RUN_URL: "https://example.test/run",
+      };
+      process.argv = ["node", "check-repo-size.ts", "--output-dir", "/tmp/out"];
+
+      const args = readArgs();
+
+      assert.equal(args.baseRef, "main");
+      assert.equal(args.baseCommitish, "abc123");
+      assert.equal(args.headCommitish, "def456");
+      assert.equal(args.outputDir, "/tmp/out");
+      assert.equal(args.runUrl, "https://example.test/run");
+    } finally {
+      process.env = originalEnv;
+      process.argv = originalArgv;
+    }
+  });
+
+  await it("throws when --output-dir is missing", () => {
+    const originalEnv = process.env;
+    const originalArgv = process.argv;
+
+    try {
+      process.env = {};
+      process.argv = ["node", "check-repo-size.ts"];
+      assert.throws(() => readArgs(), /--output-dir is required/);
+    } finally {
+      process.env = originalEnv;
+      process.argv = originalArgv;
+    }
+  });
+});
+
+let repoDir: string;
+
+beforeEach(() => {
+  repoDir = fs.mkdtempSync(path.join(os.tmpdir(), "check-repo-size-test-"));
+  execFileSync("git", ["init", "--initial-branch=main", "-q"], {
+    cwd: repoDir,
+  });
+  execFileSync("git", ["config", "user.email", "test@example.test"], {
+    cwd: repoDir,
+  });
+  execFileSync("git", ["config", "user.name", "Test"], { cwd: repoDir });
+  execFileSync("git", ["config", "commit.gpgsign", "false"], { cwd: repoDir });
+});
+
+afterEach(() => {
+  fs.rmSync(repoDir, { recursive: true, force: true });
+});
+
+function commit(name: string, content: string, message: string) {
+  fs.writeFileSync(path.join(repoDir, name), content);
+  execFileSync("git", ["add", name], { cwd: repoDir });
+  execFileSync("git", ["commit", "-q", "-m", message], { cwd: repoDir });
+}
+
+describe("measureArchiveSize", async () => {
+  await it("returns a positive byte count for a non-empty repo", async () => {
+    commit("a.txt", "hello world\n", "first");
+    const size = await measureArchiveSize("HEAD", repoDir);
+    assert.ok(size > 0, `expected size > 0, got ${size}`);
+  });
+
+  await it("returns the same size on repeated runs (deterministic)", async () => {
+    commit("a.txt", "hello world\n", "first");
+    const a = await measureArchiveSize("HEAD", repoDir);
+    const b = await measureArchiveSize("HEAD", repoDir);
+    assert.equal(a, b);
+  });
+
+  await it("returns a larger size when more content is added", async () => {
+    commit("a.txt", "hello world\n", "first");
+    const small = await measureArchiveSize("HEAD", repoDir);
+
+    // Use random bytes so the new content is incompressible and the archive
+    // is guaranteed to grow even after gzip.
+    commit("b.bin", randomBytes(8192).toString("base64"), "second");
+    const big = await measureArchiveSize("HEAD", repoDir);
+    assert.ok(
+      big > small,
+      `expected ${big} > ${small} after adding more content`,
+    );
+  });
+
+  await it("ignores untracked files (e.g. node_modules)", async () => {
+    commit("a.txt", "hello\n", "first");
+    commit(".gitignore", "node_modules/\n", "ignore node_modules");
+    const sizeBefore = await measureArchiveSize("HEAD", repoDir);
+
+    fs.mkdirSync(path.join(repoDir, "node_modules"));
+    fs.writeFileSync(
+      path.join(repoDir, "node_modules", "huge.bin"),
+      "x".repeat(1_000_000),
+    );
+
+    const sizeAfter = await measureArchiveSize("HEAD", repoDir);
+    assert.equal(
+      sizeAfter,
+      sizeBefore,
+      "untracked node_modules should not affect the archive size",
+    );
+  });
+
+  await it("rejects when the ref does not exist", async () => {
+    commit("a.txt", "hello\n", "first");
+    await assert.rejects(
+      () => measureArchiveSize("does-not-exist", repoDir),
+      /git archive does-not-exist exited with code/,
+    );
+  });
+});
+
+function escapeRegExp(s: string): string {
+  return s.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
+}

