Turn on ESLint and update Prettier

.eslintignore

@@ -0,0 +1,6 @@
+# Ignore list
+/*
+
+# Do not ignore these folders:
+!__tests__/
+!src/

.eslintrc.js

@@ -0,0 +1,50 @@
+// This is a reusable configuration file copied from https://github.com/actions/reusable-workflows/tree/main/reusable-configurations. Please don't make changes to this file as it's the subject of an automatic update.
+module.exports = {
+  extends: [
+    'eslint:recommended',
+    'plugin:@typescript-eslint/recommended',
+    'plugin:eslint-plugin-jest/recommended',
+    'eslint-config-prettier'
+  ],
+  parser: '@typescript-eslint/parser',
+  plugins: ['@typescript-eslint', 'eslint-plugin-jest'],
+  rules: {
+    '@typescript-eslint/no-require-imports': 'error',
+    '@typescript-eslint/no-useless-constructor': 'error',
+    '@typescript-eslint/no-non-null-assertion': 'off',
+    '@typescript-eslint/no-explicit-any': 'off',
+    '@typescript-eslint/ban-ts-comment': [
+      'error',
+      {
+        'ts-ignore': 'allow-with-description'
+      }
+    ],
+    'no-console': 'error',
+    'yoda': 'error',
+    'prefer-const': [
+      'error',
+      {
+        destructuring: 'all'
+      }
+    ],
+    'no-control-regex': 'off',
+    'no-constant-condition': ['error', {checkLoops: false}]
+  },
+  overrides: [
+    {
+      files: ['**/*{test,spec}.ts'],
+      rules: {
+        '@typescript-eslint/no-unused-vars': 'off',
+        '@typescript-eslint/no-empty-function': 'off',
+        'jest/no-standalone-expect': 'off',
+        'jest/no-conditional-expect': 'off',
+        '@typescript-eslint/prefer-readonly': 'off'
+      }
+    }
+  ],
+  env: {
+    node: true,
+    es6: true,
+    'jest/globals': true
+  }
+};

.github/ISSUE_TEMPLATE/config.yml

@@ -1 +1 @@
-blank_issues_enabled: false
+blank_issues_enabled: false

.github/workflows/basic-validation.yml

@@ -13,4 +13,4 @@ on:
 jobs:
   call-basic-validation:
     name: Basic validation
-    uses: actions/reusable-workflows/.github/workflows/basic-validation.yml@main
+    uses: actions/reusable-workflows/.github/workflows/basic-validation.yml@main

.github/workflows/check-dist.yml

@@ -14,4 +14,4 @@ on:
 jobs:
   call-check-dist:
     name: Check dist/
-    uses: actions/reusable-workflows/.github/workflows/check-dist.yml@main
+    uses: actions/reusable-workflows/.github/workflows/check-dist.yml@main

.github/workflows/codeql-analysis.yml

@@ -2,13 +2,13 @@ name: CodeQL analysis
 
 on:
   push:
-    branches: [ main ]
+    branches: [main]
   pull_request:
-    branches: [ main ]
+    branches: [main]
   schedule:
     - cron: '0 3 * * 0'
 
 jobs:
   call-codeQL-analysis:
-    name: CodeQL analysis 
+    name: CodeQL analysis
-    uses: actions/reusable-workflows/.github/workflows/codeql-analysis.yml@main
+    uses: actions/reusable-workflows/.github/workflows/codeql-analysis.yml@main

.github/workflows/licensed.yml

@@ -11,4 +11,4 @@ on:
 jobs:
   call-licensed:
     name: Licensed
-    uses: actions/reusable-workflows/.github/workflows/licensed.yml@main
+    uses: actions/reusable-workflows/.github/workflows/licensed.yml@main

.github/workflows/versions.yml

@@ -42,7 +42,7 @@ jobs:
           go-version: oldstable
       - name: Verify Go
         run: go version
-  
+
   aliases-arch:
     runs-on: ${{ matrix.os }}
     strategy:
@@ -52,8 +52,8 @@ jobs:
         version: [stable, oldstable]
         architecture: [x64, x32]
         exclude:
-        - os: macos-latest
+          - os: macos-latest
-          architecture: x32
+            architecture: x32
     steps:
       - uses: actions/checkout@v3
       - name: Setup Go ${{ matrix.version }} ${{ matrix.architecture }}

.prettierignore

@@ -0,0 +1,7 @@
+# Ignore list
+/*
+
+# Do not ignore these folders:
+!__tests__/
+!.github/
+!src/

.prettierrc.js

@@ -0,0 +1,11 @@
+// This is a reusable configuration file copied from https://github.com/actions/reusable-workflows/tree/main/reusable-configurations. Please don't make changes to this file as it's the subject of an automatic update.
+module.exports = {
+  printWidth: 80,
+  tabWidth: 2,
+  useTabs: false,
+  semi: true,
+  singleQuote: true,
+  trailingComma: 'none',
+  bracketSpacing: false,
+  arrowParens: 'avoid'
+};

.prettierrc.json

@@ -1,11 +0,0 @@
-{
-    "printWidth": 80,
-    "tabWidth": 2,
-    "useTabs": false,
-    "semi": true,
-    "singleQuote": true,
-    "trailingComma": "none",
-    "bracketSpacing": false,
-    "arrowParens": "avoid",
-    "parser": "typescript"
-  }

