.eslintrc.js

module.exports = {
  env: {
    es2021: true,
    node: true,
  },
  extends: ['eslint:recommended', 'plugin:@typescript-eslint/recommended'],
  overrides: [
    {
      env: {
        node: true,
      },
      files: ['.eslintrc.{js,cjs}'],
      parserOptions: {
        sourceType: 'script',
      },
    },
  ],
  parser: '@typescript-eslint/parser',
  parserOptions: {
    ecmaVersion: 'latest',
    sourceType: 'module',
  },
  plugins: ['@typescript-eslint'],
  rules: {
    'array-callback-return': 'error',
    'arrow-spacing': [
      'error',
      {
        before: true,
        after: true,
      },
    ],
    camelcase: 'error',
    'comma-dangle': [
      'error',
      {
        arrays: 'always-multiline',
        objects: 'always-multiline',
        imports: 'always-multiline',
        exports: 'always-multiline',
        functions: 'never',
      },
    ],
    curly: ['error', 'multi-line'],
    'dot-location': ['error', 'property'],
    'dot-notation': 'error',
    'eol-last': ['error', 'always'],
    eqeqeq: 'warn',
    'key-spacing': 'error',
    indent: [
      'error',
      2,
      {
        SwitchCase: 1,
      },
    ],
    'linebreak-style': ['error', 'unix'],
    'max-len': [
      'warn',
      {
        code: 80,
        ignorePattern: '^import\\s.+\\sfrom\\s.+;$',
        ignoreUrls: true,
      },
    ],
    'newline-per-chained-call': 'error',
    'no-alert': 'warn',
    'no-await-in-loop': 'error',
    'no-case-declarations': 'error',
    'standard/no-callback-literal': 'off',
    'no-console': 'warn',
    'no-const-assign': 'error',
    'no-debugger': 'warn',
    'no-duplicate-imports': 'error',
    'no-else-return': 'error',
    'no-implicit-coercion': [
      'error',
      {
        allow: ['!!'],
      },
    ],
    'no-mixed-spaces-and-tabs': 'error',
    'no-multi-spaces': 'error',
    'no-new': 'off',
    'no-param-reassign': 'error',
    'no-return-await': 'error',
    'no-sequences': 'error',
    'no-trailing-spaces': 'error',
    'no-undef-init': 'error',
    'no-unreachable': 'warn',
    'no-unused-expressions': 'off',
    'no-use-before-define': 'off',
    'no-useless-return': 'warn',
    'no-var': 'error',
    'object-curly-spacing': [
      'error',
      'always',
      {
        arraysInObjects: true,
        objectsInObjects: true,
      },
    ],
    'object-shorthand': ['error', 'always'],
    'padding-line-between-statements': [
      'warn',
      {
        blankLine: 'always',
        prev: '*',
        next: 'return',
      },
      {
        blankLine: 'always',
        prev: '*',
        next: 'export',
      },
      {
        blankLine: 'any',
        prev: 'export',
        next: 'export',
      },
      {
        blankLine: 'always',
        prev: ['const', 'let'],
        next: '*',
      },
      {
        blankLine: 'always',
        prev: '*',
        next: ['const', 'let'],
      },
      {
        blankLine: 'any',
        prev: ['const', 'let'],
        next: ['const', 'let'],
      },
      {
        blankLine: 'always',
        prev: '*',
        next: 'block-like',
      },
      {
        blankLine: 'always',
        prev: 'block-like',
        next: '*',
      },
      {
        blankLine: 'always',
        prev: '*',
        next: 'class',
      },
      {
        blankLine: 'always',
        prev: 'import',
        next: '*',
      },
      {
        blankLine: 'any',
        prev: 'import',
        next: 'import',
      },
    ],
    'prefer-const': 'error',
    'prefer-promise-reject-errors': 'warn',
    quotes: [
      'error',
      'single',
      {
        avoidEscape: true,
      },
    ],
    semi: ['error', 'always'],
    'space-before-function-paren': [
      'error',
      {
        anonymous: 'always',
        named: 'never',
        asyncArrow: 'always',
      },
    ],
    yoda: 'error',

    // TypeScript rules
    '@typescript-eslint/no-unused-vars': 'error',
    '@typescript-eslint/no-explicit-any': 'error',
  },
};