feat: add eslint flat config

__tests__/categories/js/eslint/eslint-test.utils.ts

@@ -2,10 +2,12 @@ import { Config } from 'src/categories/js/eslint/config/config.interface';
 
 export const createConfig = ({
   dependencies = [],
+  imports = [],
+  configs = [],
   eslintConfig = {},
-  ignore = [],
+  typescript = false,
   scripts = [],
   mutations = [],
 }: Partial<Config> = {}) => {
-  return { dependencies, eslintConfig, ignore, scripts, mutations };
+  return { dependencies, imports, configs, eslintConfig, typescript, scripts, mutations };
 };

__tests__/categories/js/eslint/eslint.entrypoint.test.ts

@@ -52,22 +52,130 @@ describe('eslint', () => {
     expect(npmMocked.installDevelopmentDependencies).toHaveBeenCalledWith('eslint', ...config.dependencies);
   });
 
-  test('should add .eslintrc.json to root', async () => {
-    const config = createConfig({ eslintConfig: { extends: ['__test__'] } });
+  test('should add eslint.config.mjs to root', async () => {
+    const config = createConfig({ eslintConfig: { ignores: ['__test__'] } });
     configMocked.getConfig.mockReturnValueOnce(config);
 
+    const configFile = `export default [
+  {
+    ignores: [
+      '__test__'
+    ],
+  }
+];`;
+
+    await eslint();
+
+    expect(fsMocked.addFileToRoot).toHaveBeenCalledWith('eslint.config.mjs', configFile);
+  });
+
+  test('should handle empty eslintConfig gracefully', async () => {
+    const config = createConfig({ eslintConfig: {} });
+    configMocked.getConfig.mockReturnValueOnce(config);
+
+    const configFile = `export default [
+  {\n
+  }
+];`;
+
     await eslint();
 
-    expect(fsMocked.addJsonFileToRoot).toHaveBeenCalledWith('.eslintrc.json', config.eslintConfig);
+    expect(fsMocked.addFileToRoot).toHaveBeenCalledWith('eslint.config.mjs', configFile);
   });
 
-  test('should add .eslintignore to root', async () => {
-    const config = createConfig({ ignore: ['node_modules', 'dist'] });
+  test('should handle empty parserOptions correctly', async () => {
+    const config = createConfig({
+      eslintConfig: {
+        languageOptions: {
+          parserOptions: undefined,
+        },
+      },
+    });
     configMocked.getConfig.mockReturnValueOnce(config);
 
+    const configFile = `export default [
+  {
+    languageOptions: {
+      globals: {\n
+      }
+    },
+  }
+];`;
+
+    await eslint();
+
+    expect(fsMocked.addFileToRoot).toHaveBeenCalledWith('eslint.config.mjs', configFile);
+  });
+
+  test('should handle configs mapping correctly', async () => {
+    const config = createConfig({
+      configs: ['__test1__', '__test2__'],
+    });
+    configMocked.getConfig.mockReturnValueOnce(config);
+
+    const configFile = `export default [
+  __test1__,
+  __test2__,
+  {\n
+  }
+];`;
+
+    await eslint();
+
+    expect(fsMocked.addFileToRoot).toHaveBeenCalledWith('eslint.config.mjs', configFile);
+  });
+
+  test('should handle complex eslintConfig correctly', async () => {
+    const config = createConfig({
+      typescript: true,
+      imports: ['import globals from "globals";'],
+      eslintConfig: {
+        files: ['src/**/*.ts'],
+        ignores: ['node_modules'],
+        languageOptions: {
+          globals: ['window'],
+          parserOptions: {
+            ecmaVersion: 2020,
+          },
+        },
+        plugins: {
+          '@typescript-eslint': 'eslintPluginTs',
+        },
+        rules: {
+          'no-console': 'warn',
+        },
+      },
+    });
+    configMocked.getConfig.mockReturnValueOnce(config);
+
+    const configFile = `// @ts-check
+import globals from "globals";\n
+export default tseslint.config(
+  {
+    files: ['src/**/*.ts'],
+    ignores: [
+      'node_modules'
+    ],
+    languageOptions: {
+      globals: {
+        ...globals.window
+      },
+      parserOptions: {
+        ecmaVersion: 2020
+      }
+    },
+    plugins: { 
+      '@typescript-eslint': eslintPluginTs
+    },
+    rules: {
+      'no-console': 'warn'
+    },
+  }
+);`;
+
     await eslint();
 
