build: add the GJS ESLint flat config and lint script

.gitignore

@@ -10,6 +10,11 @@ strata@edu4rdshl.dev/bin/
 # External reference code (not part of this project)
 external_sources/
 
+# Node / lint tooling
+node_modules/
+package-lock.json
+*.shell-extension.zip
+
 # Editor / OS
 .vscode/
 .idea/

eslint.config.js

@@ -0,0 +1,149 @@
+// 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',
+                // GNOME Shell Only
+                global: 'readonly',
+                _: 'readonly',
+                C_: 'readonly',
+                N_: 'readonly',
+                ngettext: '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()',
+                },
+            ],
+        },
+    },
+];

package.json

@@ -0,0 +1,14 @@
+{
+  "name": "strata-extension",
+  "version": "0.9.0",
+  "description": "Lint tooling for the Strata GNOME Shell extension",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "lint": "eslint 'strata@edu4rdshl.dev'"
+  },
+  "devDependencies": {
+    "@eslint/js": "^10.0.0",
+    "eslint": "^10.0.0"
+  }
+}