Use eslint 9

eslint.config.mjs

@@ -0,0 +1,63 @@
+import prettier from 'eslint-plugin-prettier';
+import unicorn from 'eslint-plugin-unicorn';
+import globals from 'globals';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+import js from '@eslint/js';
+import { FlatCompat } from '@eslint/eslintrc';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+const compat = new FlatCompat({
+  baseDirectory: __dirname,
+  recommendedConfig: js.configs.recommended,
+  allConfig: js.configs.all
+});
+
+export default [
+  {
+    ignores: [
+      'browserscripts/*',
+      'tools/*',
+      'test/data/*',
+      'docker/webpagereplay/*',
+      'vendor/*'
+    ]
+  },
+  ...compat.extends('eslint:recommended', 'plugin:unicorn/recommended'),
+  {
+    plugins: {
+      prettier,
+      unicorn
+    },
+
+    languageOptions: {
+      globals: {
+        ...globals.node
+      },
+
+      ecmaVersion: 'latest',
+      sourceType: 'module'
+    },
+
+    rules: {
+      'prettier/prettier': [
+        'error',
+        {
+          singleQuote: true,
+          trailingComma: 'none',
+          arrowParens: 'avoid',
+          embeddedLanguageFormatting: 'off'
+        }
+      ],
+
+      'no-extra-semi': 'off',
+      'no-mixed-spaces-and-tabs': 'off',
+      'no-unexpected-multiline': 'off',
+      'no-return-await': 'error',
+      'require-atomic-updates': 'off',
+      'unicorn/filename-case': 'off',
+      'unicorn/prevent-abbreviations': 'off'
+    }
+  }
+];

lib/chrome/networkManager.js

@@ -31,7 +31,7 @@ export class NetworkManager {
 
   async waitForNetworkIdle() {
     const startTime = Date.now();
-    // eslint-disable-next-line no-constant-condition
+
     while (true) {
       const now = Date.now();
       const sinceLastResponseRequest =

lib/core/engine/command/measure.js

@@ -435,7 +435,8 @@ export class Measure {
 
     const alias = this.options.urlMetaData
       ? this.options.urlMetaData[url]
-      : undefined || this.result[this.numberOfMeasuredPages].alias;
+      : // eslint-disable-next-line no-constant-binary-expression
+        undefined || this.result[this.numberOfMeasuredPages].alias;
     const res = await this.engineDelegate.afterPageCompleteCheck(
       this.browser,
       this.index,

lib/firefox/networkManager.js

@@ -53,7 +53,7 @@ export class NetworkManager {
     });
 
     const startTime = Date.now();
-    // eslint-disable-next-line no-constant-condition
+
     while (true) {
       const now = Date.now();
       const sinceLastResponseRequest =