pr-checks/check-repo-size.ts

@@ -0,0 +1,223 @@
+#!/usr/bin/env npx tsx
+
+/*
+Measures the difference in the `.tar.gz`'d checkout size of the repo between the PR head and the PR
+base. This size is relevant because it corresponds to the duration of the "Download action
+repository" step that happens at the start of every job that uses this Action.
+
+Writes the candidate sticky-comment body and a small metadata file to `--output-dir`. A separate
+workflow job consumes those artifacts and decides whether to create or update a PR comment.
+*/
+
+import { spawn } from "node:child_process";
+import * as fs from "node:fs";
+import * as path from "node:path";
+import { parseArgs } from "node:util";
+
+import { REPO_ROOT } from "./config";
+
+/** Hidden marker used to find the existing sticky comment on a PR. */
+export const COMMENT_MARKER = "<!-- repo-size-diff-bot -->";
+
+export const DEFAULT_BASE_REF = "main";
+
+/**
+ * Fraction of the base archive size at which a delta is considered significant enough to warrant
+ * a new sticky comment. We always update an existing comment regardless, so the comment stays in
+ * sync as the diff evolves.
+ */
+export const SIGNIFICANT_DELTA_FRACTION = 0.1;
+
+/**
+ * Stream `git archive --format=tar.gz <ref>` and count the compressed bytes.
+ *
+ * `git archive` only includes tracked files, so untracked directories like `node_modules` and
+ * `build` aren't counted in the size downloaded when starting up a CodeQL job.
+ */
+export async function measureArchiveSize(
+  ref: string,
+  cwd: string,
+): Promise<number> {
+  const git = spawn("git", ["archive", "--format=tar.gz", ref], { cwd });
+
+  let stderr = "";
+  git.stderr.on("data", (chunk: Buffer) => {
+    stderr += chunk.toString();
+  });
+
+  let size = 0;
+  git.stdout.on("data", (chunk: Buffer) => {
+    size += chunk.length;
+  });
+
+  const exitCode = await new Promise<number>((resolve, reject) => {
+    git.on("error", reject);
+    git.on("close", resolve);
+  });
+
+  if (exitCode !== 0) {
+    throw new Error(
+      `git archive ${ref} exited with code ${exitCode}: ${stderr.trim()}`,
+    );
+  }
+  return size;
+}
+
+/**
+ * Format a byte count as KiB. If `signed` is true, a leading `+` is prepended for non-negative
+ * values so gains and losses are visually distinct.
+ */
+export function formatBytes(bytes: number, signed = false): string {
+  const sign = bytes < 0 ? "-" : signed ? "+" : "";
+  const kib = Math.abs(bytes) / 1024;
+  return `${sign}${kib.toFixed(2)} KiB`;
+}
+
+/** Format a fraction as a signed percentage with 2 decimal places. */
+export function formatPercent(fraction: number): string {
+  const pct = fraction * 100;
+  const sign = pct > 0 ? "+" : "";
+  return `${sign}${pct.toFixed(2)}%`;
+}
+
+export interface CommentBodyOptions {
+  baseRef: string;
+  baseSize: number;
+  prSize: number;
+  /** Optional URL of the workflow run, included in the comment footer. */
+  runUrl?: string;
+}
+
+export function buildCommentBody(opts: CommentBodyOptions): string {
+  const { baseRef, baseSize, prSize, runUrl } = opts;
+  const delta = prSize - baseSize;
+  const signedDelta = delta >= 0 ? `+${delta}` : `${delta}`;
+  const runUrlLine = runUrl
+    ? ` See the [workflow run](${runUrl}) for details.`
+    : "";
+
+  return [
+    COMMENT_MARKER,
+    "### Repository checkout size",
+    "",
+    "| | Compressed archive size |",
+    "|---|---|",
+    `| Base (\`${baseRef}\`) | ${formatBytes(baseSize)} (${baseSize} bytes) |`,
+    `| This PR | ${formatBytes(prSize)} (${prSize} bytes) |`,
+    `| **Delta** | **${formatBytes(delta, true)} (${signedDelta} bytes, ${formatPercent(delta / baseSize)})** |`,
+    "",
+    "Sizes are measured by streaming `git archive --format=tar.gz <ref>`, " +
+      "which includes tracked files and excludes untracked files such as " +
+      "`node_modules`. The compressed checkout is " +
+      "downloaded by every consumer of this Action, so changes here directly " +
+      `affect Action download time.${runUrlLine}`,
+  ].join("\n");
+}
+
+/**
+ * Returns true when the absolute delta is at least `fraction` of the base size. Both increases and
+ * decreases are considered significant, so we report wins as well as losses.
+ */
+export function isDeltaSignificant(
+  delta: number,
+  baseSize: number,
+  fraction: number,
+): boolean {
+  return Math.abs(delta) >= baseSize * fraction;
+}
+
+interface MainArgs {
+  /** Base ref of the PR. Defaults to `main`. Used as the label in the PR comment. */
+  baseRef: string;
+  /** Base commit-ish to archive. Defaults to `origin/<baseRef>` for local runs. */
+  baseCommitish: string;
+  /** Head commit-ish to archive. Defaults to `HEAD` for local runs. */
+  headCommitish: string;
+  /** Optional URL of the workflow run, surfaced in the comment footer. */
+  runUrl?: string;
+  /** Directory where `body.md` and `metadata.json` are written. */
+  outputDir: string;
+}
+
+export function readArgs(): MainArgs {
+  const { values } = parseArgs({
+    options: {
+      "output-dir": { type: "string" },
+    },
+    strict: true,
+  });
+
+  const outputDir = values["output-dir"];
+  if (!outputDir) {
+    throw new Error("--output-dir is required");
+  }
+
+  const baseRef = process.env.BASE_REF ?? DEFAULT_BASE_REF;
+  const baseCommitish = process.env.BASE_SHA ?? `origin/${baseRef}`;
+  const headCommitish = process.env.HEAD_SHA ?? "HEAD";
+
+  return {
+    baseRef,
+    baseCommitish,
+    headCommitish,
+    runUrl: process.env.RUN_URL,
+    outputDir,
+  };
+}
+
+async function main(): Promise<number> {
+  const args = readArgs();
+
+  console.log(`Measuring base archive size for ${args.baseCommitish}...`);
+  const baseSize = await measureArchiveSize(args.baseCommitish, REPO_ROOT);
+  console.log(`  ${baseSize} bytes`);
+
+  console.log(`Measuring PR archive size for ${args.headCommitish}...`);
+  const prSize = await measureArchiveSize(args.headCommitish, REPO_ROOT);
+  console.log(`  ${prSize} bytes`);
+
+  const delta = prSize - baseSize;
+  const significant = isDeltaSignificant(
+    delta,
+    baseSize,
+    SIGNIFICANT_DELTA_FRACTION,
+  );
+  console.log(
+    `Delta: ${delta} bytes (significant=${significant}, threshold=${(
+      SIGNIFICANT_DELTA_FRACTION * 100
+    ).toFixed(2)}%)`,
+  );
+
+  const body = buildCommentBody({
+    baseRef: args.baseRef,
+    baseSize,
+    prSize,
+    runUrl: args.runUrl,
+  });
+
+  fs.mkdirSync(args.outputDir, { recursive: true });
+  fs.writeFileSync(path.join(args.outputDir, "body.md"), body);
+  fs.writeFileSync(
+    path.join(args.outputDir, "metadata.json"),
+    `${JSON.stringify(
+      { significant, baseRef: args.baseRef, baseSize, prSize, delta },
+      null,
+      2,
+    )}\n`,
+  );
+  console.log(`Wrote body.md and metadata.json to ${args.outputDir}.`);
+  return 0;
+}
+
+async function run(): Promise<void> {
+  try {
+    process.exit(await main());
+  } catch (err) {
+    console.error(err instanceof Error ? err.message : String(err));
+    process.exit(1);
+  }
+}
+
+if (require.main === module) {
+  void run();
+}

pr-checks/config.ts

@@ -6,14 +6,17 @@ export const OLDEST_SUPPORTED_MAJOR_VERSION = 3;
 /** The `pr-checks` directory. */
 export const PR_CHECKS_DIR = __dirname;
 