__tests__/cache-restore.test.ts

@@ -8,14 +8,14 @@ import {PackageManagerInfo} from '../src/package-managers';
 
 describe('restoreCache', () => {
   //Arrange
-  let hashFilesSpy = jest.spyOn(glob, 'hashFiles');
+  const hashFilesSpy = jest.spyOn(glob, 'hashFiles');
-  let getCacheDirectoryPathSpy = jest.spyOn(
+  const getCacheDirectoryPathSpy = jest.spyOn(
     cacheUtils,
     'getCacheDirectoryPath'
   );
-  let restoreCacheSpy = jest.spyOn(cache, 'restoreCache');
+  const restoreCacheSpy = jest.spyOn(cache, 'restoreCache');
-  let infoSpy = jest.spyOn(core, 'info');
+  const infoSpy = jest.spyOn(core, 'info');
-  let setOutputSpy = jest.spyOn(core, 'setOutput');
+  const setOutputSpy = jest.spyOn(core, 'setOutput');
 
   const versionSpec = '1.13.1';
   const packageManager = 'default';
@@ -40,13 +40,13 @@ describe('restoreCache', () => {
     });
 
     //Act + Assert
-    expect(async () => {
+    await expect(async () => {
       await cacheRestore.restoreCache(
         versionSpec,
         packageManager,
         cacheDependencyPath
       );
-    }).rejects.toThrowError(
+    }).rejects.toThrow(
       'Some specified paths were not resolved, unable to cache dependencies.'
     );
   });
@@ -71,7 +71,7 @@ describe('restoreCache', () => {
       packageManager,
       cacheDependencyPath
     );
-    expect(infoSpy).toBeCalledWith(`Cache is not found`);
+    expect(infoSpy).toHaveBeenCalledWith(`Cache is not found`);
   });
 
   it('should set output if cache hit is occured', async () => {
@@ -94,6 +94,6 @@ describe('restoreCache', () => {
       packageManager,
       cacheDependencyPath
     );
-    expect(setOutputSpy).toBeCalledWith('cache-hit', true);
+    expect(setOutputSpy).toHaveBeenCalledWith('cache-hit', true);
   });
 });

__tests__/cache-utils.test.ts

@@ -6,7 +6,7 @@ import {PackageManagerInfo} from '../src/package-managers';
 
 describe('getCommandOutput', () => {
   //Arrange
-  let getExecOutputSpy = jest.spyOn(exec, 'getExecOutput');
+  const getExecOutputSpy = jest.spyOn(exec, 'getExecOutput');
 
   it('should return trimmed stdout in case of successful exit code', async () => {
     //Arrange
@@ -36,7 +36,7 @@ describe('getCommandOutput', () => {
     });
 
     //Act + Assert
-    expect(async () => {
+    await expect(async () => {
       await cacheUtils.getCommandOutput('command');
     }).rejects.toThrow();
   });
@@ -62,7 +62,7 @@ describe('getPackageManagerInfo', () => {
     const packageManagerName = 'invalidName';
 
     //Act + Assert
-    expect(async () => {
+    await expect(async () => {
       await cacheUtils.getPackageManagerInfo(packageManagerName);
     }).rejects.toThrow();
   });
@@ -70,7 +70,7 @@ describe('getPackageManagerInfo', () => {
 
 describe('getCacheDirectoryPath', () => {
   //Arrange
-  let getExecOutputSpy = jest.spyOn(exec, 'getExecOutput');
+  const getExecOutputSpy = jest.spyOn(exec, 'getExecOutput');
 
   const validPackageManager: PackageManagerInfo = {
     dependencyFilePattern: 'go.sum',
@@ -123,7 +123,7 @@ describe('getCacheDirectoryPath', () => {
     });
 
     //Act + Assert
-    expect(async () => {
+    await expect(async () => {
       await cacheUtils.getCacheDirectoryPath(validPackageManager);
     }).rejects.toThrow();
   });
@@ -136,7 +136,7 @@ describe('getCacheDirectoryPath', () => {
     });
 
     //Act + Assert
-    expect(async () => {
+    await expect(async () => {
       await cacheUtils.getCacheDirectoryPath(validPackageManager);
     }).rejects.toThrow();
   });
@@ -144,8 +144,8 @@ describe('getCacheDirectoryPath', () => {
 
 describe('isCacheFeatureAvailable', () => {
   //Arrange
-  let isFeatureAvailableSpy = jest.spyOn(cache, 'isFeatureAvailable');
+  const isFeatureAvailableSpy = jest.spyOn(cache, 'isFeatureAvailable');
-  let warningSpy = jest.spyOn(core, 'warning');
+  const warningSpy = jest.spyOn(core, 'warning');
 
   it('should return true when cache feature is available', () => {
     //Arrange
@@ -153,16 +153,14 @@ describe('isCacheFeatureAvailable', () => {
       return true;
     });
 
-    let functionResult;
-
     //Act
-    functionResult = cacheUtils.isCacheFeatureAvailable();
+    const functionResult = cacheUtils.isCacheFeatureAvailable();
 
     //Assert
     expect(functionResult).toBeTruthy();
   });
 
-  it('should warn when cache feature is unavailable and GHES is not used ', () => {
+  it('should warn when cache feature is unavailable and GHES is not used', () => {
     //Arrange
     isFeatureAvailableSpy.mockImplementation(() => {
       return false;
@@ -170,7 +168,7 @@ describe('isCacheFeatureAvailable', () => {
 
     process.env['GITHUB_SERVER_URL'] = 'https://github.com';
 
-    let warningMessage =
+    const warningMessage =
       'The runner was not able to contact the cache service. Caching will be skipped';
 
     //Act
@@ -188,10 +186,8 @@ describe('isCacheFeatureAvailable', () => {
 
     process.env['GITHUB_SERVER_URL'] = 'https://github.com';
 
-    let functionResult;
-
     //Act
-    functionResult = cacheUtils.isCacheFeatureAvailable();
+    const functionResult = cacheUtils.isCacheFeatureAvailable();
 
     //Assert
     expect(functionResult).toBeFalsy();
@@ -205,7 +201,7 @@ describe('isCacheFeatureAvailable', () => {
 
     process.env['GITHUB_SERVER_URL'] = 'https://nongithub.com';
 
