[ticket/17517] Update and refactor eslint implementation

PHPBB-17517

eslint.config.mjs

@@ -0,0 +1,67 @@
+const { browser: browserGlobals, node: nodeGlobals, jquery: jqueryGlobals } = (await import('globals')).default;
+
+// File patterns to ignore
+const IGNORED_FILES = [
+	'phpBB/assets/javascript/cropper.js',
+	'phpBB/assets/javascript/hermite.js',
+	'phpBB/assets/javascript/jquery-cropper.js',
+	'phpBB/**/*.min.js',
+	'phpBB/vendor/**/*.js',
+	'phpBB/vendor-ext/**/*.js',
+	'phpBB/phpbb/**/*.js',
+	'phpBB/tests/**/*.js',
+];
+
+// ESLint rule configurations
+const FORMATTING_RULES = {
+	'quotes': ['error', 'single'],
+	'comma-dangle': ['error', 'always-multiline'],
+	'block-spacing': 'error',
+	'array-bracket-spacing': ['error', 'always'],
+	'object-curly-spacing': ['error', 'always'],
+	'space-before-function-paren': ['error', 'never'],
+	'space-in-parens': 'off',
+};
+
+const CODE_QUALITY_RULES = {
+	'semi': ['error', 'always'],
+	'eqeqeq': ['error', 'always'],
+	'curly': ['error', 'multi-line'],
+	'no-var': 'error',
+	'prefer-const': 'error',
+	'no-console': 'off',
+	'no-unused-vars': ['error', { argsIgnorePattern: '^_', varsIgnorePattern: '^_' }],
+};
+
+const DISABLED_STYLE_RULES = {
+	'multiline-comment-style': 'off',
+	'computed-property-spacing': 'off',
+	'capitalized-comments': 'off',
+	'no-lonely-if': 'off',
+};
+
+const mainConfig = {
+	files: ['**/*.js', '**/*.js.twig'],
+	linterOptions: {
+		reportUnusedDisableDirectives: false,
+	},
+	languageOptions: {
+		ecmaVersion: 'latest',
+		sourceType: 'module',
+		globals: {
+			...browserGlobals,
+			...nodeGlobals,
+			...jqueryGlobals,
+		},
+	},
+	rules: {
+		...FORMATTING_RULES,
+		...CODE_QUALITY_RULES,
+		...DISABLED_STYLE_RULES,
+	},
+};
+
+export default [
+	{ ignores: IGNORED_FILES },
+	mainConfig,
+];