@typescript-eslint/types

What is @typescript-eslint/types?

The @typescript-eslint/types package is part of the TypeScript-ESLint project, which provides a TypeScript parser for ESLint and utilities for working with TypeScript and ESLint together. This specific package contains TypeScript definitions for ESLint-specific types, making it easier to work with ESLint configurations, rules, and plugins in a TypeScript environment. It is primarily used by developers who are creating custom ESLint rules or configurations and want to leverage TypeScript's type-checking capabilities for better development experience.

What are @typescript-eslint/types's main functionalities?

AST Node Types

Provides TypeScript interfaces for AST nodes generated by the parser. This is useful for writing type-safe code that inspects or manipulates the AST, such as custom ESLint rules.

import { TSESTree } from '@typescript-eslint/types';

function processNode(node: TSESTree.Node) {
  if (node.type === 'Identifier') {
    console.log('Found an identifier:', node.name);
  }
}

Rule Definition Helpers

Includes types for defining ESLint rules in a TypeScript-friendly way, making it easier to create custom rules with type safety.

import { TSESLint } from '@typescript-eslint/types';

const myRule: TSESLint.RuleModule<'my-error', []> = {
  meta: {
    type: 'problem',
    docs: {
      description: 'My custom rule',
      recommended: 'error'
    }
  },
  create(context) {
    return {
      Identifier(node) {
        context.report({
          node,
          messageId: 'my-error'
        });
      }
    };
  }
};

Other packages similar to @typescript-eslint/types

@typescript-eslint/experimental-utils

This package provides a set of utilities for working with TypeScript and ESLint, including ESLint rule helpers and AST utilities. It is similar to @typescript-eslint/types but offers a broader range of tools for rule development and AST manipulation.

eslint-plugin-typescript

An older package that aimed to add TypeScript support to ESLint before the official @typescript-eslint project was established. It provides some similar functionalities but is now deprecated in favor of the more comprehensive and up-to-date @typescript-eslint suite of packages.

README

@typescript-eslint/types

Types for the TypeScript-ESTree AST spec

This package exists to help us reduce cycles and provide lighter-weight packages at runtime.

✋ Internal Package

This is an internal package to the typescript-eslint monorepo. You likely don't want to use it directly.

👉 See https://typescript-eslint.io for docs on typescript-eslint.

Changelog

5.59.0 (2023-04-17)

Bug Fixes

• eslint-plugin: [no-unnecessary-condition] allow nullish coalescing for naked type parameter (#6910) (3e5f858)

Features

• eslint-plugin: [ban-types] add NonNullable suggestion and allow custom suggestions (#6876) (ff65235)