-    let warningMessage =
+    const warningMessage =
       'Cache action is only supported on GHES version >= 3.5. If you are on version >=3.5 Please check with GHES admin if Actions cache service is enabled or not.';
 
     //Act + Assert

__tests__/setup-go.test.ts

@@ -8,13 +8,13 @@ import path from 'path';
 import * as main from '../src/main';
 import * as im from '../src/installer';
 
-let goJsonData = require('./data/golang-dl.json');
+import goJsonData from './data/golang-dl.json';
-let matchers = require('../matchers.json');
+import matchers from '../matchers.json';
-let goTestManifest = require('./data/versions-manifest.json');
+import goTestManifest from './data/versions-manifest.json';
-let matcherPattern = matchers.problemMatcher[0].pattern[0];
+const matcherPattern = matchers.problemMatcher[0].pattern[0];
-let matcherRegExp = new RegExp(matcherPattern.regexp);
+const matcherRegExp = new RegExp(matcherPattern.regexp);
-let win32Join = path.win32.join;
+const win32Join = path.win32.join;
-let posixJoin = path.posix.join;
+const posixJoin = path.posix.join;
 
 describe('setup-go', () => {
   let inputs = {} as any;
@@ -133,7 +133,7 @@ describe('setup-go', () => {
     os.platform = 'darwin';
     os.arch = 'x64';
 
-    let match = await im.getInfoFromManifest('1.9.7', true, 'mocktoken');
+    const match = await im.getInfoFromManifest('1.9.7', true, 'mocktoken');
     expect(match).toBeDefined();
     expect(match!.resolvedVersion).toBe('1.9.7');
     expect(match!.type).toBe('manifest');
@@ -146,7 +146,7 @@ describe('setup-go', () => {
     os.platform = 'linux';
     os.arch = 'x64';
 
-    let match = await im.getInfoFromManifest('1.9.7', true, 'mocktoken');
+    const match = await im.getInfoFromManifest('1.9.7', true, 'mocktoken');
     expect(match).toBeDefined();
     expect(match!.resolvedVersion).toBe('1.9.7');
     expect(match!.type).toBe('manifest');
@@ -159,7 +159,7 @@ describe('setup-go', () => {
     os.platform = 'win32';
     os.arch = 'x64';
 
-    let match = await im.getInfoFromManifest('1.9.7', true, 'mocktoken');
+    const match = await im.getInfoFromManifest('1.9.7', true, 'mocktoken');
     expect(match).toBeDefined();
     expect(match!.resolvedVersion).toBe('1.9.7');
     expect(match!.type).toBe('manifest');
@@ -173,11 +173,11 @@ describe('setup-go', () => {
     os.arch = 'x64';
 
     // spec: 1.13.0 => 1.13
-    let match: im.IGoVersion | undefined = await im.findMatch('1.13.0');
+    const match: im.IGoVersion | undefined = await im.findMatch('1.13.0');
     expect(match).toBeDefined();
-    let version: string = match ? match.version : '';
+    const version: string = match ? match.version : '';
     expect(version).toBe('go1.13');
-    let fileName = match ? match.files[0].filename : '';
+    const fileName = match ? match.files[0].filename : '';
     expect(fileName).toBe('go1.13.darwin-amd64.tar.gz');
   });
 
@@ -186,11 +186,11 @@ describe('setup-go', () => {
     os.arch = 'x64';
 
     // spec: 1.13 => 1.13.7 (latest)
-    let match: im.IGoVersion | undefined = await im.findMatch('1.13');
+    const match: im.IGoVersion | undefined = await im.findMatch('1.13');
     expect(match).toBeDefined();
-    let version: string = match ? match.version : '';
+    const version: string = match ? match.version : '';
     expect(version).toBe('go1.13.7');
-    let fileName = match ? match.files[0].filename : '';
+    const fileName = match ? match.files[0].filename : '';
     expect(fileName).toBe('go1.13.7.linux-amd64.tar.gz');
   });
 
@@ -199,11 +199,11 @@ describe('setup-go', () => {
     os.arch = 'x64';
 
     // spec: ^1.13.6 => 1.13.7
-    let match: im.IGoVersion | undefined = await im.findMatch('^1.13.6');
+    const match: im.IGoVersion | undefined = await im.findMatch('^1.13.6');
     expect(match).toBeDefined();
-    let version: string = match ? match.version : '';
+    const version: string = match ? match.version : '';
     expect(version).toBe('go1.13.7');
-    let fileName = match ? match.files[0].filename : '';
+    const fileName = match ? match.files[0].filename : '';
     expect(fileName).toBe('go1.13.7.linux-amd64.tar.gz');
   });
 
@@ -212,11 +212,11 @@ describe('setup-go', () => {
     os.arch = 'x32';
 
     // spec: 1 => 1.13.7 (latest)
-    let match: im.IGoVersion | undefined = await im.findMatch('1');
+    const match: im.IGoVersion | undefined = await im.findMatch('1');
     expect(match).toBeDefined();
-    let version: string = match ? match.version : '';
+    const version: string = match ? match.version : '';
     expect(version).toBe('go1.13.7');
-    let fileName = match ? match.files[0].filename : '';
+    const fileName = match ? match.files[0].filename : '';
     expect(fileName).toBe('go1.13.7.windows-386.zip');
   });
 
@@ -225,11 +225,11 @@ describe('setup-go', () => {
     os.arch = 'x64';
 
     // spec: 1.14, stable=false => go1.14rc1
-    let match: im.IGoVersion | undefined = await im.findMatch('1.14.0-rc.1');
+    const match: im.IGoVersion | undefined = await im.findMatch('1.14.0-rc.1');
     expect(match).toBeDefined();
-    let version: string = match ? match.version : '';
+    const version: string = match ? match.version : '';
     expect(version).toBe('go1.14rc1');
-    let fileName = match ? match.files[0].filename : '';
+    const fileName = match ? match.files[0].filename : '';
     expect(fileName).toBe('go1.14rc1.linux-amd64.tar.gz');
   });
 
