.eslintrc.js

module.exports = {
  root: true,
  env: {
    browser: true,
    es2020: true,
    node: true,
    jest: true,
  },
  extends: [
    'eslint:recommended',
    'plugin:@typescript-eslint/eslint-recommended',
    'plugin:@typescript-eslint/recommended',
  ],
  ignorePatterns: ['lib'],
  parser: '@typescript-eslint/parser',
  parserOptions: {
    project: 'tsconfig.json',
    sourceType: 'module',
  },
  plugins: ['@typescript-eslint'],
  rules: {
    '@typescript-eslint/indent': [
      'error',
      2,
      {
        MemberExpression: 1,
        ignoredNodes: [
          'FunctionExpression > .params[decorators.length > 0]',
          'FunctionExpression > .params > :matches(Decorator, :not(:first-child))',
          'ClassBody.body > PropertyDefinition[decorators.length > 0] > .key',
        ],
      },
    ],
    '@typescript-eslint/consistent-type-imports': 'error',
    '@typescript-eslint/no-duplicate-imports': 'error',
    '@typescript-eslint/prefer-optional-chain': 'error',
    '@typescript-eslint/no-explicit-any': 'off',
    '@typescript-eslint/explicit-function-return-type': 'off',
    '@typescript-eslint/no-non-null-assertion': 'off',
    '@typescript-eslint/ban-ts-comment': 'off',
    '@typescript-eslint/no-unused-vars': 'off',
    '@typescript-eslint/naming-convention': [
      'error',
      { selector: 'default', format: null },
      {
        selector: 'variable',
        format: ['camelCase', 'PascalCase', 'UPPER_CASE'],
      },
      { selector: 'typeLike', format: ['PascalCase'] },
    ],
    '@typescript-eslint/explicit-module-boundary-types': 'off',
    '@typescript-eslint/no-empty-interface': 'off',
    '@typescript-eslint/adjacent-overload-signatures': 'error',
    '@typescript-eslint/consistent-type-assertions': 'error',
    '@typescript-eslint/no-array-constructor': 'error',
    '@typescript-eslint/no-empty-function': [
      'error',
      { allow: ['private-constructors', 'protected-constructors'] },
    ],
    '@typescript-eslint/no-inferrable-types': 'off',
    '@typescript-eslint/no-misused-new': 'error',
    '@typescript-eslint/no-namespace': 'error',
    '@typescript-eslint/no-this-alias': 'error',
    '@typescript-eslint/no-var-requires': 'error',
    '@typescript-eslint/triple-slash-reference': 'error',
    '@typescript-eslint/type-annotation-spacing': 'error',
    '@typescript-eslint/array-type': 'error',
    '@typescript-eslint/no-unnecessary-qualifier': 'error',
    '@typescript-eslint/no-unnecessary-type-arguments': 'off', // disabled as it started to be buggy
    '@typescript-eslint/quotes': [
      'error',
      'single',
      { avoidEscape: true, allowTemplateLiterals: true },
    ],
    '@typescript-eslint/semi': ['error', 'always'],
    '@typescript-eslint/no-useless-constructor': 'error',
    '@typescript-eslint/no-redeclare': ['error'],
    '@typescript-eslint/member-delimiter-style': [
      'error',
      {
        multiline: { delimiter: 'semi', requireLast: true },
        singleline: { delimiter: 'semi', requireLast: false },
      },
    ],
    '@typescript-eslint/space-before-function-paren': [
      'error',
      {
        anonymous: 'always',
        named: 'never',
        asyncArrow: 'always',
      },
    ],
    'arrow-parens': ['error', 'as-needed'],
    'no-var': 'error',
    'prefer-const': 'error',
    'prefer-rest-params': 'error',
    'prefer-spread': 'error',
    'constructor-super': 'error',
    'for-direction': 'error',
    'getter-return': 'error',
    'no-async-promise-executor': 'error',
    'no-case-declarations': 'error',
    'no-class-assign': 'error',
    'no-compare-neg-zero': 'error',
    'no-cond-assign': 'error',
    'no-const-assign': 'error',
    'no-constant-condition': 'error',
    'no-control-regex': 'error',
    'no-debugger': 'error',
    'no-delete-var': 'error',
    'no-dupe-args': 'error',
    'no-dupe-keys': 'error',
    'no-duplicate-case': 'error',
    'no-empty': 'error',
    'no-empty-character-class': 'error',
    'no-empty-pattern': 'error',
    'no-ex-assign': 'error',
    'no-extra-boolean-cast': 'error',
    'no-extra-semi': 'error',
    'no-fallthrough': 'error',
    'no-func-assign': 'error',
    'no-global-assign': 'error',
    'no-inner-declarations': 'error',
    'no-invalid-regexp': 'error',
    'no-irregular-whitespace': 'error',
    'no-misleading-character-class': 'error',
    'no-mixed-spaces-and-tabs': 'error',
    'no-new-symbol': 'error',
    'no-obj-calls': 'error',
    'no-octal': 'error',
    'no-prototype-builtins': 'error',
    'no-redeclare': 'off',
    'no-regex-spaces': 'error',
    'no-self-assign': 'error',
    'no-shadow-restricted-names': 'error',
    'no-sparse-arrays': 'error',
    'no-this-before-super': 'error',
    'no-undef': 'error',
    'no-unexpected-multiline': 'error',
    'no-unreachable': 'error',
    'no-unsafe-finally': 'error',
    'no-unsafe-negation': 'error',
    'no-unused-labels': 'error',
    'no-useless-catch': 'error',
    'no-useless-escape': 'error',
    'no-with': 'error',
    'require-yield': 'error',
    'use-isnan': 'error',
    'valid-typeof': 'error',
    'comma-dangle': ['error', 'always-multiline'],
    'dot-notation': 'error',
    'eol-last': 'error',
    eqeqeq: ['error', 'always', { null: 'ignore' }],
    'no-console': 'error',
    'no-duplicate-imports': 'off',
    'no-multiple-empty-lines': 'error',
    'no-throw-literal': 'error',
    'no-trailing-spaces': 'error',
    'no-undef-init': 'error',
    'object-shorthand': 'error',
    'quote-props': ['error', 'consistent-as-needed'],
    'spaced-comment': 'error',
    yoda: 'error',
    curly: 'error',
    'object-curly-spacing': ['error', 'always'],
    'lines-between-class-members': [
      'error',
      'always',
      { exceptAfterSingleLine: true },
    ],
    'padded-blocks': ['error', { classes: 'always' }],
    'no-else-return': 'error',
    'block-spacing': ['error', 'always'],
    'space-before-blocks': ['error', 'always'],
    'brace-style': ['error', '1tbs', { allowSingleLine: true }],
    'keyword-spacing': ['error', { before: true, after: true }],
    'space-in-parens': ['error', 'never'],
    indent: 'off',
  },
};