Added linter yml and fix lint issues

.eslintrc.js

@@ -0,0 +1,51 @@
+/*
+  This program and the accompanying materials are
+  made available under the terms of the Eclipse Public License v2.0 which accompanies
+  this distribution, and is available at https://www.eclipse.org/legal/epl-v20.html
+
+  SPDX-License-Identifier: EPL-2.0
+
+  Copyright Contributors to the Zowe Project.
+*/
+
+module.exports = {
+  env: {
+    browser: true,
+    es6: true,
+    node: true
+  },
+  globals: {
+    describe: 'readonly',
+    it: 'readonly',
+    before: 'readonly',
+    after: 'readonly',
+    beforeEach: 'readonly',
+    afterEach: 'readonly',
+  },
+  ignorePatterns: ['.github/**/*.yml', '**/.build', '**/build', '**/dist', '**/node_modules', '**/release', '**/lib','**/test/yaml-loader'],
+  extends: [
+    'eslint:recommended',
+    'plugin:@typescript-eslint/eslint-recommended',
+    'plugin:@typescript-eslint/recommended',
+    'plugin:import/recommended',
+    'plugin:import/typescript'
+  ],
+  parser: '@typescript-eslint/parser',
+  plugins: ['header'],
+  rules: {
+    'import/no-unresolved': 'off',
+    '@typescript-eslint/no-var-requires': 'off',
+    '@typescript-eslint/no-explicit-any': 'off',
+    'header/header': [
+      2,         // Error level
+      'block',   // Location
+     [
+        '\n  This program and the accompanying materials are' +
+       '\n  made available under the terms of the Eclipse Public License v2.0 which accompanies' +
+       '\n  this distribution, and is available at https://www.eclipse.org/legal/epl-v20.html' +
+       '\n  \n  SPDX-License-Identifier: EPL-2.0\n  \n  Copyright Contributors to the Zowe Project.\n'
+     ],
+      2,
+    ],
+  },
+}

.github/workflows/test-lint.yml

@@ -0,0 +1,26 @@
+name: Lint TypeScript
+
+on:
+  push:
+    branches:
+      - v2.x/staging
+  pull_request:
+    types: [opened, reopened, synchronize]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v2
+        with:
+          node-version: '18'
+
+      - name: Install Dependencies
+        run: npm ci
+
+      - name: Lint TypeScript
+        run: npm run lint

CHANGELOG.md

@@ -5,6 +5,7 @@ This repo is part of the app-server Zowe Component, and the change logs here may
 
 ## 2.12.0
 
+- Enhancement: added test-linter.yml to catch all linting issues whenever PR is open and fixed all existing linting issues.
 - Enhancement: Auth plugins that are not requested by any dataservice found at startup are no longer loaded by the server.
 
 ## 2.11.0