Update ESLint to v9 (#466)

* Update ESLint to v9

* Update network-idle.js

* Update network-idle.js

Author: XhmikosR

.eslintignore

@@ -1,5 +1,3 @@
-/* eslint-env serviceworker */
-
 'use strict';
 
 importScripts('https://unpkg.com/network-idle-callback@1.0.1/lib/request-monitor.js');

.eslintrc.js

@@ -0,0 +1,152 @@
+const {fixupConfigRules, fixupPluginRules} = require('@eslint/compat');
+const globals = require('globals');
+const googleConfig = require('eslint-config-google');
+const jsdocPlugin = require('eslint-plugin-jsdoc');
+const reactPlugin = require('eslint-plugin-react');
+
+const jsdocRecommended = jsdocPlugin.configs['flat/recommended'] || jsdocPlugin.configs.recommended;
+
+const [reactRecommended] = fixupConfigRules(reactPlugin.configs.recommended);
+const googleRules = {
+  ...googleConfig.rules,
+};
+delete googleRules['valid-jsdoc'];
+delete googleRules['require-jsdoc'];
+
+module.exports = [
+  {
+    ignores: [
+      '**/*.min.js',
+      '**/dist/',
+      '**/build/',
+      '**/vendor/',
+      'eslint.config.js',
+    ],
+  },
+  {
+    name: 'quicklink/base',
+    languageOptions: {
+      ecmaVersion: 2017,
+      sourceType: 'script',
+      parserOptions: {
+        ecmaFeatures: {
+          jsx: true,
+        },
+      },
+      globals: {
+        ...globals.browser,
+        ...globals.node,
+      },
+    },
+    plugins: {
+      react: fixupPluginRules(reactPlugin),
+    },
+    settings: {
+      react: {
+        version: 'detect',
+      },
+    },
+    rules: {
+      ...(reactRecommended?.rules ?? reactPlugin.configs.recommended.rules),
+      ...googleRules,
+      'max-len': [
+        'warn',
+        {
+          code: 130,
+        },
+      ],
+      'arrow-parens': [
+        'error',
+        'as-needed',
+      ],
+      'space-before-function-paren': [
+        'error',
+        {
+          anonymous: 'always',
+          named: 'never',
+        },
+      ],
+      'no-negated-condition': 'warn',
+      'no-const-assign': 'error',
+      'no-unused-vars': [
+        'error',
+        {
+          args: 'none',
+          varsIgnorePattern: '^_',
+          caughtErrorsIgnorePattern: '^_',
+        },
+      ],
+      'prefer-destructuring': [
+        'off',
+        {
+          object: true,
+          array: false,
+        },
+      ],
+      'prefer-template': 'error',
+      strict: [
+        'error',
+        'global',
+      ],
+      'spaced-comment': [
+        'error',
+        'always',
+        {
+          exceptions: [
+            '/',
+          ],
+        },
+      ],
+    },
+  },
+  {
+    files: [
+      'src/**',
+    ],
+    languageOptions: {
+      sourceType: 'module',
+    },
+    rules: {
+      strict: [
+        'error',
+        'never',
+      ],
+    },
+  },
+  ...(Array.isArray(jsdocRecommended) ? jsdocRecommended : [jsdocRecommended]),
+  {
+    files: [
+      'site/src/assets/js/**',
+    ],
+    languageOptions: {
+      sourceType: 'script',
+      globals: {
+        ...globals.browser,
+      },
+    },
+    rules: {
+      'jsdoc/require-jsdoc': 'off',
+      strict: [
+        'error',
+        'function',
+      ],
+    },
+  },
+  {
+    files: [
+      'site/src/demos/**',
+    ],
+    languageOptions: {
+      sourceType: 'module',
+      ecmaVersion: 2020,
+      globals: {
+        ...globals.browser,
+      },
+    },
+    rules: {
+      'jsdoc/require-jsdoc': 'off',
+      'strict': ['error', 'never'],
+      'max-len': 'off',
+    },
+  },
+];