+/** The repository root. */
+export const REPO_ROOT = path.join(PR_CHECKS_DIR, "..");
+
 /** The path of the file configuring which checks shouldn't be required. */
 export const PR_CHECK_EXCLUDED_FILE = path.join(PR_CHECKS_DIR, "excluded.yml");
 
 /** The path to the esbuild metadata file. */
-export const BUNDLE_METADATA_FILE = path.join(PR_CHECKS_DIR, "..", "meta.json");
+export const BUNDLE_METADATA_FILE = path.join(REPO_ROOT, "meta.json");
 
 /** The `src` directory. */
-const SOURCE_ROOT = path.join(PR_CHECKS_DIR, "..", "src");
+const SOURCE_ROOT = path.join(REPO_ROOT, "src");
 
 /** The path to the built-in languages file. */
 export const BUILTIN_LANGUAGES_FILE = path.join(

pr-checks/excluded.yml

@@ -1,16 +1,17 @@
 # PR checks to exclude from required checks
 contains:
-  - "https://"
-  - "Update"
   - "ESLint"
-  - "update"
+  - "https://"
   - "test-setup-python-scripts"
+  - "update"
+  - "Update"
 is:
+  - "Agent"
+  - "check-expected-release-files"
+  - "Cleanup artifacts"
   - "CodeQL"
   - "Dependabot"
-  - "check-expected-release-files"
-  - "Agent"
-  - "Cleanup artifacts"
+  - "Label PR with size"
+  - "Post repo size comment"
   - "Prepare"
   - "Upload results"
-  - "Label PR with size"

queries/default-setup-environment-variables.ql

@@ -23,7 +23,8 @@ predicate isSafeForDefaultSetup(string envVar) {
       "GITHUB_BASE_REF", "GITHUB_EVENT_NAME", "GITHUB_JOB", "GITHUB_RUN_ATTEMPT", "GITHUB_RUN_ID",
       "GITHUB_SHA", "GITHUB_REPOSITORY", "GITHUB_SERVER_URL", "GITHUB_TOKEN", "GITHUB_WORKFLOW",
       "GITHUB_WORKSPACE", "GOFLAGS", "ImageVersion", "JAVA_TOOL_OPTIONS", "RUNNER_ARCH",
-      "RUNNER_ENVIRONMENT", "RUNNER_NAME", "RUNNER_OS", "RUNNER_TEMP", "RUNNER_TOOL_CACHE"
+      "RUNNER_ENVIRONMENT", "RUNNER_NAME", "RUNNER_OS", "RUNNER_TEMP", "RUNNER_TOOL_CACHE",
+      "NODE_ENV"
     ]
 }
 
@@ -43,6 +44,7 @@ predicate envVarRead(DataFlow::Node node, string envVar) {
 from DataFlow::Node read, string envVar
 where
   envVarRead(read, envVar) and
+  read.getFile().getRelativePath().matches("src/%") and
   not read.getFile().getBaseName().matches("%.test.ts") and
   not isSafeForDefaultSetup(envVar)
 select read,

src/analyze-action.ts

@@ -28,7 +28,7 @@ import {
   DependencyCacheUploadStatusReport,
   uploadDependencyCaches,
 } from "./dependency-caching";
-import { EnvVar } from "./environment";
+import { EnvVar, exportVariable } from "./environment";
 import { initFeatures } from "./feature-flags";
 import { BuiltInLanguage } from "./languages";
 import { getActionsLogger, Logger } from "./logging";
@@ -284,7 +284,7 @@ async function run(startedAt: Date) {
 
     const apiDetails = getApiDetails();
     const outputDir = actionsUtil.getRequiredInput("output");
-    core.exportVariable(EnvVar.SARIF_RESULTS_OUTPUT_DIR, outputDir);
+    exportVariable(EnvVar.SARIF_RESULTS_OUTPUT_DIR, outputDir);
     const threads = util.getThreadsFlag(
       actionsUtil.getOptionalInput("threads") || process.env["CODEQL_THREADS"],
       logger,
@@ -444,7 +444,7 @@ async function run(startedAt: Date) {
         `expect-error input was set to true but no error was thrown.`,
       );
     }
-    core.exportVariable(EnvVar.ANALYZE_DID_COMPLETE_SUCCESSFULLY, "true");
+    exportVariable(EnvVar.ANALYZE_DID_COMPLETE_SUCCESSFULLY, "true");
   } catch (unwrappedError) {
     const error = util.wrapError(unwrappedError);
     if (

src/api-client.ts

@@ -3,7 +3,7 @@ import * as githubUtils from "@actions/github/lib/utils";
 import * as retry from "@octokit/plugin-retry";
 
 import { getActionVersion, getRequiredInput } from "./actions-util";
-import { EnvVar } from "./environment";
+import { EnvVar, exportVariable } from "./environment";
 import { Logger } from "./logging";
 import { getRepositoryNwo, RepositoryNwo } from "./repository";
 import {
@@ -216,7 +216,7 @@ export async function getAnalysisKey(): Promise<string> {
   const jobName = getRequiredEnvParam("GITHUB_JOB");
 
   analysisKey = `${workflowPath}:${jobName}`;
-  core.exportVariable(EnvVar.ANALYSIS_KEY, analysisKey);
+  exportVariable(EnvVar.ANALYSIS_KEY, analysisKey);
   return analysisKey;
 }
 

src/autobuild-action.ts

@@ -9,7 +9,7 @@ import { getGitHubVersion } from "./api-client";
 import { determineAutobuildLanguages, runAutobuild } from "./autobuild";
 import { getCodeQL } from "./codeql";
 import { Config, getConfig } from "./config-utils";
-import { EnvVar } from "./environment";
+import { EnvVar, exportVariable } from "./environment";
 import { Language } from "./languages";
 import { Logger, getActionsLogger } from "./logging";
 import {
@@ -137,7 +137,7 @@ async function run(startedAt: Date) {
     return;
   }
 
