recommended.js

module.exports = {
  parser: '@typescript-eslint/parser',
  parserOptions: {
    sourceType: 'module',
  },
  extends: [
    'eslint:recommended',
    'plugin:@typescript-eslint/eslint-recommended',
    'plugin:@typescript-eslint/recommended',
    'plugin:import/recommended',
    'plugin:import/typescript',
  ],
  plugins: ['@typescript-eslint'],
  rules: {
    '@typescript-eslint/no-empty-function': [
      'error',
      {
        allow: ['private-constructors'],
      },
    ],
    '@typescript-eslint/quotes': [
      'error',
      'single',
      {
        avoidEscape: true,
      },
    ],
    '@typescript-eslint/restrict-plus-operands': 'error',
    '@typescript-eslint/semi': ['error', 'always'],
    'comma-dangle': [
      'error',
      {
        objects: 'always-multiline',
        arrays: 'always-multiline',
        functions: 'only-multiline',
      },
    ],
    'eol-last': 'error',
    eqeqeq: ['error', 'smart'],
    indent: [
      'error',
      2,
      {
        SwitchCase: 1,
      },
    ],
    'import/order': [
      'error',
      {
        groups: ['builtin', 'external', 'internal', 'parent', 'sibling', 'index'],
        'newlines-between': 'always',
        alphabetize: {
          order: 'asc',
        },
      },
    ],
    'max-len': [
      'error',
      {
        code: 120,
      },
    ],
    'no-trailing-spaces': 'error',
    'no-var': 'error',
    'space-before-function-paren': 'off',
    '@typescript-eslint/space-before-function-paren': [
      'error',
      {
        anonymous: 'always',
        named: 'never',
        asyncArrow: 'always',
      },
    ],
    '@typescript-eslint/explicit-function-return-type': 'off',
  },
  overrides: [
    {
      parser: '@typescript-eslint/parser',
      parserOptions: {
        ecmaVersion: 2018,
        sourceType: 'module',
      },
      files: ['**/*.ts?(x)'],
      rules: {
        '@typescript-eslint/explicit-function-return-type': 'error',
      },
    },
  ],
};