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'
        });
      }
    };
  }
};

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