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

.eslintignore

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

.eslintrc.js

@@ -0,0 +1,49 @@
+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-non-null-assertion': 'off',
+    '@typescript-eslint/no-explicit-any': 'off',
+    '@typescript-eslint/no-empty-function': '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',
+        'jest/no-standalone-expect': 'off',
+        'jest/no-conditional-expect': 'off',
+        'no-console': 'off',
+
+      }
+    }
+  ],
+  env: {
+    node: true,
+    es6: true,
+    'jest/globals': true
+  }
+};

.gitattributes

@@ -1,2 +1,2 @@
-* text=auto
+* text=auto eol=lf
 .licenses/** -diff linguist-generated=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 
-    uses: actions/reusable-workflows/.github/workflows/codeql-analysis.yml@main
+    name: CodeQL analysis
+    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
-          architecture: x32
+          - os: macos-latest
+            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 +1,10 @@
+module.exports = {
+  printWidth: 80,
+  tabWidth: 2,
+  useTabs: false,
+  semi: true,
+  singleQuote: true,
+  trailingComma: 'none',
+  bracketSpacing: false,
+  arrowParens: 'avoid'
+};

__tests__/cache-restore.test.ts

@@ -8,14 +8,14 @@ import {PackageManagerInfo} from '../src/package-managers';
 
 describe('restoreCache', () => {
   //Arrange
-  let hashFilesSpy = jest.spyOn(glob, 'hashFiles');
-  let getCacheDirectoryPathSpy = jest.spyOn(
+  const hashFilesSpy = jest.spyOn(glob, 'hashFiles');
+  const getCacheDirectoryPathSpy = jest.spyOn(
     cacheUtils,
     'getCacheDirectoryPath'
   );
-  let restoreCacheSpy = jest.spyOn(cache, 'restoreCache');
-  let infoSpy = jest.spyOn(core, 'info');
-  let setOutputSpy = jest.spyOn(core, 'setOutput');
+  const restoreCacheSpy = jest.spyOn(cache, 'restoreCache');
+  const infoSpy = jest.spyOn(core, 'info');
+  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();
   });
@@ -62,15 +62,15 @@ describe('getPackageManagerInfo', () => {
     const packageManagerName = 'invalidName';
 
     //Act + Assert
-    expect(async () => {
+    await expect(async () => {
       await cacheUtils.getPackageManagerInfo(packageManagerName);
     }).rejects.toThrow();
   });
 });
 
 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();
   });
@@ -136,41 +136,39 @@ describe('getCacheDirectoryPath', () => {
     });
 
     //Act + Assert
-    expect(async () => {
+    await expect(async () => {
       await cacheUtils.getCacheDirectoryPath(validPackageManager);
     }).rejects.toThrow();
   });
 });
 
 describe('isCacheFeatureAvailable', () => {
   //Arrange
-  let isFeatureAvailableSpy = jest.spyOn(cache, 'isFeatureAvailable');
-  let warningSpy = jest.spyOn(core, 'warning');
+  const isFeatureAvailableSpy = jest.spyOn(cache, 'isFeatureAvailable');
+  const warningSpy = jest.spyOn(core, 'warning');
 
   it('should return true when cache feature is available', () => {
     //Arrange
     isFeatureAvailableSpy.mockImplementation(() => {
       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;
     });
 
     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