eslint.config.mjs

import eslint from '@eslint/js';
import stylistic from '@stylistic/eslint-plugin';
import eslintPluginPrettierRecommended from 'eslint-plugin-prettier/recommended';
import eslintTs from 'typescript-eslint';

// export default eslintTs.config({
const defaultConfig = eslintTs.config({
    extends: [
        eslint.configs.recommended,
        ...eslintTs.configs.recommended,
        eslintPluginPrettierRecommended
    ],
    ignores: ['node_modules', 'dist', 'public', '.local', '**/assets/**'],
    plugins: {
        '@stylistic': stylistic
    },
    // no overrides in flat config
    // overrides: [
    //     {
    //         files: ['*spec.ts', '*spec.tsx'],
    //         plugins: ['jest'],
    //         extends: ['plugin:jest/recommended'],
    //         rules: {
    //             'jest/expect-expect': 'off'
    //         }
    //     }
    // ],
    rules: {
        'prettier/prettier': [
            'error',
            {
                tabWidth: 4,
                singleQuote: true,
                trailingComma: 'none',
                arrowParens: 'avoid',
                endOfLine: 'auto'
            },
            {
                overrides: [
                    {
                        files: '**/*.css',
                        options: {
                            tabWidth: 2
                        }
                    }
                ]
            }
        ],
        '@typescript-eslint/naming-convention': [
            'error',
            {
                selector: 'interface',
                format: ['PascalCase'],
                custom: {
                    regex: '^I[A-Z]',
                    match: true
                }
            }
        ],
        'no-unused-vars': 'off',
        '@typescript-eslint/no-unused-vars': [
            'error',
            {
                args: 'all',
                argsIgnorePattern: '^_',
                varsIgnorePattern: '^_',
                caughtErrorsIgnorePattern: '^_'
            }
        ],
        '@typescript-eslint/no-explicit-any': 'off',
        '@typescript-eslint/no-namespace': 'off',
        '@typescript-eslint/no-unused-expressions': 'off',
        '@typescript-eslint/no-use-before-define': 'off',
        '@stylistic/no-explicit-any': 'off',
        '@stylistic/no-trailing-spaces': 'off',
        '@stylistic/padded-blocks': 'off',
        '@stylistic/function-paren-newline': 'off',
        '@stylistic/no-use-before-define': 'off',
        '@stylistic/quotes': [
            'error',
            'single',
            {
                avoidEscape: true,
                allowTemplateLiterals: false
            }
        ],
        curly: ['error', 'all'],
        eqeqeq: 'error',
        'prefer-arrow-callback': 'error'
    }
});

export default [
    ...defaultConfig,
    // overrides
    ...defaultConfig.map(config => ({
        ...config,
        files: ['*spec.ts', '*spec.tsx'],
        plugins: ['jest'],
        extends: ['plugin:jest/recommended'],
        rules: {
            ...config.rules,
            'jest/expect-expect': 'off'
        }
    }))
];