@@ -237,7 +237,7 @@ describe('setup-go', () => {
     inputs['go-version'] = '1.13.0';
     inputs.stable = 'true';
 
-    let toolPath = path.normalize('/cache/go/1.13.0/x64');
+    const toolPath = path.normalize('/cache/go/1.13.0/x64');
     findSpy.mockImplementation(() => toolPath);
     await main.run();
 
@@ -249,7 +249,7 @@ describe('setup-go', () => {
 
     inSpy.mockImplementation(name => inputs[name]);
 
-    let toolPath = path.normalize('/cache/go/1.13.0/x64');
+    const toolPath = path.normalize('/cache/go/1.13.0/x64');
     findSpy.mockImplementation(() => toolPath);
     await main.run();
 
@@ -260,10 +260,10 @@ describe('setup-go', () => {
     inputs['go-version'] = '1.13.0';
     inSpy.mockImplementation(name => inputs[name]);
 
-    let toolPath = path.normalize('/cache/go/1.13.0/x64');
+    const toolPath = path.normalize('/cache/go/1.13.0/x64');
     findSpy.mockImplementation(() => toolPath);
 
-    let vars: {[key: string]: string} = {};
+    const vars: {[key: string]: string} = {};
     exportVarSpy.mockImplementation((name: string, val: string) => {
       vars[name] = val;
     });
@@ -276,10 +276,10 @@ describe('setup-go', () => {
     inputs['go-version'] = '1.8';
     inSpy.mockImplementation(name => inputs[name]);
 
-    let toolPath = path.normalize('/cache/go/1.8.0/x64');
+    const toolPath = path.normalize('/cache/go/1.8.0/x64');
     findSpy.mockImplementation(() => toolPath);
 
-    let vars: {[key: string]: string} = {};
+    const vars: {[key: string]: string} = {};
     exportVarSpy.mockImplementation((name: string, val: string) => {
       vars[name] = val;
     });
@@ -293,7 +293,7 @@ describe('setup-go', () => {
   it('finds a version of go already in the cache', async () => {
     inputs['go-version'] = '1.13.0';
 
-    let toolPath = path.normalize('/cache/go/1.13.0/x64');
+    const toolPath = path.normalize('/cache/go/1.13.0/x64');
     findSpy.mockImplementation(() => toolPath);
     await main.run();
 
@@ -302,16 +302,16 @@ describe('setup-go', () => {
 
   it('finds a version in the cache and adds it to the path', async () => {
     inputs['go-version'] = '1.13.0';
-    let toolPath = path.normalize('/cache/go/1.13.0/x64');
+    const toolPath = path.normalize('/cache/go/1.13.0/x64');
     findSpy.mockImplementation(() => toolPath);
     await main.run();
 
-    let expPath = path.join(toolPath, 'bin');
+    const expPath = path.join(toolPath, 'bin');
     expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
   });
 
   it('handles unhandled error and reports error', async () => {
-    let errMsg = 'unhandled error message';
+    const errMsg = 'unhandled error message';
     inputs['go-version'] = '1.13.0';
 
     findSpy.mockImplementation(() => {
@@ -329,12 +329,12 @@ describe('setup-go', () => {
 
     findSpy.mockImplementation(() => '');
     dlSpy.mockImplementation(() => '/some/temp/path');
-    let toolPath = path.normalize('/cache/go/1.13.0/x64');
+    const toolPath = path.normalize('/cache/go/1.13.0/x64');
     extractTarSpy.mockImplementation(() => '/some/other/temp/path');
     cacheSpy.mockImplementation(() => toolPath);
     await main.run();
 
-    let expPath = path.join(toolPath, 'bin');
+    const expPath = path.join(toolPath, 'bin');
 
     expect(dlSpy).toHaveBeenCalled();
     expect(extractTarSpy).toHaveBeenCalled();
@@ -352,12 +352,12 @@ describe('setup-go', () => {
     dlSpy.mockImplementation(() => 'C:\\temp\\some\\path');
     extractZipSpy.mockImplementation(() => 'C:\\temp\\some\\other\\path');
 
-    let toolPath = path.normalize('C:\\cache\\go\\1.13.0\\x64');
+    const toolPath = path.normalize('C:\\cache\\go\\1.13.0\\x64');
     cacheSpy.mockImplementation(() => toolPath);
 
     await main.run();
 
-    let expPath = path.win32.join(toolPath, 'bin');
+    const expPath = path.win32.join(toolPath, 'bin');
     expect(dlSpy).toHaveBeenCalledWith(
       'https://storage.googleapis.com/golang/go1.13.1.windows-amd64.zip',
       'C:\\temp\\go1.13.1.windows-amd64.zip',
@@ -384,25 +384,25 @@ describe('setup-go', () => {
     os.platform = 'linux';
     os.arch = 'x64';
 
-    let versionSpec = '1.12.16';
+    const versionSpec = '1.12.16';
 
     inputs['go-version'] = versionSpec;
     inputs['token'] = 'faketoken';
 
-    let expectedUrl =
+    const expectedUrl =
       'https://github.com/actions/go-versions/releases/download/1.12.16-20200616.20/go-1.12.16-linux-x64.tar.gz';
 
     // ... but not in the local cache
     findSpy.mockImplementation(() => '');
 
     dlSpy.mockImplementation(async () => '/some/temp/path');
-    let toolPath = path.normalize('/cache/go/1.12.16/x64');
+    const toolPath = path.normalize('/cache/go/1.12.16/x64');
     extractTarSpy.mockImplementation(async () => '/some/other/temp/path');
     cacheSpy.mockImplementation(async () => toolPath);
 
     await main.run();
 
