.eslintrc.cjs

/** @type {import('eslint').Linter.Config} */
const config = {
  root: true,
  parser: '@typescript-eslint/parser',
  plugins: ['@typescript-eslint', 'unicorn', 'import'],
  extends: ['eslint:recommended'],
  env: {
    node: true,
    es6: true,
  },
  parserOptions: {
    ecmaVersion: 2020,
    sourceType: 'module',
  },
  rules: {
    quotes: ['error', 'single', { avoidEscape: true }],
    camelcase: ['error', { properties: 'never' }],
    semi: ['error', 'never'],
    indent: [2, 2],
    eqeqeq: ['error', 'always'],

    'prefer-const': 'error',
    'no-multiple-empty-lines': [2, { max: 1, maxEOF: 1 }],
    'array-bracket-spacing': ['error', 'never'],
    'brace-style': ['error', '1tbs', { allowSingleLine: true }],
    'comma-spacing': ['error', { before: false, after: true }],
    'no-lonely-if': 'error',
    'dot-notation': 'error',
    'no-else-return': 'error',
    'no-tabs': 'error',
    'no-trailing-spaces': [
      'error',
      {
        skipBlankLines: false,
        ignoreComments: false,
      },
    ],
    'no-var': 'error',
    'unicode-bom': ['error', 'never'],
    curly: ['error', 'all'],
    'object-curly-spacing': ['error', 'always'],
    'keyword-spacing': ['error'],
    'require-atomic-updates': 0,
    'linebreak-style': ['error', 'unix'],
    'unicorn/prefer-node-protocol': ['error'],
    'import/extensions': ['error', 'ignorePackages'],
    'no-restricted-syntax': [
      'error',
      'IfStatement > ExpressionStatement > AssignmentExpression',
    ],
    'unicorn/prefer-ternary': 'error',
  },
  overrides: [
    {
      files: ['*.ts'],
      rules: {
        // see https://stackoverflow.com/questions/55280555/typescript-eslint-eslint-plugin-error-route-is-defined-but-never-used-no-un
        'no-unused-vars': 'off',
        '@typescript-eslint/no-unused-vars': 'error',
        '@typescript-eslint/consistent-type-imports': 'error',
        'no-undef': 'off',
        // allow overloads
        'no-redeclare': 'off',
      },
    },
    {
      files: ['*.test.ts'],
      rules: {
        'dot-notation': 'off',
      },
    },
  ],
}

module.exports = config