Add linting

.editorconfig

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+# EditorConfig is awesome: https://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.js]
+quote_type = single

.eslint.config.js

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+// SPDX-License-Identifier: CC0-1.0
+// SPDX-FileCopyrightText: No rights reserved
+
+import js from '@eslint/js';
+
+export default [
+    js.configs.recommended,
+    {
+        languageOptions: {
+            globals: {
+                ARGV: 'readonly',
+                Debugger: 'readonly',
+                GIRepositoryGType: 'readonly',
+                globalThis: 'readonly',
+                imports: 'readonly',
+                Intl: 'readonly',
+                log: 'readonly',
+                logError: 'readonly',
+                pkg: 'readonly',
+                print: 'readonly',
+                printerr: 'readonly',
+                window: 'readonly',
+                TextEncoder: 'readonly',
+                TextDecoder: 'readonly',
+                console: 'readonly',
+                setTimeout: 'readonly',
+                setInterval: 'readonly',
+                clearTimeout: 'readonly',
+                clearInterval: 'readonly',
+            },
+            parserOptions: {
+                ecmaVersion: 2022,
+                sourceType: 'module',
+            },
+        },
+        rules: {
+            // See: https://eslint.org/docs/latest/rules/#possible-problems
+            'array-callback-return': 'error',
+            'no-await-in-loop': 'error',
+            'no-constant-binary-expression': 'error',
+            'no-constructor-return': 'error',
+            'no-new-native-nonconstructor': 'error',
+            'no-promise-executor-return': 'error',
+            'no-self-compare': 'error',
+            'no-template-curly-in-string': 'error',
+            'no-unmodified-loop-condition': 'error',
+            'no-unreachable-loop': 'error',
+            'no-unused-private-class-members': 'error',
+            'no-use-before-define': [
+                'error',
+                {
+                    functions: false,
+                    classes: true,
+                    variables: true,
+                    allowNamedExports: true,
+                },
+            ],
+            // See: https://eslint.org/docs/latest/rules/#suggestions
+            'block-scoped-var': 'error',
+            'complexity': 'warn',
+            'consistent-return': 'error',
+            'default-param-last': 'error',
+            'eqeqeq': 'error',
+            'no-array-constructor': 'error',
+            'no-caller': 'error',
+            'no-extend-native': 'error',
+            'no-extra-bind': 'error',
+            'no-extra-label': 'error',
+            'no-iterator': 'error',
+            'no-label-var': 'error',
+            'no-loop-func': 'error',
+            'no-multi-assign': 'warn',
+            'no-new-object': 'error',
+            'no-new-wrappers': 'error',
+            'no-proto': 'error',
+            'no-shadow': 'warn',
+            'no-unused-vars': [
+                'error',
+                {
+                    varsIgnorePattern: '^_',
+                    argsIgnorePattern: '^_',
+                },
+            ],
+            'no-var': 'warn',
+            'unicode-bom': 'error',
+            // GJS Restrictions
+            'no-restricted-globals': [
+                'error',
+                {
+                    name: 'Debugger',
+                    message: 'Internal use only',
+                },
+                {
+                    name: 'GIRepositoryGType',
+                    message: 'Internal use only',
+                },
+                {
+                    name: 'log',
+                    message: 'Use console.log()',
+                },
+                {
+                    name: 'logError',
+                    message: 'Use console.warn() or console.error()',
+                },
+            ],
+            'no-restricted-properties': [
+                'error',
+                {
+                    object: 'imports',
+                    property: 'format',
+                    message: 'Use template strings',
+                },
+                {
+                    object: 'pkg',
+                    property: 'initFormat',
+                    message: 'Use template strings',
+                },
+                {
+                    object: 'Lang',
+                    property: 'copyProperties',
+                    message: 'Use Object.assign()',
+                },
+                {
+                    object: 'Lang',
+                    property: 'bind',
+                    message: 'Use arrow notation or Function.prototype.bind()',
+                },
+                {
+                    object: 'Lang',
+                    property: 'Class',
+                    message: 'Use ES6 classes',
+                },
+            ],
+            'no-restricted-syntax': [
+                'error',
+                {
+                    selector: 'MethodDefinition[key.name="_init"] CallExpression[arguments.length<=1][callee.object.type="Super"][callee.property.name="_init"]',
+                    message: 'Use constructor() and super()',
+                },
+            ],
+        },
+    },
+];

.github/workflows/eslint.yml

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+name: ESLint
+
+on:
+  push:
+    branches: [ 'main' ]
+  pull_request:
+    branches: [ 'main' ]
+  schedule:
+    - cron: '33 14 * * 5'
+
+jobs:
+  eslint:
+    name: Run eslint scanning
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      security-events: write
+      # Required for private repositories by github/codeql-action/upload-sarif
+      actions: read
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Install
+        run: |
+          npm install eslint@^8.0.0
+          npm install @microsoft/[email protected]
+
+      - name: Lint
+        run: npx eslint .
+          --format @microsoft/eslint-formatter-sarif
+          --output-file eslint-results.sarif
+        continue-on-error: true
+
+      - name: Report
+        uses: github/codeql-action/upload-sarif@v2
+        with:
+          sarif_file: eslint-results.sarif
+          wait-for-processing: true

package.json

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+{
+  "name": "gnome-shell-extensions-gravatar",
+  "version": "1.0.0",
+  "description": "Synchronize user icon with Gravatar",
+  "main": "index.js",
+  "directories": {
+    "lib": "lib"
+  },
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "."
+  },
+  "author": "Daniel Sheeler",
+  "license": "MIT",
+  "devDependencies": {
+    "@eslint/eslintrc": "^3.0.2",
+    "@eslint/js": "^9.3.0",
+    "eslint": "^8.57.0",
+    "eslint-config-standard": "^17.1.0",
+    "eslint-plugin-import": "^2.29.1",
+    "eslint-plugin-n": "^16.6.2",
+    "eslint-plugin-promise": "^6.1.1",
+    "globals": "^15.0.0"
+  }
+}