-    let expPath = path.join(toolPath, 'bin');
+    const expPath = path.join(toolPath, 'bin');
 
     expect(dlSpy).toHaveBeenCalled();
     expect(extractTarSpy).toHaveBeenCalled();
@@ -421,25 +421,25 @@ describe('setup-go', () => {
     os.platform = 'linux';
     os.arch = 'x64';
 
-    let versionSpec = '1.12';
+    const versionSpec = '1.12';
 
     inputs['go-version'] = versionSpec;
     inputs['token'] = 'faketoken';
 
-    let expectedUrl =
+    const expectedUrl =
       'https://github.com/actions/go-versions/releases/download/1.12.17-20200616.21/go-1.12.17-linux-x64.tar.gz';
 
     // ... but not in the local cache
     findSpy.mockImplementation(() => '');
 
     dlSpy.mockImplementation(async () => '/some/temp/path');
-    let toolPath = path.normalize('/cache/go/1.12.17/x64');
+    const toolPath = path.normalize('/cache/go/1.12.17/x64');
     extractTarSpy.mockImplementation(async () => '/some/other/temp/path');
     cacheSpy.mockImplementation(async () => toolPath);
 
     await main.run();
 
-    let expPath = path.join(toolPath, 'bin');
+    const expPath = path.join(toolPath, 'bin');
 
     expect(dlSpy).toHaveBeenCalled();
     expect(extractTarSpy).toHaveBeenCalled();
@@ -458,7 +458,7 @@ describe('setup-go', () => {
     os.platform = 'linux';
     os.arch = 'x64';
 
-    let versionSpec = '1.12.14';
+    const versionSpec = '1.12.14';
 
     inputs['go-version'] = versionSpec;
     inputs['token'] = 'faketoken';
@@ -467,13 +467,13 @@ describe('setup-go', () => {
     findSpy.mockImplementation(() => '');
 
     dlSpy.mockImplementation(async () => '/some/temp/path');
-    let toolPath = path.normalize('/cache/go/1.12.14/x64');
+    const toolPath = path.normalize('/cache/go/1.12.14/x64');
     extractTarSpy.mockImplementation(async () => '/some/other/temp/path');
     cacheSpy.mockImplementation(async () => toolPath);
 
     await main.run();
 
-    let expPath = path.join(toolPath, 'bin');
+    const expPath = path.join(toolPath, 'bin');
     expect(logSpy).toHaveBeenCalledWith('Setup go version spec 1.12.14');
     expect(findSpy).toHaveBeenCalled();
     expect(logSpy).toHaveBeenCalledWith('Attempting to download 1.12.14...');
@@ -489,7 +489,7 @@ describe('setup-go', () => {
   });
 
   it('reports a failed download', async () => {
-    let errMsg = 'unhandled download message';
+    const errMsg = 'unhandled download message';
     os.platform = 'linux';
     os.arch = 'x64';
 
@@ -510,7 +510,7 @@ describe('setup-go', () => {
     whichSpy.mockImplementation(async () => {
       return '';
     });
-    let added = await main.addBinToPath();
+    const added = await main.addBinToPath();
     expect(added).toBeFalsy();
   });
 
@@ -528,8 +528,8 @@ describe('setup-go', () => {
       return false;
     });
 
-    let added = await main.addBinToPath();
+    const added = await main.addBinToPath();
-    expect(added).toBeTruthy;
+    expect(added).toBeTruthy();
   });
 
   interface Annotation {
@@ -543,9 +543,9 @@ describe('setup-go', () => {
   // problem matcher regex pattern tests
 
   function testMatch(line: string): Annotation {
-    let annotation = <Annotation>{};
+    const annotation = <Annotation>{};
 
-    let match = matcherRegExp.exec(line);
+    const match = matcherRegExp.exec(line);
     if (match) {
       annotation.line = parseInt(match[matcherPattern.line], 10);
       annotation.column = parseInt(match[matcherPattern.column], 10);
@@ -557,8 +557,8 @@ describe('setup-go', () => {
   }
 
   it('matches on relative unix path', async () => {
-    let line = './main.go:13:2: undefined: fmt.Printl';
+    const line = './main.go:13:2: undefined: fmt.Printl';
-    let annotation = testMatch(line);
+    const annotation = testMatch(line);
     expect(annotation).toBeDefined();
     expect(annotation.line).toBe(13);
     expect(annotation.column).toBe(2);
@@ -567,8 +567,8 @@ describe('setup-go', () => {
   });
 
   it('matches on unix path up the tree', async () => {
-    let line = '../main.go:13:2: undefined: fmt.Printl';
+    const line = '../main.go:13:2: undefined: fmt.Printl';
-    let annotation = testMatch(line);
+    const annotation = testMatch(line);
     expect(annotation).toBeDefined();
     expect(annotation.line).toBe(13);
     expect(annotation.column).toBe(2);
@@ -577,8 +577,8 @@ describe('setup-go', () => {
   });
 
   it('matches on unix path down the tree', async () => {
-    let line = 'foo/main.go:13:2: undefined: fmt.Printl';
+    const line = 'foo/main.go:13:2: undefined: fmt.Printl';
-    let annotation = testMatch(line);
+    const annotation = testMatch(line);
     expect(annotation).toBeDefined();
     expect(annotation.line).toBe(13);
     expect(annotation.column).toBe(2);
@@ -587,8 +587,8 @@ describe('setup-go', () => {
   });
 
   it('matches on rooted unix path', async () => {
-    let line = '/assert.go:4:1: missing return at end of function';
+    const line = '/assert.go:4:1: missing return at end of function';
-    let annotation = testMatch(line);
+    const annotation = testMatch(line);
     expect(annotation).toBeDefined();
     expect(annotation.line).toBe(4);
     expect(annotation.column).toBe(1);
@@ -597,8 +597,8 @@ describe('setup-go', () => {
   });
 
