chore: Upgrade to eslint9

README.md

@@ -92,6 +92,20 @@ or it is recommended to define a custom keyboard binding.
 }
 ``` 
 
+### Linting
+
+Run the linter:
+
+```bash
+npm run lint
+```
+
+Automatically fix fixable issues:
+
+```bash
+npm run lint:fix
+```
+
 Examples
 --------
 Examples showcasing usage of desktopJS for various containers and scenarios can be found under

eslint.config.mjs

@@ -0,0 +1,115 @@
+import eslint from '@eslint/js';
+import * as tsParser from '@typescript-eslint/parser';
+import tsPlugin from '@typescript-eslint/eslint-plugin';
+import eslintPluginImport from 'eslint-plugin-import';
+import eslintPluginN from 'eslint-plugin-n';
+import eslintPluginPromise from 'eslint-plugin-promise';
+import licenseHeader from 'eslint-plugin-license-header'; // Import the license header plugin
+import globals from 'globals'; // Import globals
+import path from 'node:path'; // Import path module
+import { fileURLToPath } from 'node:url'; // Import fileURLToPath
+
+// Derive __dirname in ES module scope
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+
+// Define the license header as an array of strings
+const LICENSE_HEADER = [
+    "/*",
+    " * Morgan Stanley makes this available to you under the Apache License,",
+    " * Version 2.0 (the \"License\"). You may obtain a copy of the License at",
+    " *",
+    " *      http://www.apache.org/licenses/LICENSE-2.0.",
+    " *",
+    " * See the NOTICE file distributed with this work for additional information",
+    " * regarding copyright ownership. Unless required by applicable law or agreed",
+    " * to in writing, software distributed under the License is distributed on an",
+    " * \"AS IS\" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express",
+    " * or implied. See the License for the specific language governing permissions",
+    " * and limitations under the License.",
+    " */"
+];
+
+export default [
+  {
+    // Global ignores
+    ignores: [
+        "**/dist/**",
+        "**/build/**",
+        "**/coverage/**",
+        "docs/**",
+        "examples/**", // Ignore all examples for now
+        "**/gulpfile.js",
+        "*.config.js", // Ignore JS config files
+        "*.config.mjs", // Ignore MJS config files
+        "vite.config.ts" // Ignore root vite config
+    ]
+  },
+  eslint.configs.recommended,
+  {
+    files: ['**/*.ts', '**/*.tsx'],
+    languageOptions: {
+      parser: tsParser,
+      parserOptions: {
+        // Instead of 'tsconfig.eslint.json', point to the updated test config
+        project: './tsconfig.test.json',
+        tsconfigRootDir: __dirname, // Important for resolving paths correctly
+      },
+      globals: {
+        ...globals.browser,
+        ...globals.node,
+        ...globals.es2021
+      }
+    },
+    plugins: {
+      '@typescript-eslint': tsPlugin,
+      import: eslintPluginImport,
+      n: eslintPluginN,
+      promise: eslintPluginPromise,
+      'license-header': licenseHeader // Add the license header plugin
+    },
+    rules: {
+      ...tsPlugin.configs.recommended.rules,
+      '@typescript-eslint/no-inferrable-types': ['error', { ignoreProperties: true, ignoreParameters: true }],
+      '@typescript-eslint/no-unused-vars': 'off',
+      '@typescript-eslint/no-explicit-any': 'off',
+      'no-console': 'error',
+      'no-undef': 'off',
+      'no-redeclare': 'off', // Disable base rule
+      '@typescript-eslint/no-redeclare': 'error', // Enable TS version (already included in recommended, but explicit)
+      'license-header/header': ['error', LICENSE_HEADER] // Update the license header rule to use the array
+    },
+  },
+  {
+    // Override for Electron source file allowing require
+    files: ['packages/desktopjs-electron/src/electron.ts'],
+    rules: {
+        '@typescript-eslint/no-require-imports': 'off'
+    }
+  },
+  {
+    // Override for spec files
+    files: ['**/*.spec.ts'],
+    // Exclude TS rules requiring type info for spec files if they cause issues
+    // Alternatively, ensure tsconfig.test.json includes them correctly
+    rules: {
+      '@typescript-eslint/ban-types': 'off',
+      '@typescript-eslint/no-empty-function': 'off',
+      'no-console': 'warn',
+    },
+  },
+  {
+    // Override for JS files (if any are linted)
+    files: ['**/*.js'],
+    languageOptions: {
+        globals: {
+            ...globals.browser,
+            ...globals.node
+        }
+    },
+    rules: {
+        'no-unused-vars': 'warn',
+        'no-undef': 'warn'
+    }
+  }
+];