.eslintrc.js

module.exports = {
  root: true,
  env: {
    node: true,
    es2018: true,
    commonjs: true,
  },
  plugins: ['node', 'prettier'],
  extends: ['eslint:recommended', 'plugin:node/recommended'],
  rules: {
    'node/no-unpublished-import': 0,
    'node/no-unpublished-require': 0,
    'prettier/prettier': ['error', { singleQuote: true }],
    'block-scoped-var': 'error',
    eqeqeq: 'error',
    'no-var': 'error',
    'prefer-const': 'error',
    'eol-last': 'error',
    'prefer-arrow-callback': 'error',
    'no-trailing-spaces': 'error',
    quotes: ['warn', 'single', { avoidEscape: true }],
    'no-restricted-properties': [
      'error',
      {
        object: 'describe',
        property: 'only',
      },
      {
        object: 'it',
        property: 'only',
      },
    ],
    'no-console': ['warn'],
    'object-shorthand': ['error', 'always'],
    'no-empty': 'warn',
  },
  overrides: [
    {
      files: ['**/*.ts'],
      parser: '@typescript-eslint/parser',
      extends: ['plugin:@typescript-eslint/recommended'],
      rules: {
        '@typescript-eslint/no-non-null-assertion': 'off',
        '@typescript-eslint/no-use-before-define': 'off',
        '@typescript-eslint/no-warning-comments': 'off',
        '@typescript-eslint/no-empty-function': 'off',
        '@typescript-eslint/no-var-requires': 'off',
        '@typescript-eslint/explicit-function-return-type': 'off',
        '@typescript-eslint/explicit-module-boundary-types': 'off',
        '@typescript-eslint/ban-types': 'off',
        '@typescript-eslint/camelcase': 'off',
        'node/no-missing-import': 'off',
        'node/no-empty-function': 'off',
        'node/no-unsupported-features/es-syntax': 'off',
        'node/no-missing-require': 'off',
        'node/shebang': 'off',
        'no-dupe-class-members': 'off',
        'require-atomic-updates': 'off',
        'prettier/prettier': ['error', { singleQuote: true }],
        quotes: ['warn', 'single', { avoidEscape: true }],
      },
      parserOptions: {
        ecmaVersion: 2018,
        sourceType: 'module',
      },
    },
  ],
};