   it('matches on unix path with spaces', async () => {
-    let line = '   ./assert.go:5:2: missing return at end of function   ';
+    const line = '   ./assert.go:5:2: missing return at end of function   ';
-    let annotation = testMatch(line);
+    const annotation = testMatch(line);
     expect(annotation).toBeDefined();
     expect(annotation.line).toBe(5);
     expect(annotation.column).toBe(2);
@@ -607,8 +607,8 @@ describe('setup-go', () => {
   });
 
   it('matches on unix path with tabs', async () => {
-    let line = '\t./assert.go:5:2: missing return at end of function   ';
+    const line = '\t./assert.go:5:2: missing return at end of function   ';
-    let annotation = testMatch(line);
+    const annotation = testMatch(line);
     expect(annotation).toBeDefined();
     expect(annotation.line).toBe(5);
     expect(annotation.column).toBe(2);
@@ -617,8 +617,8 @@ describe('setup-go', () => {
   });
 
   it('matches on relative windows path', async () => {
-    let line = '.\\main.go:13:2: undefined: fmt.Printl';
+    const line = '.\\main.go:13:2: undefined: fmt.Printl';
-    let annotation = testMatch(line);
+    const annotation = testMatch(line);
     expect(annotation).toBeDefined();
     expect(annotation.line).toBe(13);
     expect(annotation.column).toBe(2);
@@ -627,8 +627,8 @@ describe('setup-go', () => {
   });
 
   it('matches on windows path up the tree', async () => {
-    let line = '..\\main.go:13:2: undefined: fmt.Printl';
+    const line = '..\\main.go:13:2: undefined: fmt.Printl';
-    let annotation = testMatch(line);
+    const annotation = testMatch(line);
     expect(annotation).toBeDefined();
     expect(annotation.line).toBe(13);
     expect(annotation.column).toBe(2);
@@ -730,7 +730,7 @@ describe('setup-go', () => {
       os.platform = 'linux';
       os.arch = 'x64';
 
-      let versionSpec = '1.13';
+      const versionSpec = '1.13';
 
       inputs['go-version'] = versionSpec;
       inputs['check-latest'] = true;
@@ -741,13 +741,13 @@ describe('setup-go', () => {
       findSpy.mockImplementation(() => '');
 
       dlSpy.mockImplementation(async () => '/some/temp/path');
-      let toolPath = path.normalize('/cache/go/1.13.7/x64');
+      const toolPath = path.normalize('/cache/go/1.13.7/x64');
       extractTarSpy.mockImplementation(async () => '/some/other/temp/path');
       cacheSpy.mockImplementation(async () => toolPath);
 
       await main.run();
 
-      let expPath = path.join(toolPath, 'bin');
+      const expPath = path.join(toolPath, 'bin');
 
       expect(dlSpy).toHaveBeenCalled();
       expect(extractTarSpy).toHaveBeenCalled();
@@ -767,7 +767,7 @@ describe('setup-go', () => {
       os.platform = 'linux';
       os.arch = 'x64';
 
-      let versionSpec = '1.13';
+      const versionSpec = '1.13';
 
       process.env['GITHUB_PATH'] = '';
 
@@ -784,13 +784,13 @@ describe('setup-go', () => {
       getAllVersionsSpy.mockImplementationOnce(() => undefined);
 
       dlSpy.mockImplementation(async () => '/some/temp/path');
-      let toolPath = path.normalize('/cache/go/1.13.7/x64');
+      const toolPath = path.normalize('/cache/go/1.13.7/x64');
       extractTarSpy.mockImplementation(async () => '/some/other/temp/path');
       cacheSpy.mockImplementation(async () => toolPath);
 
       await main.run();
 
-      let expPath = path.join(toolPath, 'bin');
+      const expPath = path.join(toolPath, 'bin');
 
       expect(logSpy).toHaveBeenCalledWith(
         `Failed to resolve version ${versionSpec} from manifest`
@@ -910,7 +910,7 @@ use .
         inputs['go-version'] = version;
         inputs['architecture'] = arch;
 
-        let expectedUrl =
+        const expectedUrl =
           platform === 'win32'
             ? `https://github.com/actions/go-versions/releases/download/${version}/go-${version}-${platform}-${arch}.${fileExtension}`
             : `https://storage.googleapis.com/golang/go${version}.${osSpec}-${arch}.${fileExtension}`;
@@ -919,7 +919,7 @@ use .
         findSpy.mockImplementation(() => '');
 
         dlSpy.mockImplementation(async () => '/some/temp/path');
-        let toolPath = path.normalize(`/cache/go/${version}/${arch}`);
+        const toolPath = path.normalize(`/cache/go/${version}/${arch}`);
         cacheSpy.mockImplementation(async () => toolPath);
 
         await main.run();
@@ -944,7 +944,7 @@ use .
         findSpy.mockImplementation(() => '');
 
         dlSpy.mockImplementation(async () => '/some/temp/path');
-        let toolPath = path.normalize(`/cache/go/${alias}/${arch}`);
+        const toolPath = path.normalize(`/cache/go/${alias}/${arch}`);
         cacheSpy.mockImplementation(async () => toolPath);
 
         await main.run();

dist/cache-save/index.js

@@ -60457,7 +60457,7 @@ const getPackageManagerInfo = (packageManager) => __awaiter(void 0, void 0, void
 });
 exports.getPackageManagerInfo = getPackageManagerInfo;
 const getCacheDirectoryPath = (packageManagerInfo) => __awaiter(void 0, void 0, void 0, function* () {
-    const pathList = yield Promise.all(packageManagerInfo.cacheFolderCommandList.map(command => exports.getCommandOutput(command)));
+    const pathList = yield Promise.all(packageManagerInfo.cacheFolderCommandList.map((command) => __awaiter(void 0, void 0, void 0, function* () { return exports.getCommandOutput(command); })));
     const cachePaths = pathList.filter(item => item);
     if (!cachePaths.length) {
         throw new Error(`Could not get cache folder paths.`);