-  core.exportVariable(EnvVar.AUTOBUILD_DID_COMPLETE_SUCCESSFULLY, "true");
+  exportVariable(EnvVar.AUTOBUILD_DID_COMPLETE_SUCCESSFULLY, "true");
 
   await sendCompletedStatusReport(config, logger, startedAt, languages ?? []);
 }

src/autobuild.ts

@@ -1,11 +1,9 @@
-import * as core from "@actions/core";
-
 import { getTemporaryDirectory, getWorkflowEventName } from "./actions-util";
 import { getGitHubVersion } from "./api-client";
 import { CodeQL, getCodeQL } from "./codeql";
 import * as configUtils from "./config-utils";
 import { DocUrl } from "./doc-url";
-import { EnvVar } from "./environment";
+import { EnvVar, exportVariable } from "./environment";
 import { Feature, featureConfig, initFeatures } from "./feature-flags";
 import { BuiltInLanguage, Language } from "./languages";
 import { Logger } from "./logging";
@@ -136,16 +134,16 @@ export async function setupCppAutobuild(codeql: CodeQL, logger: Logger) {
             : ""
         }`,
       );
-      core.exportVariable(envVar, "false");
+      exportVariable(envVar, "false");
     } else {
       logger.info(
         `Enabling ${featureName}. This can be disabled by setting the ${envVar} environment variable to 'false'. See ${DocUrl.DEFINE_ENV_VARIABLES} for more information.`,
       );
-      core.exportVariable(envVar, "true");
+      exportVariable(envVar, "true");
     }
   } else {
     logger.info(`Disabling ${featureName}.`);
-    core.exportVariable(envVar, "false");
+    exportVariable(envVar, "false");
   }
 }
 
@@ -165,7 +163,7 @@ export async function runAutobuild(
     await codeQL.runAutobuild(config, language);
   }
   if (language === BuiltInLanguage.go) {
-    core.exportVariable(EnvVar.DID_AUTOBUILD_GOLANG, "true");
+    exportVariable(EnvVar.DID_AUTOBUILD_GOLANG, "true");
   }
   logger.endGroup();
 }

src/codeql.ts

@@ -15,7 +15,7 @@ import * as api from "./api-client";
 import { CliError, wrapCliConfigurationError } from "./cli-errors";
 import { appendExtraQueryExclusions, type Config } from "./config-utils";
 import { DocUrl } from "./doc-url";
-import { EnvVar } from "./environment";
+import { EnvVar, exportVariable } from "./environment";
 import {
   CodeQLDefaultVersionInfo,
   Feature,
@@ -1096,7 +1096,7 @@ async function getCodeQLForCmd(
         }' by 'github/codeql-action/*@v${getActionVersion()}' in your code scanning workflow to ` +
         "continue using this version of the CodeQL Action.",
     );
-    core.exportVariable(EnvVar.SUPPRESS_DEPRECATED_SOON_WARNING, "true");
+    exportVariable(EnvVar.SUPPRESS_DEPRECATED_SOON_WARNING, "true");
   }
   return codeql;
 }

src/config-utils.ts

@@ -2,7 +2,6 @@ import * as fs from "fs";
 import * as path from "path";
 import { performance } from "perf_hooks";
 
-import * as core from "@actions/core";
 import * as yaml from "js-yaml";
 
 import {
@@ -32,7 +31,7 @@ import {
   makeTelemetryDiagnostic,
 } from "./diagnostics";
 import { prepareDiffInformedAnalysis } from "./diff-informed-analysis-utils";
-import { EnvVar } from "./environment";
+import { EnvVar, exportVariable } from "./environment";
 import * as errorMessages from "./error-messages";
 import { Feature, FeatureEnablement } from "./feature-flags";
 import {
@@ -1045,10 +1044,10 @@ async function setCppTrapCachingEnvironmentVariables(
       );
     } else if (config.trapCaches[BuiltInLanguage.cpp]) {
       logger.info("Enabling TRAP caching for C/C++.");
-      core.exportVariable(envVar, "true");
+      exportVariable(envVar, "true");
     } else {
       logger.debug(`Disabling TRAP caching for C/C++.`);
-      core.exportVariable(envVar, "false");
+      exportVariable(envVar, "false");
     }
   }
 }

src/debug-artifacts.ts

@@ -11,7 +11,7 @@ import { dbIsFinalized } from "./analyze";
 import { scanArtifactsForTokens } from "./artifact-scanner";
 import { type CodeQL } from "./codeql";
 import { Config } from "./config-utils";
-import { EnvVar } from "./environment";
+import { EnvVar, exportVariable } from "./environment";
 import * as json from "./json";
 import { Language } from "./languages";
 import { Logger, withGroup } from "./logging";
@@ -330,7 +330,7 @@ export async function uploadArtifacts(
   // some issues early.
   if (isInTestMode()) {
     await scanArtifactsForTokens(toUpload, logger);
-    core.exportVariable("CODEQL_ACTION_ARTIFACT_SCAN_FINISHED", "true");
+    exportVariable("CODEQL_ACTION_ARTIFACT_SCAN_FINISHED", "true");
   }
 
   const suffix = getArtifactSuffix(getOptionalInput("matrix"));

