.eslintrc.js

module.exports = {
  plugins: [
    '@typescript-eslint',
    'prettier',
    'eslint-comments',
    'jest',
    'promise',
    'unicorn',
    'simple-import-sort',
  ],
  extends: [
    'airbnb-base',
    'airbnb-typescript/base',
    'plugin:@typescript-eslint/recommended',
    'plugin:@typescript-eslint/recommended-requiring-type-checking',
    'plugin:eslint-comments/recommended',
    'plugin:jest/recommended',
    'plugin:promise/recommended',
    'plugin:unicorn/recommended',
    'prettier',
  ],
  env: {
    node: true,
    browser: true,
    jest: true,
  },
  parser: '@typescript-eslint/parser',
  parserOptions: {
    project: ['./tsconfig.json'],
  },
  rules: {
    'class-methods-use-this': 'off',
    'unicorn/prefer-module': 'off',
    // 'import/export': 'off',
    'unicorn/prefer-top-level-await': 'off',
    'eslint-comments/disable-enable-pair': ['error', { allowWholeFile: true }],
    'no-restricted-syntax': ['error', "BinaryExpression[operator='in']"],
    // Too restrictive, writing ugly code to defend against a very unlikely scenario: https://eslint.org/docs/rules/no-prototype-builtins
    'no-prototype-builtins': 'off',
    // https://basarat.gitbooks.io/typescript/docs/tips/defaultIsBad.html
    'import/prefer-default-export': 'off',
    'import/no-default-export': 'error',
    // Use function hoisting to improve code readability
    'no-use-before-define': [
      'error',
      { functions: false, classes: true, variables: true },
    ],
    // Allow most functions to rely on type inference. If the function is exported, then `@typescript-eslint/explicit-module-boundary-types` will ensure it's typed.
    '@typescript-eslint/explicit-function-return-type': 'off',
    '@typescript-eslint/no-use-before-define': [
      'error',
      { functions: false, classes: true, variables: true, typedefs: true },
    ],
    // Common abbreviations are known and readable
    'unicorn/prevent-abbreviations': 'off',
    // Airbnb prefers forEach
    'unicorn/no-array-for-each': 'off',
    // It's not accurate in the monorepo style
    'import/no-extraneous-dependencies': 'off',
  },
  overrides: [
    {
      files: ['*.js'],
      rules: {
        // Allow CJS until ESM support improves
        '@typescript-eslint/no-var-requires': 'off',
        'unicorn/prefer-module': 'off',
      },
    },
  ],
};