dist/setup/index.js

@@ -63058,7 +63058,7 @@ const restoreCache = (versionSpec, packageManager, cacheDependencyPath) => __awa
 });
 exports.restoreCache = restoreCache;
 const findDependencyFile = (packageManager) => {
-    let dependencyFile = packageManager.dependencyFilePattern;
+    const dependencyFile = packageManager.dependencyFilePattern;
     const workspace = process.env.GITHUB_WORKSPACE;
     const rootContent = fs_1.default.readdirSync(workspace);
     const goSumFileExists = rootContent.includes(dependencyFile);
@@ -63130,7 +63130,7 @@ const getPackageManagerInfo = (packageManager) => __awaiter(void 0, void 0, void
 });
 exports.getPackageManagerInfo = getPackageManagerInfo;
 const getCacheDirectoryPath = (packageManagerInfo) => __awaiter(void 0, void 0, void 0, function* () {
-    const pathList = yield Promise.all(packageManagerInfo.cacheFolderCommandList.map(command => exports.getCommandOutput(command)));
+    const pathList = yield Promise.all(packageManagerInfo.cacheFolderCommandList.map((command) => __awaiter(void 0, void 0, void 0, function* () { return exports.getCommandOutput(command); })));
     const cachePaths = pathList.filter(item => item);
     if (!cachePaths.length) {
         throw new Error(`Could not get cache folder paths.`);
@@ -63229,7 +63229,7 @@ const utils_1 = __nccwpck_require__(1314);
 function getGo(versionSpec, checkLatest, auth, arch = os_1.default.arch()) {
     return __awaiter(this, void 0, void 0, function* () {
         let manifest;
-        let osPlat = os_1.default.platform();
+        const osPlat = os_1.default.platform();
         if (versionSpec === utils_1.StableReleaseAlias.Stable ||
             versionSpec === utils_1.StableReleaseAlias.OldStable) {
             manifest = yield getManifest(auth);
@@ -63255,8 +63255,7 @@ function getGo(versionSpec, checkLatest, auth, arch = os_1.default.arch()) {
             }
         }
         // check cache
-        let toolPath;
+        const toolPath = tc.find('go', versionSpec, arch);
-        toolPath = tc.find('go', versionSpec, arch);
         // If not found in cache, download
         if (toolPath) {
             core.info(`Found in cache @ ${toolPath}`);
@@ -63382,12 +63381,11 @@ function getInfoFromManifest(versionSpec, stable, auth, arch = os_1.default.arch
 exports.getInfoFromManifest = getInfoFromManifest;
 function getInfoFromDist(versionSpec, arch) {
     return __awaiter(this, void 0, void 0, function* () {
-        let version;
+        const version = yield findMatch(versionSpec, arch);
-        version = yield findMatch(versionSpec, arch);
         if (!version) {
             return null;
         }
-        let downloadUrl = `https://storage.googleapis.com/golang/${version.files[0].filename}`;
+        const downloadUrl = `https://storage.googleapis.com/golang/${version.files[0].filename}`;
         return {
             type: 'dist',
             downloadUrl: downloadUrl,
@@ -63409,8 +63407,8 @@ function findMatch(versionSpec, arch = os_1.default.arch()) {
         }
         let goFile;
         for (let i = 0; i < candidates.length; i++) {
-            let candidate = candidates[i];
+            const candidate = candidates[i];
-            let version = makeSemver(candidate.version);
+            const version = makeSemver(candidate.version);
             core.debug(`check ${version} satisfies ${versionSpec}`);
             if (semver.satisfies(version, versionSpec)) {
                 goFile = candidate.files.find(file => {
@@ -63454,8 +63452,8 @@ function makeSemver(version) {
     var _a;
     version = version.replace('go', '');
     version = version.replace('beta', '-beta.').replace('rc', '-rc.');
-    let parts = version.split('-');
+    const parts = version.split('-');
-    let semVersion = (_a = semver.coerce(parts[0])) === null || _a === void 0 ? void 0 : _a.version;
+    const semVersion = (_a = semver.coerce(parts[0])) === null || _a === void 0 ? void 0 : _a.version;
     if (!semVersion) {
         throw new Error(`The version: ${version} can't be changed to SemVer notation`);
     }
@@ -63481,8 +63479,8 @@ function parseGoVersionFile(versionFilePath) {
 exports.parseGoVersionFile = parseGoVersionFile;
 function resolveStableVersionDist(versionSpec, arch) {
     return __awaiter(this, void 0, void 0, function* () {
-        let archFilter = sys.getArch(arch);
+        const archFilter = sys.getArch(arch);
-        let platFilter = sys.getPlatform();
+        const platFilter = sys.getPlatform();
         const dlUrl = 'https://golang.org/dl/?mode=json&include=all';
         const candidates = yield module.exports.getVersionsDist(dlUrl);
         if (!candidates) {
@@ -63585,8 +63583,8 @@ function run() {
                 arch = os_1.default.arch();
             }
             if (versionSpec) {
-                let token = core.getInput('token');
+                const token = core.getInput('token');
-                let auth = !token ? undefined : `token ${token}`;
+                const auth = !token ? undefined : `token ${token}`;
                 const checkLatest = core.getBooleanInput('check-latest');
                 const installDir = yield installer.getGo(versionSpec, checkLatest, auth, arch);
                 const installDirVersion = path_1.default.basename(path_1.default.dirname(installDir));
@@ -63598,12 +63596,12 @@ function run() {
                     core.info('Setting GOROOT for Go version < 1.9');
                     core.exportVariable('GOROOT', installDir);
                 }
-                let added = yield addBinToPath();
+                const added = yield addBinToPath();
                 core.debug(`add bin ${added}`);
                 core.info(`Successfully set up Go version ${versionSpec}`);
             }
-            let goPath = yield io.which('go');
+            const goPath = yield io.which('go');
-            let goVersion = (child_process_1.default.execSync(`${goPath} version`) || '').toString();
+            const goVersion = (child_process_1.default.execSync(`${goPath} version`) || '').toString();
             if (cache && cache_utils_1.isCacheFeatureAvailable()) {
                 const packageManager = 'default';
                 const cacheDependencyPath = core.getInput('cache-dependency-path');
@@ -63616,7 +63614,7 @@ function run() {
             core.info(goVersion);
             core.setOutput('go-version', parseGoVersion(goVersion));
             core.startGroup('go env');
-            let goEnv = (child_process_1.default.execSync(`${goPath} env`) || '').toString();
+            const goEnv = (child_process_1.default.execSync(`${goPath} env`) || '').toString();
             core.info(goEnv);
             core.endGroup();
         }
@@ -63629,22 +63627,22 @@ exports.run = run;
 function addBinToPath() {
     return __awaiter(this, void 0, void 0, function* () {
         let added = false;
-        let g = yield io.which('go');
+        const g = yield io.which('go');
         core.debug(`which go :${g}:`);
         if (!g) {
             core.debug('go not in the path');
             return added;
         }
-        let buf = child_process_1.default.execSync('go env GOPATH');
+        const buf = child_process_1.default.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_1.default.existsSync(gp)) {
                 // some of the hosted images have go install but not profile dir
                 core.debug(`creating ${gp}`);
                 yield io.mkdirP(gp);
             }
-            let bp = path_1.default.join(gp, 'bin');
+            const bp = path_1.default.join(gp, 'bin');
             if (!fs_1.default.existsSync(bp)) {
                 core.debug(`creating ${bp}`);
                 yield io.mkdirP(bp);
@@ -63703,18 +63701,21 @@ exports.supportedPackageManagers = {
 /***/ }),
 