src/defaults.json

@@ -1,6 +1,6 @@
 {
-  "bundleVersion": "codeql-bundle-v2.25.4",
-  "cliVersion": "2.25.4",
-  "priorBundleVersion": "codeql-bundle-v2.25.3",
-  "priorCliVersion": "2.25.3"
+  "bundleVersion": "codeql-bundle-v2.25.5",
+  "cliVersion": "2.25.5",
+  "priorBundleVersion": "codeql-bundle-v2.25.4",
+  "priorCliVersion": "2.25.4"
 }

src/environment.ts

@@ -1,3 +1,5 @@
+import * as core from "@actions/core";
+
 /**
  * Environment variables used by the CodeQL Action.
  *
@@ -154,3 +156,29 @@ export enum EnvVar {
   /** Used by Code Scanning Risk Assessment to communicate the assessment ID to the CodeQL Action. */
   RISK_ASSESSMENT_ID = "CODEQL_ACTION_RISK_ASSESSMENT_ID",
 }
+
+/**
+ * Returns whether we are in test mode. This is used by CodeQL Action PR checks.
+ *
+ * In test mode, we skip several uploads (SARIF results, status reports, DBs, ...).
+ */
+export function isInTestMode(): boolean {
+  return process.env[EnvVar.TEST_MODE] === "true";
+}
+
+/**
+ * Wrapper around `core.exportVariable` which does not call `core.exportVariable`
+ * when running unit tests. This is important, because otherwise `core.exportVariable`
+ * sets environment variables for other steps in a workflow when we run unit tests in CI.
+ */
+export function exportVariable(name: string, val: any): void {
+  if (process.env["NODE_ENV"] === "test") {
+    // Setting the environment variable for the current process is OK since we reset
+    // those at the end of each test. This allows tests to pass that rely on that
+    // part of the `core.exportVariable` behaviour.
+    process.env[name] = val;
+  } else {
+    // Call `core.exportVariable` whenever we are not in a test environment.
+    core.exportVariable(name, val);
+  }
+}

src/init-action-post.ts

@@ -20,7 +20,7 @@ import {
   DependencyCachingUsageReport,
   getDependencyCacheUsage,
 } from "./dependency-caching";
-import { EnvVar } from "./environment";
+import { EnvVar, exportVariable } from "./environment";
 import { initFeatures } from "./feature-flags";
 import * as gitUtils from "./git-utils";
 import * as initActionPostHelper from "./init-action-post-helper";
@@ -157,7 +157,7 @@ function getFinalJobStatus(config: Config | undefined): JobStatus {
   let jobStatus: JobStatus;
 
   if (process.env[EnvVar.ANALYZE_DID_COMPLETE_SUCCESSFULLY] === "true") {
-    core.exportVariable(EnvVar.JOB_STATUS, JobStatus.SuccessStatus);
+    exportVariable(EnvVar.JOB_STATUS, JobStatus.SuccessStatus);
     jobStatus = JobStatus.SuccessStatus;
   } else if (config !== undefined) {
     // - We have computed a CodeQL config
@@ -182,7 +182,7 @@ function getFinalJobStatus(config: Config | undefined): JobStatus {
 
   // This shouldn't be necessary, but in the odd case that we run more than one
   // `init` post step, ensure the job status is consistent between them.
-  core.exportVariable(EnvVar.JOB_STATUS, jobStatus);
+  exportVariable(EnvVar.JOB_STATUS, jobStatus);
   return jobStatus;
 }
 

src/init-action.ts

@@ -37,7 +37,7 @@ import {
   makeDiagnostic,
   makeTelemetryDiagnostic,
 } from "./diagnostics";
-import { EnvVar } from "./environment";
+import { EnvVar, exportVariable } from "./environment";
 import { Feature, FeatureEnablement, initFeatures } from "./feature-flags";
 import {
   loadPropertiesFromApi,
@@ -255,9 +255,9 @@ async function run(startedAt: Date) {
     // Create a unique identifier for this run.
     const jobRunUuid = uuidV4();
     logger.info(`Job run UUID is ${jobRunUuid}.`);
-    core.exportVariable(EnvVar.JOB_RUN_UUID, jobRunUuid);
+    exportVariable(EnvVar.JOB_RUN_UUID, jobRunUuid);
 
-    core.exportVariable(EnvVar.INIT_ACTION_HAS_RUN, "true");
+    exportVariable(EnvVar.INIT_ACTION_HAS_RUN, "true");
 
     configFile = getOptionalInput("config-file");
 
@@ -343,7 +343,7 @@ async function run(startedAt: Date) {
         );
       }
       if (semver.lt(actualVer, publicPreview)) {
-        core.exportVariable(EnvVar.EXPERIMENTAL_FEATURES, "true");
+        exportVariable(EnvVar.EXPERIMENTAL_FEATURES, "true");
         logger.info("Experimental Rust analysis enabled");
       }
     }
@@ -508,7 +508,7 @@ async function run(startedAt: Date) {
     // Forward Go flags
     const goFlags = process.env["GOFLAGS"];
     if (goFlags) {
-      core.exportVariable("GOFLAGS", goFlags);
+      exportVariable("GOFLAGS", goFlags);
       core.warning(
         "Passing the GOFLAGS env parameter to the init action is deprecated. Please move this to the analyze action.",
       );
@@ -554,7 +554,7 @@ async function run(startedAt: Date) {
 
