@dr.pogodin/eslint-configs/config/typescript.js

ESLint configurations for TypeScript and/or React projects

import tsEsLint from 'typescript-eslint';

import jsConfig from './javascript.js';

export default tsEsLint.config(
  {
    name: 'dr.pogodin/typescript',

    extends: [
      jsConfig,
      tsEsLint.configs.recommendedTypeChecked,
      tsEsLint.configs.stylisticTypeChecked,
    ],
    files: ['**/*.ts', '**/*.tsx'],
    languageOptions: {
      parserOptions: {
        projectService: true,
      },
    },
    rules: {
      // TypeScript takes care of the same, in a better way.
      '@babel/new-cap': 'off',
      '@babel/no-undef': 'off',

      // It does not support type imports, and TypeScript itself does necessary
      // checks for imports anyway.
      'import/named': 'off',

      '@typescript-eslint/array-type': ['error', {
        default: 'array-simple',
      }],
      '@typescript-eslint/class-methods-use-this': 'error',
      '@typescript-eslint/consistent-return': 'error',
      '@typescript-eslint/consistent-type-definitions': ['error', 'type'],
      '@typescript-eslint/consistent-type-exports': 'error',
      '@typescript-eslint/consistent-type-imports': 'error',
      '@typescript-eslint/default-param-last': 'error',
      '@typescript-eslint/explicit-module-boundary-types': 'error',
      '@typescript-eslint/no-confusing-void-expression': 'error',
      '@typescript-eslint/no-deprecated': 'warn',
      '@typescript-eslint/no-dupe-class-members': 'error',
      '@typescript-eslint/no-empty-interface': 'error',
      '@typescript-eslint/no-extraneous-class': 'error',
      '@typescript-eslint/no-import-type-side-effects': 'error',
      '@typescript-eslint/no-inferrable-types': 'off',
      '@typescript-eslint/no-invalid-this': 'error',
      '@typescript-eslint/no-invalid-void-type': 'error',
      '@typescript-eslint/no-loop-func': 'error',
      '@typescript-eslint/no-loss-of-precision': 'error',
      '@typescript-eslint/no-meaningless-void-operator': 'error',
      '@typescript-eslint/no-misused-spread': 'error',
      '@typescript-eslint/no-mixed-enums': 'error',
      '@typescript-eslint/no-non-null-asserted-nullish-coalescing': 'error',
      '@typescript-eslint/no-redeclare': 'error',
      '@typescript-eslint/no-unnecessary-type-conversion': 'error',

      // NOTE: The core rule variant reports incorrect errors on TypeScript
      // code, thus disabled.
      '@typescript-eslint/no-shadow': 'error',
      'no-shadow': 'off',

      '@typescript-eslint/no-unnecessary-boolean-literal-compare': 'error',
      '@typescript-eslint/no-unnecessary-condition': 'error',
      '@typescript-eslint/no-unnecessary-parameter-property-assignment': 'error',
      '@typescript-eslint/no-unnecessary-qualifier': 'error',
      '@typescript-eslint/no-unnecessary-template-expression': 'error',
      '@typescript-eslint/no-unnecessary-type-arguments': 'error',
      '@typescript-eslint/no-use-before-define': 'error',
      '@typescript-eslint/no-useless-constructor': 'error',
      '@typescript-eslint/no-useless-empty-export': 'error',
      '@typescript-eslint/parameter-properties': ['error', {
        prefer: 'parameter-property',
      }],

      // NOTE: The core variant of this rule, disabled below, does not work
      // correctly for TypeScript code in some edge cases.
      '@typescript-eslint/prefer-destructuring': 'error',
      'prefer-destructuring': 'off',

      '@typescript-eslint/prefer-enum-initializers': 'error',
      '@typescript-eslint/prefer-literal-enum-member': 'error',
      '@typescript-eslint/prefer-reduce-type-parameter': 'error',
      '@typescript-eslint/prefer-regexp-exec': 'off',
      '@typescript-eslint/prefer-return-this-type': 'error',
      '@typescript-eslint/promise-function-async': 'error',
      '@typescript-eslint/related-getter-setter-pairs': 'error',
      '@typescript-eslint/require-array-sort-compare': 'error',
      '@typescript-eslint/switch-exhaustiveness-check': 'error',
      '@typescript-eslint/typedef': 'error',
      '@typescript-eslint/unified-signatures': 'error',
      '@typescript-eslint/use-unknown-in-catch-callback-variable': 'error',
    },
  },
);