refactor: Move vitest-config and eslint-config packages to @n8n (#13530)

packages/@n8n/eslint-config/shared.js

@@ -0,0 +1,41 @@
+/**
+ * @type {(dir: string, mode: 'frontend' | undefined) => import('@types/eslint').ESLint.ConfigData}
+ */
+module.exports = (tsconfigRootDir, mode) => {
+	const isFrontend = mode === 'frontend';
+	const parser = isFrontend ? 'vue-eslint-parser' : '@typescript-eslint/parser';
+	const extraParserOptions = isFrontend
+		? {
+				extraFileExtensions: ['.vue'],
+				parser: {
+					ts: '@typescript-eslint/parser',
+					js: '@typescript-eslint/parser',
+					vue: 'vue-eslint-parser',
+					template: 'vue-eslint-parser',
+				},
+			}
+		: {};
+
+	const settings = {
+		'import/parsers': {
+			'@typescript-eslint/parser': ['.ts'],
+		},
+
+		'import/resolver': {
+			typescript: {
+				tsconfigRootDir,
+				project: './tsconfig.json',
+			},
+		},
+	};
+
+	return {
+		parser,
+		parserOptions: {
+			tsconfigRootDir,
+			project: ['./tsconfig.json'],
+			...extraParserOptions,
+		},
+		settings,
+	};
+};