             // Store the original location of our wrapper script somewhere where we can
             // later retrieve it from and cross-check that it hasn't been changed.
-            core.exportVariable(EnvVar.GO_BINARY_LOCATION, goWrapperPath);
+            exportVariable(EnvVar.GO_BINARY_LOCATION, goWrapperPath);
           } catch (e) {
             logger.warning(
               `Analyzing Go on Linux, but failed to install wrapper script. Tracing custom builds may fail: ${e}`,
@@ -563,7 +563,7 @@ async function run(startedAt: Date) {
         } else {
           // Store the location of the original Go binary, so we can check that no setup tasks were performed after the
           // `init` Action ran.
-          core.exportVariable(EnvVar.GO_BINARY_LOCATION, goBinaryPath);
+          exportVariable(EnvVar.GO_BINARY_LOCATION, goBinaryPath);
         }
       } catch (e) {
         logger.warning(
@@ -598,12 +598,12 @@ async function run(startedAt: Date) {
     // threads it would ask extractors to use. See help text for the "--ram" and "--threads"
     // options at https://codeql.github.com/docs/codeql-cli/manual/database-trace-command/
     // for details.
-    core.exportVariable(
+    exportVariable(
       "CODEQL_RAM",
       process.env["CODEQL_RAM"] ||
         getCodeQLMemoryLimit(getOptionalInput("ram"), logger).toString(),
     );
-    core.exportVariable(
+    exportVariable(
       "CODEQL_THREADS",
       process.env["CODEQL_THREADS"] ||
         getThreadsFlagValue(getOptionalInput("threads"), logger).toString(),
@@ -611,7 +611,7 @@ async function run(startedAt: Date) {
 
     // Disable Kotlin extractor if feature flag set
     if (await features.getValue(Feature.DisableKotlinAnalysisEnabled)) {
-      core.exportVariable("CODEQL_EXTRACTOR_JAVA_AGENT_DISABLE_KOTLIN", "true");
+      exportVariable("CODEQL_EXTRACTOR_JAVA_AGENT_DISABLE_KOTLIN", "true");
     }
 
     const kotlinLimitVar =
@@ -620,7 +620,7 @@ async function run(startedAt: Date) {
       (await codeQlVersionAtLeast(codeql, "2.20.3")) &&
       !(await codeQlVersionAtLeast(codeql, "2.20.4"))
     ) {
-      core.exportVariable(kotlinLimitVar, "2.1.20");
+      exportVariable(kotlinLimitVar, "2.1.20");
     }
 
     // Restore dependency cache(s), if they exist.
@@ -669,10 +669,7 @@ async function run(startedAt: Date) {
       config.buildMode === BuildMode.None &&
       config.languages.includes(BuiltInLanguage.java)
     ) {
-      core.exportVariable(
-        EnvVar.JAVA_EXTRACTOR_MINIMIZE_DEPENDENCY_JARS,
-        "true",
-      );
+      exportVariable(EnvVar.JAVA_EXTRACTOR_MINIMIZE_DEPENDENCY_JARS, "true");
     }
 
     const { registriesAuthTokens, qlconfigFile } =
@@ -729,7 +726,7 @@ async function run(startedAt: Date) {
     const tracerConfig = await getCombinedTracerConfig(codeql, config);
     if (tracerConfig !== undefined) {
       for (const [key, value] of Object.entries(tracerConfig.env)) {
-        core.exportVariable(key, value);
+        exportVariable(key, value);
       }
     }
 
@@ -740,7 +737,7 @@ async function run(startedAt: Date) {
         getOptionalEnvVar(JavaEnvVars.JAVA_TOOL_OPTIONS) || "";
 
       // Add the network debugging options.
-      core.exportVariable(
+      exportVariable(
         JavaEnvVars.JAVA_TOOL_OPTIONS,
         `${existingJavaToolOptions} -Djavax.net.debug=all`,
       );

src/init.test.ts

@@ -1,13 +1,13 @@
 import * as fs from "fs";
 import path from "path";
 
-import * as core from "@actions/core";
 import * as github from "@actions/github";
 import test, { ExecutionContext } from "ava";
 import * as sinon from "sinon";
 
 import * as actionsUtil from "./actions-util";
 import { createStubCodeQL } from "./codeql";
+import * as environment from "./environment";
 import { Feature } from "./feature-flags";
 import {
   checkPacksForOverlayCompatibility,
@@ -545,7 +545,7 @@ test.serial(
 test.serial(
   "file coverage deprecation warning for org-owned repo with default setup recommends repo property",
   (t) => {
-    const exportVariableStub = sinon.stub(core, "exportVariable");
+    const exportVariableStub = sinon.stub(environment, "exportVariable");
     sinon.stub(actionsUtil, "isDefaultSetup").returns(true);
     github.context.payload = {
       repository: {
@@ -572,7 +572,7 @@ test.serial(
 test.serial(
   "file coverage deprecation warning for org-owned repo with advanced setup recommends env var and repo property",
   (t) => {
-    const exportVariableStub = sinon.stub(core, "exportVariable");
+    const exportVariableStub = sinon.stub(environment, "exportVariable");
     sinon.stub(actionsUtil, "isDefaultSetup").returns(false);
     github.context.payload = {
       repository: {
@@ -600,7 +600,7 @@ test.serial(
 test.serial(
   "file coverage deprecation warning for user-owned repo with default setup recommends advanced setup",
   (t) => {
-    const exportVariableStub = sinon.stub(core, "exportVariable");
+    const exportVariableStub = sinon.stub(environment, "exportVariable");
     sinon.stub(actionsUtil, "isDefaultSetup").returns(true);
     github.context.payload = {
       repository: {
@@ -626,7 +626,7 @@ test.serial(
 test.serial(
   "file coverage deprecation warning for user-owned repo with advanced setup recommends env var",
   (t) => {
-    const exportVariableStub = sinon.stub(core, "exportVariable");
+    const exportVariableStub = sinon.stub(environment, "exportVariable");
     sinon.stub(actionsUtil, "isDefaultSetup").returns(false);
     github.context.payload = {
       repository: {
@@ -651,7 +651,7 @@ test.serial(
 test.serial(
   "file coverage deprecation warning for unknown owner type with default setup recommends advanced setup",
   (t) => {
-    const exportVariableStub = sinon.stub(core, "exportVariable");
+    const exportVariableStub = sinon.stub(environment, "exportVariable");
     sinon.stub(actionsUtil, "isDefaultSetup").returns(true);
     github.context.payload = { repository: undefined };
     const messages: LoggedMessage[] = [];
@@ -672,7 +672,7 @@ test.serial(
 test.serial(
   "file coverage deprecation warning for unknown owner type with advanced setup recommends env var",
   (t) => {
-    const exportVariableStub = sinon.stub(core, "exportVariable");
+    const exportVariableStub = sinon.stub(environment, "exportVariable");
     sinon.stub(actionsUtil, "isDefaultSetup").returns(false);
     github.context.payload = { repository: undefined };
     const messages: LoggedMessage[] = [];
@@ -694,7 +694,7 @@ test.serial(
   (t) => {
     process.env["CODEQL_ACTION_DID_LOG_FILE_COVERAGE_ON_PRS_DEPRECATION"] =
       "true";
-    const exportVariableStub = sinon.stub(core, "exportVariable");
+    const exportVariableStub = sinon.stub(environment, "exportVariable");
     const messages: LoggedMessage[] = [];
     logFileCoverageOnPrsDeprecationWarning(getRecordingLogger(messages));
     t.is(messages.length, 0);