 /***/ 4300:
-/***/ ((__unused_webpack_module, exports, __nccwpck_require__) => {
+/***/ (function(__unused_webpack_module, exports, __nccwpck_require__) {
 
 "use strict";
 
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
 Object.defineProperty(exports, "__esModule", ({ value: true }));
 exports.getArch = exports.getPlatform = void 0;
-const os = __nccwpck_require__(2037);
+const os_1 = __importDefault(__nccwpck_require__(2037));
 function getPlatform() {
     // darwin and linux match already
     // freebsd not supported yet but future proofed.
     // 'aix', 'darwin', 'freebsd', 'linux', 'openbsd', 'sunos', and 'win32'
-    let plat = os.platform();
+    let plat = os_1.default.platform();
     // wants 'darwin', 'freebsd', 'linux', 'windows'
     if (plat === 'win32') {
         plat = 'windows';

package.json

@@ -6,9 +6,10 @@
   "main": "lib/setup-go.js",
   "scripts": {
     "build": "tsc && ncc build -o dist/setup src/setup-go.ts && ncc build -o dist/cache-save src/cache-save.ts",
-    "format": "prettier --write **/*.ts",
+    "format": "prettier --config ./.prettierrc.js --write **/*.{ts,yml,yaml}",
-    "format-check": "prettier --check **/*.ts",
+    "format-check": "prettier --config ./.prettierrc.js --check **/*.{ts,yml,yaml}",
-    "lint": "echo \"Fake command that does nothing. It is used in reusable workflows\"",
+    "lint": "eslint --config ./.eslintrc.js **/*.ts",
+    "lint:fix": "eslint --config ./.eslintrc.js **/*.ts --fix",
     "test": "jest --coverage",
     "pre-checkin": "npm run format && npm run build && npm test"
   },
@@ -37,11 +38,15 @@
     "@types/jest": "^27.0.2",
     "@types/node": "^16.11.25",
     "@types/semver": "^6.0.0",
+    "@typescript-eslint/eslint-plugin": "^5.54.0",
     "@vercel/ncc": "^0.33.4",
+    "eslint": "^8.35.0",
+    "eslint-config-prettier": "^8.6.0",
+    "eslint-plugin-jest": "^27.2.1",
     "jest": "^27.2.5",
     "jest-circus": "^27.2.5",
     "nock": "^10.0.6",
-    "prettier": "^1.17.1",
+    "prettier": "^2.8.4",
     "ts-jest": "^27.0.5",
     "typescript": "^4.3.3"
   }

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;
+  const toolPath = tc.find('go', versionSpec, arch);
-  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;
+  const version: IGoVersion | undefined = await findMatch(versionSpec, arch);
-  version = 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];
+    const candidate: IGoVersion = candidates[i];
-    let version = makeSemver(candidate.version);
+    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);
+  const archFilter = sys.getArch(arch);
-  let platFilter = sys.getPlatform();
+  const platFilter = sys.getPlatform();
-  const dlUrl: string = 'https://golang.org/dl/?mode=json&include=all';
+  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');
+      const token = core.getInput('token');
-      let auth = !token ? undefined : `token ${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');
+    const goPath = await io.which('go');
-    let goVersion = (cp.execSync(`${goPath} version`) || '').toString();
+    const goVersion = (cp.execSync(`${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

tsconfig.json

@@ -46,6 +46,7 @@
     // "types": [],                           /* Type declaration files to be included in compilation. */
     // "allowSyntheticDefaultImports": true,  /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
     "esModuleInterop": true,                  /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
+    "resolveJsonModule": true,                /* Allows importing modules with a '.json' extension, which is a common practice in node projects. */
     "sourceMap": true,
     // "preserveSymlinks": true,              /* Do not resolve the real path of symlinks. */
     // "allowUmdGlobalAccess": true,          /* Allow accessing UMD globals from modules. */