Add and configure ESLint and update configuration for Prettier (#341)

* Turn on ESLint and update Prettier

* Update eslint config

* Update eslint config

* Update dependencies

* Update ESLint and Prettier configurations

* update package.json

* Update prettier command

* Update prettier config file

* Change CRLF to LF

* Update docs

* Update docs

src/cache-restore.ts

@@ -48,7 +48,7 @@ export const restoreCache = async (
 };
 
 const findDependencyFile = (packageManager: PackageManagerInfo) => {
-  let dependencyFile = packageManager.dependencyFilePattern;
+  const dependencyFile = packageManager.dependencyFilePattern;
   const workspace = process.env.GITHUB_WORKSPACE!;
   const rootContent = fs.readdirSync(workspace);
 

src/cache-utils.ts

@@ -35,7 +35,7 @@ export const getCacheDirectoryPath = async (
   packageManagerInfo: PackageManagerInfo
 ) => {
   const pathList = await Promise.all(
-    packageManagerInfo.cacheFolderCommandList.map(command =>
+    packageManagerInfo.cacheFolderCommandList.map(async command =>
       getCommandOutput(command)
     )
   );

src/installer.ts

@@ -37,7 +37,7 @@ export async function getGo(
   arch = os.arch()
 ) {
   let manifest: tc.IToolRelease[] | undefined;
-  let osPlat: string = os.platform();
+  const osPlat: string = os.platform();
 
   if (
     versionSpec === StableReleaseAlias.Stable ||
@@ -83,8 +83,7 @@ export async function getGo(
   }
 
   // check cache
-  let toolPath: string;
-  toolPath = tc.find('go', versionSpec, arch);
+  const toolPath = tc.find('go', versionSpec, arch);
   // If not found in cache, download
   if (toolPath) {
     core.info(`Found in cache @ ${toolPath}`);
@@ -246,13 +245,12 @@ async function getInfoFromDist(
   versionSpec: string,
   arch: string
 ): Promise<IGoVersionInfo | null> {
-  let version: IGoVersion | undefined;
-  version = await findMatch(versionSpec, arch);
+  const version: IGoVersion | undefined = await findMatch(versionSpec, arch);
   if (!version) {
     return null;
   }
 
-  let downloadUrl: string = `https://storage.googleapis.com/golang/${version.files[0].filename}`;
+  const downloadUrl = `https://storage.googleapis.com/golang/${version.files[0].filename}`;
 
   return <IGoVersionInfo>{
     type: 'dist',
@@ -282,8 +280,8 @@ export async function findMatch(
 
   let goFile: IGoVersionFile | undefined;
   for (let i = 0; i < candidates.length; i++) {
-    let candidate: IGoVersion = candidates[i];
-    let version = makeSemver(candidate.version);
+    const candidate: IGoVersion = candidates[i];
+    const version = makeSemver(candidate.version);
 
     core.debug(`check ${version} satisfies ${versionSpec}`);
     if (semver.satisfies(version, versionSpec)) {
@@ -331,9 +329,9 @@ export async function getVersionsDist(
 export function makeSemver(version: string): string {
   version = version.replace('go', '');
   version = version.replace('beta', '-beta.').replace('rc', '-rc.');
-  let parts = version.split('-');
+  const parts = version.split('-');
 
-  let semVersion = semver.coerce(parts[0])?.version;
+  const semVersion = semver.coerce(parts[0])?.version;
   if (!semVersion) {
     throw new Error(
       `The version: ${version} can't be changed to SemVer notation`
@@ -369,9 +367,9 @@ export function parseGoVersionFile(versionFilePath: string): string {
 }
 
 async function resolveStableVersionDist(versionSpec: string, arch: string) {
-  let archFilter = sys.getArch(arch);
-  let platFilter = sys.getPlatform();
-  const dlUrl: string = 'https://golang.org/dl/?mode=json&include=all';
+  const archFilter = sys.getArch(arch);
+  const platFilter = sys.getPlatform();
+  const dlUrl = 'https://golang.org/dl/?mode=json&include=all';
   const candidates: IGoVersion[] | null = await module.exports.getVersionsDist(
     dlUrl
   );

src/main.ts

@@ -27,8 +27,8 @@ export async function run() {
     }
 
     if (versionSpec) {
-      let token = core.getInput('token');
-      let auth = !token ? undefined : `token ${token}`;
+      const token = core.getInput('token');
+      const auth = !token ? undefined : `token ${token}`;
 
       const checkLatest = core.getBooleanInput('check-latest');
 
@@ -51,13 +51,13 @@ export async function run() {
         core.exportVariable('GOROOT', installDir);
       }
 
-      let added = await addBinToPath();
+      const added = await addBinToPath();
       core.debug(`add bin ${added}`);
       core.info(`Successfully set up Go version ${versionSpec}`);
     }
 
-    let goPath = await io.which('go');
-    let goVersion = (cp.execSync(`${goPath} version`) || '').toString();
+    const goPath = await io.which('go');
+    const goVersion = (cp.execSync(`${goPath} version`) || '').toString();
 
     if (cache && isCacheFeatureAvailable()) {
       const packageManager = 'default';
@@ -79,7 +79,7 @@ export async function run() {
     core.setOutput('go-version', parseGoVersion(goVersion));
 
     core.startGroup('go env');
-    let goEnv = (cp.execSync(`${goPath} env`) || '').toString();
+    const goEnv = (cp.execSync(`${goPath} env`) || '').toString();
     core.info(goEnv);
     core.endGroup();
   } catch (error) {
@@ -89,16 +89,16 @@ export async function run() {
 
 export async function addBinToPath(): Promise<boolean> {
   let added = false;
-  let g = await io.which('go');
+  const g = await io.which('go');
   core.debug(`which go :${g}:`);
   if (!g) {
     core.debug('go not in the path');
     return added;
   }
 
-  let buf = cp.execSync('go env GOPATH');
+  const buf = cp.execSync('go env GOPATH');
   if (buf.length > 1) {
-    let gp = buf.toString().trim();
+    const gp = buf.toString().trim();
     core.debug(`go env GOPATH :${gp}:`);
     if (!fs.existsSync(gp)) {
       // some of the hosted images have go install but not profile dir
@@ -106,7 +106,7 @@ export async function addBinToPath(): Promise<boolean> {
       await io.mkdirP(gp);
     }
 
-    let bp = path.join(gp, 'bin');
+    const bp = path.join(gp, 'bin');
     if (!fs.existsSync(bp)) {
       core.debug(`creating ${bp}`);
       await io.mkdirP(bp);

src/system.ts

@@ -1,4 +1,4 @@
-const os = require('os');
+import os from 'os';
 
 export function getPlatform(): string {
   // darwin and linux match already