src/init.ts

@@ -1,7 +1,6 @@
 import * as fs from "fs";
 import * as path from "path";
 
-import * as core from "@actions/core";
 import * as toolrunner from "@actions/exec/lib/toolrunner";
 import * as github from "@actions/github";
 import * as io from "@actions/io";
@@ -16,7 +15,7 @@ import {
 import { GitHubApiDetails } from "./api-client";
 import { CodeQL, setupCodeQL } from "./codeql";
 import * as configUtils from "./config-utils";
-import { EnvVar } from "./environment";
+import { EnvVar, exportVariable } from "./environment";
 import {
   CodeQLDefaultVersionInfo,
   Feature,
@@ -418,5 +417,5 @@ export function logFileCoverageOnPrsDeprecationWarning(logger: Logger): void {
   }
 
   logger.warning(message);
-  core.exportVariable(EnvVar.DID_LOG_FILE_COVERAGE_ON_PRS_DEPRECATION, "true");
+  exportVariable(EnvVar.DID_LOG_FILE_COVERAGE_ON_PRS_DEPRECATION, "true");
 }

src/overlay/caching.test.ts

@@ -8,6 +8,7 @@ import * as sinon from "sinon";
 import * as actionsUtil from "../actions-util";
 import * as apiClient from "../api-client";
 import type { ResolveDatabaseOutput } from "../codeql";
+import * as environment from "../environment";
 import * as gitUtils from "../git-utils";
 import { BuiltInLanguage } from "../languages";
 import { getRunnerLogger } from "../logging";
@@ -82,7 +83,7 @@ const testDownloadOverlayBaseDatabaseFromCache = makeMacro({
 
       sinon.stub(apiClient, "getAutomationID").resolves("test-automation-id/");
 
-      sinon.stub(utils, "isInTestMode").returns(testCase.isInTestMode);
+      sinon.stub(environment, "isInTestMode").returns(testCase.isInTestMode);
 
       if (testCase.restoreCacheResult instanceof Error) {
         sinon

src/setup-codeql-action.ts

@@ -11,7 +11,7 @@ import { AnalysisKind, getAnalysisKinds } from "./analyses";
 import { getGitHubVersion } from "./api-client";
 import { CodeQL } from "./codeql";
 import { getRawLanguagesNoAutodetect } from "./config-utils";
-import { EnvVar } from "./environment";
+import { EnvVar, exportVariable } from "./environment";
 import { initFeatures } from "./feature-flags";
 import { initCodeQL } from "./init";
 import { getActionsLogger, Logger } from "./logging";
@@ -125,7 +125,7 @@ async function run(startedAt: Date): Promise<void> {
 
     const jobRunUuid = uuidV4();
     logger.info(`Job run UUID is ${jobRunUuid}.`);
-    core.exportVariable(EnvVar.JOB_RUN_UUID, jobRunUuid);
+    exportVariable(EnvVar.JOB_RUN_UUID, jobRunUuid);
 
     const statusReportBase = await createStatusReportBase(
       ActionName.SetupCodeQL,
@@ -165,7 +165,7 @@ async function run(startedAt: Date): Promise<void> {
     core.setOutput("codeql-path", codeql.getPath());
     core.setOutput("codeql-version", (await codeql.getVersion()).version);
 
-    core.exportVariable(EnvVar.SETUP_CODEQL_ACTION_HAS_RUN, "true");
+    exportVariable(EnvVar.SETUP_CODEQL_ACTION_HAS_RUN, "true");
   } catch (unwrappedError) {
     const error = wrapError(unwrappedError);
     core.setFailed(error.message);

src/status-report.ts

@@ -15,7 +15,7 @@ import { getAnalysisKey, getApiClient } from "./api-client";
 import { parseRegistriesWithoutCredentials, type Config } from "./config-utils";
 import { DependencyCacheRestoreStatusReport } from "./dependency-caching";
 import { DocUrl } from "./doc-url";
-import { EnvVar } from "./environment";
+import { EnvVar, exportVariable } from "./environment";
 import { getRef } from "./git-utils";
 import { Logger } from "./logging";
 import { OverlayBaseDatabaseDownloadStats } from "./overlay/caching";
@@ -216,12 +216,12 @@ export function getJobStatusDisplayName(status: JobStatus): string {
  */
 function setJobStatusIfUnsuccessful(actionStatus: ActionStatus) {
   if (actionStatus === "user-error") {
-    core.exportVariable(
+    exportVariable(
       EnvVar.JOB_STATUS,
       process.env[EnvVar.JOB_STATUS] ?? JobStatus.ConfigErrorStatus,
     );
   } else if (actionStatus === "failure" || actionStatus === "aborted") {
-    core.exportVariable(
+    exportVariable(
       EnvVar.JOB_STATUS,
       process.env[EnvVar.JOB_STATUS] ?? JobStatus.FailureStatus,
     );
@@ -280,7 +280,7 @@ export async function createStatusReportBase(
     let workflowStartedAt = process.env[EnvVar.WORKFLOW_STARTED_AT];
     if (workflowStartedAt === undefined) {
       workflowStartedAt = actionStartedAt.toISOString();
-      core.exportVariable(EnvVar.WORKFLOW_STARTED_AT, workflowStartedAt);
+      exportVariable(EnvVar.WORKFLOW_STARTED_AT, workflowStartedAt);
     }
     const runnerOs = getRequiredEnvParam("RUNNER_OS");
     const codeQlCliVersion = getCachedCodeQlVersion();
@@ -289,7 +289,7 @@ export async function createStatusReportBase(
     // re-export the testing environment variable so that it is available to subsequent steps,
     // even if it was only set for this step
     if (testingEnvironment) {
-      core.exportVariable(EnvVar.TESTING_ENVIRONMENT, testingEnvironment);
+      exportVariable(EnvVar.TESTING_ENVIRONMENT, testingEnvironment);
     }
     const isSteadyStateDefaultSetupRun =
       process.env["CODE_SCANNING_IS_STEADY_STATE_DEFAULT_SETUP"] === "true";

