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@typescript-eslint/utils

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    @typescript-eslint/utils

Utilities for working with TypeScript + ESLint together


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Package description

What is @typescript-eslint/utils?

The @typescript-eslint/utils package provides utility functions and types that are used across the TypeScript ESLint project. It's designed to help with the development of ESLint rules, parsers, and plugins by providing a consistent set of tools for working with TypeScript code. This package is particularly useful for those creating custom ESLint rules or integrating TypeScript more deeply into their ESLint configurations.

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

AST Utilities

AST Utilities provide functions to work with Abstract Syntax Tree (AST) nodes. These utilities can help in identifying node types, such as checking if a node is an identifier or a literal, which is useful when writing custom ESLint rules.

import { ASTUtils } from '@typescript-eslint/utils';
const { isIdentifier, isLiteral } = ASTUtils;

Type Checking

This feature allows rule developers to access TypeScript's type checker, enabling them to perform more sophisticated analyses, such as type inference or type checking, within their custom ESLint rules.

import { ESLintUtils } from '@typescript-eslint/utils';
const { getParserServices } = ESLintUtils;
const parserServices = getParserServices(context);
const checker = parserServices.program.getTypeChecker();

ESLint Rule Creation

Provides a utility for creating ESLint rules with a consistent structure and metadata. This is particularly useful for developers creating custom rules for projects that use TypeScript.

import { ESLintUtils } from '@typescript-eslint/utils';
const createRule = ESLintUtils.RuleCreator(name => `https://example.com/rule/${name}`);
const myRule = createRule({
  name: 'my-custom-rule',
  meta: { /* rule metadata */ },
  defaultOptions: [],
  create(context) { /* rule implementation */ }
});

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@typescript-eslint/utils

Utilities for working with TypeScript + ESLint together.

NPM Version NPM Downloads

👉 See https://typescript-eslint.io/packages/utils for documentation on this package.

See https://typescript-eslint.io for general documentation on typescript-eslint, the tooling that allows you to run ESLint and Prettier on TypeScript code.

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Last updated on 15 Apr 2024

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