.eslintrc.js

module.exports = {
  env: {
    node: true,
    es6: true,
  },
  plugins: [
    '@typescript-eslint',
    'unicorn',
    'jest',
    'eslint-plugin-tsdoc',
    'jsdoc',
  ],
  extends: [
    'eslint:recommended',
    'plugin:@typescript-eslint/recommended',
    'plugin:jsdoc/recommended',
    'plugin:unicorn/recommended',
  ],
  parser: '@typescript-eslint/parser',
  parserOptions: {
    ecmaVersion: 2020,
    sourceType: 'module',
  },
  rules: {
    // Vanilla ESLint
    'array-bracket-newline': ['error', { 'multiline': false, 'minItems': 3 }],
    'array-bracket-spacing': ['error', 'never'],
    'array-element-newline': ['error', { 'multiline': true, 'minItems': 3 }],
    'arrow-body-style': ['error', 'as-needed'],
    'arrow-parens': ['error', 'always'],
    'arrow-spacing': ['error'],
    'block-spacing': ['error'],
    'brace-style': 'off',
    'comma-dangle': 'off',
    'comma-spacing': 'off',
    'curly': ['error'],
    'eol-last': ['error', 'always'],
    'eqeqeq': 'error',
    'func-call-spacing': 'off',
    'function-call-argument-newline': ['error', 'consistent'],
    'function-paren-newline': ['error', 'multiline-arguments'],
    'indent': ['error', 2],
    'key-spacing': ['error', { 'beforeColon': false }],
    'keyword-spacing': 'off',
    'multiline-ternary': ['error', 'always'],
    'newline-per-chained-call': ['error', { 'ignoreChainWithDepth': 2 }],
    'no-trailing-spaces': 'error',
    'no-unneeded-ternary': 'error',
    'no-use-before-define': 'off',
    'no-var': 'error',
    'no-whitespace-before-property': 'error',
    'object-curly-spacing': 'off',
    'object-property-newline': ['error', { 'allowAllPropertiesOnSameLine': true }],
    'operator-linebreak': ['error', 'after'],
    'prefer-template': 'error',
    'quotes': 'off',
    'require-await': 'error',
    'semi': 'off',
    'space-before-blocks': 'error',
    'space-before-function-paren': 'off',
    'space-infix-ops': 'off',
    'spaced-comment': ['error', 'always'],
    'template-curly-spacing': 'error',
    'max-len': ['error',
      {
        'code': 120,
        'ignoreComments': true,
        'ignoreStrings': true,
        'ignoreTemplateLiterals': true,
        'ignoreRegExpLiterals': true,
      }],

    // Typescript
    '@typescript-eslint/array-type': ['error'],
    '@typescript-eslint/brace-style': ['error'],
    '@typescript-eslint/comma-dangle': ['error', 'always-multiline'],
    '@typescript-eslint/comma-spacing': ['error', { 'before': false, 'after': true }],
    '@typescript-eslint/explicit-function-return-type': ['error'],
    '@typescript-eslint/explicit-module-boundary-types': ['error'],
    '@typescript-eslint/func-call-spacing': ['error', 'never'],
    '@typescript-eslint/keyword-spacing': ['error', { 'before': true }],
    '@typescript-eslint/no-explicit-any': 'error',
    '@typescript-eslint/no-use-before-define': ['error', { 'functions': false, 'classes': true, 'variables': true }],
    '@typescript-eslint/object-curly-spacing': ['error', 'always'],
    '@typescript-eslint/quotes': ['error', 'single'],
    '@typescript-eslint/semi': ['error'],
    '@typescript-eslint/space-before-function-paren': ['error', 'never'],
    '@typescript-eslint/space-infix-ops': ['error'],
    '@typescript-eslint/type-annotation-spacing': ['error'],

    // JSDoc
    'jsdoc/require-description': ['error'],
    'jsdoc/require-param-type': 0,
    'jsdoc/require-returns': 0,
    'jsdoc/require-returns-type': 0,
    'jsdoc/match-description': ['error',
      {
        mainDescription: '[A-Z].*',
        tags:
                    {
                      param: {
                        message: 'The parameter description has to start with "The"',
                        match: 'The .*',
                      },
                    },
      }],

    // TSDoc
    'tsdoc/syntax': 'error',

    // Jest
    'jest/no-alias-methods': ['error'],
    'jest/prefer-called-with': ['error'],
    'jest/prefer-expect-resolves': ['error'],
    'jest/prefer-strict-equal': ['error'],
    'jest/prefer-to-contain': ['error'],
    'jest/prefer-to-have-length': ['error'],
    'jest/require-top-level-describe': ['error'],
    'jest/no-restricted-matchers': ['error',
      {
        'toBeTruthy': 'Avoid `toBeTruthy`',
        'toBeFalsy': 'Avoid `toBeFalsy`',
      }],

    // Unicorn
    'unicorn/no-process-exit': 0,
  },
};