src/upload-lib.ts

@@ -14,7 +14,7 @@ import { getGitHubVersion, wrapApiConfigurationError } from "./api-client";
 import { CodeQL, getCodeQL } from "./codeql";
 import { getConfig } from "./config-utils";
 import { readDiffRangesJsonFile } from "./diff-informed-analysis-utils";
-import { EnvVar } from "./environment";
+import { EnvVar, exportVariable } from "./environment";
 import { FeatureEnablement } from "./feature-flags";
 import * as fingerprints from "./fingerprints";
 import * as gitUtils from "./git-utils";
@@ -126,7 +126,7 @@ async function combineSarifFilesUsingCLI(
       logger.warning(
         `Uploading multiple SARIF runs with the same category is deprecated ${deprecationWarningMessage}. Please update your workflow to upload a single run per category. ${deprecationMoreInformationMessage}`,
       );
-      core.exportVariable("CODEQL_MERGE_SARIF_DEPRECATION_WARNING", "true");
+      exportVariable("CODEQL_MERGE_SARIF_DEPRECATION_WARNING", "true");
     }
 
     // If not, use the naive method of combining the files.
@@ -1023,7 +1023,7 @@ export function validateUniqueCategory(
           `Category: (${id ? id : "none"}) Tool: (${tool ? tool : "none"})`,
       );
     }
-    core.exportVariable(sentinelEnvVar, sentinelEnvVar);
+    exportVariable(sentinelEnvVar, sentinelEnvVar);
   }
 }
 

src/util.ts

@@ -13,11 +13,13 @@ import * as apiCompatibility from "./api-compatibility.json";
 import type { CodeQL, VersionInfo } from "./codeql";
 import type { Pack } from "./config/db-config";
 import type { Config } from "./config-utils";
-import { EnvVar } from "./environment";
+import { EnvVar, exportVariable, isInTestMode } from "./environment";
 import * as json from "./json";
 import { Language } from "./languages";
 import { Logger } from "./logging";
 
+export { isInTestMode } from "./environment";
+
 /**
  * The name of the file containing the base database OIDs, as stored in the
  * root of the database location.
@@ -515,7 +517,7 @@ export function checkGitHubVersionInRange(
     );
   }
   hasBeenWarnedAboutVersion = true;
-  core.exportVariable(CODEQL_ACTION_WARNED_ABOUT_VERSION_ENV_VAR, true);
+  exportVariable(CODEQL_ACTION_WARNED_ABOUT_VERSION_ENV_VAR, true);
 }
 
 export enum DisallowedAPIVersionReason {
@@ -559,11 +561,11 @@ export function assertNever(value: never): never {
  * knowing what version of CodeQL we're running.
  */
 export function initializeEnvironment(version: string) {
-  core.exportVariable(EnvVar.FEATURE_MULTI_LANGUAGE, "false");
-  core.exportVariable(EnvVar.FEATURE_SANDWICH, "false");
-  core.exportVariable(EnvVar.FEATURE_SARIF_COMBINE, "true");
-  core.exportVariable(EnvVar.FEATURE_WILL_UPLOAD, "true");
-  core.exportVariable(EnvVar.VERSION, version);
+  exportVariable(EnvVar.FEATURE_MULTI_LANGUAGE, "false");
+  exportVariable(EnvVar.FEATURE_SANDWICH, "false");
+  exportVariable(EnvVar.FEATURE_SARIF_COMBINE, "true");
+  exportVariable(EnvVar.FEATURE_WILL_UPLOAD, "true");
+  exportVariable(EnvVar.VERSION, version);
 }
 
 /**
@@ -708,15 +710,6 @@ export function isGoodVersion(versionSpec: string) {
   return !BROKEN_VERSIONS.includes(versionSpec);
 }
 
-/**
- * Returns whether we are in test mode. This is used by CodeQL Action PR checks.
- *
- * In test mode, we skip several uploads (SARIF results, status reports, DBs, ...).
- */
-export function isInTestMode(): boolean {
-  return process.env[EnvVar.TEST_MODE] === "true";
-}
-
 /**
  * Returns whether we specifically want to skip uploading SARIF files.
  */
@@ -935,7 +928,7 @@ export async function checkDiskUsage(
       } else {
         logger.debug(message);
       }
-      core.exportVariable(EnvVar.HAS_WARNED_ABOUT_DISK_SPACE, "true");
+      exportVariable(EnvVar.HAS_WARNED_ABOUT_DISK_SPACE, "true");
     }
     return {
       numAvailableBytes: diskUsage.bavail * blockSizeInBytes,
@@ -984,7 +977,7 @@ export function checkActionVersion(
           "https://github.blog/changelog/2025-10-28-upcoming-deprecation-of-codeql-action-v3/",
       );
       // set LOG_VERSION_DEPRECATION env var to prevent the warning from being logged multiple times
-      core.exportVariable(EnvVar.LOG_VERSION_DEPRECATION, "true");
+      exportVariable(EnvVar.LOG_VERSION_DEPRECATION, "true");
     }
   }
 }