-    expect(fsMocked.addFileToRoot).toHaveBeenCalledWith('.eslintignore', 'node_modules\ndist');
+    expect(fsMocked.addFileToRoot).toHaveBeenCalledWith('eslint.config.mjs', configFile);
   });
 
   test('should add npm script to package.json', async () => {

__tests__/categories/js/eslint/eslint.utils.test.ts

@@ -33,7 +33,8 @@ describe('prettierMutation', () => {
 
     const expected = createConfig({
       dependencies: ['eslint-plugin-prettier', 'eslint-config-prettier'],
-      eslintConfig: { extends: ['plugin:prettier/recommended'] },
+      imports: [`import eslintPluginPrettierRecommended from 'eslint-plugin-prettier/recommended'`],
+      configs: ['eslintPluginPrettierRecommended'],
     });
 
     expect(actual).toEqual(expected);
@@ -44,14 +45,16 @@ describe('prettierMutation', () => {
 
     const actual = createConfig({
       dependencies: ['__test__'],
-      eslintConfig: { extends: ['__test__'] },
+      imports: ['__test__'],
+      configs: ['__test__'],
     });
 
     await prettierMutation(actual);
 
     const expected = createConfig({
       dependencies: ['__test__', 'eslint-plugin-prettier', 'eslint-config-prettier'],
-      eslintConfig: { extends: ['__test__', 'plugin:prettier/recommended'] },
+      imports: ['__test__', `import eslintPluginPrettierRecommended from 'eslint-plugin-prettier/recommended'`],
+      configs: ['__test__', 'eslintPluginPrettierRecommended'],
     });
 
     expect(actual).toEqual(expected);
@@ -60,8 +63,8 @@ describe('prettierMutation', () => {
 
 describe('jestMutation', () => {
   test('should add jest env if jest installed', async () => {
-    const actual = createConfig({ eslintConfig: { env: {} } });
-    const expected = createConfig({ eslintConfig: { env: { jest: true } } });
+    const actual = createConfig({ eslintConfig: { languageOptions: { globals: [] } } });
+    const expected = createConfig({ eslintConfig: { languageOptions: { globals: ['jest'] } } });
 
     jestUtilsMocked.isJestInstalled.mockResolvedValue(true);
 
@@ -72,7 +75,7 @@ describe('jestMutation', () => {
 
   test('should add jest env object if not exists', async () => {
     const actual = createConfig();
-    const expected = createConfig({ eslintConfig: { env: { jest: true } } });
+    const expected = createConfig({ eslintConfig: { languageOptions: { globals: ['jest'] } } });
 
     jestUtilsMocked.isJestInstalled.mockResolvedValueOnce(true);
 
@@ -94,7 +97,7 @@ describe('jestMutation', () => {
 });
 
 describe('isEslintInstalled', () => {
-  test('should call isInstalledAndInRootCheck with eslint and .eslintrc.json', () => {
-    expect(installedMocked.isInstalledAndInRootCheck).toHaveBeenCalledWith('eslint', '.eslintrc.json');
+  test('should call isInstalledAndInRootCheck with eslint and eslint.config.mjs', () => {
+    expect(installedMocked.isInstalledAndInRootCheck).toHaveBeenCalledWith('eslint', 'eslint.config.mjs');
   });
 });

eslint.config.mjs

@@ -0,0 +1,49 @@
+// @ts-check
+import globals from 'globals';
+import eslint from '@eslint/js';
+import tsPlugin from '@typescript-eslint/eslint-plugin';
+import beautifulSort from 'eslint-plugin-beautiful-sort';
+import eslintPluginPrettierRecommended from 'eslint-plugin-prettier/recommended';
+import tseslint from 'typescript-eslint';
+
+export default tseslint.config(
+  eslint.configs.recommended,
+  ...tseslint.configs.recommended,
+  eslintPluginPrettierRecommended,
+  {
+    files: ['**/*.ts'],
+    ignores: ['node_modules', 'dist', 'bin'],
+    languageOptions: {
+      globals: {
+        ...globals.node,
+        ...globals.jest,
+      },
+      parserOptions: {
+        project: true,
+      },
+    },
+    plugins: {
+      '@typescript-eslint': tsPlugin,
+      'beautiful-sort': beautifulSort,
+    },
+    rules: {
+      'no-use-before-define': 'error',
+      'object-shorthand': 'warn',
+      'no-async-promise-executor': 'warn',
+      '@typescript-eslint/consistent-type-definitions': ['error', 'type'],
+      '@typescript-eslint/interface-name-prefix': 'off',
+      '@typescript-eslint/explicit-function-return-type': 'off',
+      '@typescript-eslint/explicit-module-boundary-types': 'off',
+      '@typescript-eslint/no-explicit-any': 'warn',
+      '@typescript-eslint/no-misused-promises': 'warn',
+      '@typescript-eslint/no-deprecated': 'error',
+      'beautiful-sort/import': [
+        'error',
+        {
+          special: [],
+          order: ['special', 'namespace', 'default', 'defaultObj', 'obj', 'none'],
+        },
+      ],
+    },
+  },
+);