.eslintrc.js

module.exports = {
  root: true,
  env: {
    es6: true,
    node: true,
  },
  parser: '@typescript-eslint/parser',
  plugins: [
    '@typescript-eslint',
    'simple-import-sort',
  ],
  extends: [
    'eslint:recommended',
    'plugin:@typescript-eslint/eslint-recommended',
    'plugin:@typescript-eslint/recommended',
  ],
  ignorePatterns: [
    '/lib/',
    '/out/',
  ],
  rules: {
    '@typescript-eslint/array-type': [
      'error',
      {default: 'array', readonly: 'generic'},
    ],
    '@typescript-eslint/consistent-type-assertions': [
      'error',
      {assertionStyle: 'as', objectLiteralTypeAssertions: 'never'},
    ],
    '@typescript-eslint/consistent-type-definitions': ['error', 'interface'],
    '@typescript-eslint/explicit-function-return-type': 'error',
    '@typescript-eslint/member-delimiter-style': 'error',
    '@typescript-eslint/no-explicit-any': 'off',
    '@typescript-eslint/no-misused-new': 'error',
    '@typescript-eslint/no-this-alias': 'error',
    '@typescript-eslint/no-unused-vars': 'error',
    '@typescript-eslint/no-useless-constructor': 'error',
    '@typescript-eslint/no-use-before-define': 'off',
    '@typescript-eslint/prefer-function-type': 'error',
    '@typescript-eslint/prefer-optional-chain': 'error',
    '@typescript-eslint/quotes': ['error', 'single'],
    '@typescript-eslint/semi': 'error',
    '@typescript-eslint/unified-signatures': 'error',
    'array-bracket-spacing': 'error',
    'arrow-parens': 'error',
    'consistent-return': 'error',
    'curly': 'error',
    'default-case-last': 'error',
    'default-param-last': 'error',
    'dot-location': ['error', 'property'],
    'dot-notation': 'error',
    'eqeqeq': ['error', 'smart'],
    'max-len': ['error', {ignoreUrls: true}],
    'no-alert': 'error',
    'no-caller': 'error',
    'no-constructor-return': 'error',
    'no-duplicate-imports': 'error',
    'no-else-return': 'error',
    'no-eq-null': 'error',
    'no-eval': 'error',
    'no-extra-bind': 'error',
    'no-extra-label': 'error',
    'no-implicit-globals': 'error',
    'no-implied-eval': 'error',
    'no-label-var': 'error',
    'no-loss-of-precision': 'error',
    'no-multi-spaces': 'error',
    'no-new-wrappers': 'error',
    'no-promise-executor-return': 'error',
    'no-restricted-globals': [
      // https://github.com/microsoft/TypeScript/issues/18433
      'error',
      'closed',
      'event',
      'fdescribe',
      'length',
      'location',
      'name',
      'parent',
      'top',
    ],
    'no-self-compare': 'error',
    'no-sequences': 'error',
    'no-throw-literal': 'error',
    'no-undef-init': 'error',
    'no-unused-expressions': 'error',
    'no-useless-call': 'error',
    'no-useless-computed-key': 'error',
    'no-useless-rename': 'error',
    'no-tabs': 'error',
    'no-trailing-spaces': 'error',
    'no-unneeded-ternary': ['error', {defaultAssignment: false}],
    'no-var': 'error',
    'no-whitespace-before-property': 'error',
    'object-curly-spacing': 'error',
    'object-shorthand': ['error', 'always', {avoidQuotes: true}],
    'prefer-const': 'error',
    'radix': 'error',
    'require-await': 'error',
    'simple-import-sort/imports': 'error',
  },
  overrides: [
    {
      files: ['**/test/**/*.ts'],
      rules: {
        '@typescript-eslint/explicit-function-return-type': 'off',
        '@typescript-eslint/no-non-null-assertion': 'off',
      },
    },
  ],
};