TypeScript icon, indicating that this package has built-in type declarations

0.3.1 • Public • Published

TypeScript types for new JavaScript

Note This requires TypeScript 5.0

This repository contains TypeScript type definitions for a lot of new JavaScript stuff that isn't yet in TypeScript's standard type definitions (see below for the complete list). These range from the File System Access API over View Transitions to Houdini CSS Typed OM or Handwriting Recognition. Some specifications have only partially been integrated into TypeScript's standard type declarations, in which case this repository contains only the parts of the specifications that aren't there (yet). For most specifications I have used WebIDL2TS, a tool that automatically converts WebIDL to TypeScript type definitions, and manually edited the stuff where it didn't generate the desired result.

Also take a look Better-TypeScript, which contains various TypeScript type definitions to make working with TypeScript more convenient.

NPM: new-javascript

GitHub: BenjaminAster/TypeScript-types-for-new-JavaScript

Install using npm:

npm i -D new-javscript@latest

Reference the type definitions directly in your TypeScript/JavaScript files...

/// <reference types="new-javascript" />

...or include them in your tsconfig.json or jsconfig.json:

	"compilerOptions": {
		"types": ["new-javascript"],

For web workers (including service workers), use new-javascript/worker as the path. If you use a tsconfig.json or jsconfig.json configuration file, you have to exclude the worker files there with the "exclude" option so that the DOM lib doesn't get included by default. If your worker is a JavaScript and not TypeScript file, you then have to manually re-enable type checking for the file via // @ts-check. Also don't forget to exclude the DOM lib with no-default-lib="true". The start of your worker file should look like this:

// @ts-check
/// <reference no-default-lib="true" />
/// <reference types="new-javascript/worker" />

For worklets, use new-javascript/worklet/<WORKLET_NAME> as the path:

/// <reference types="new-javascript/worklet/audio" />
/// <reference types="new-javascript/worklet/paint" />
/// <reference types="new-javascript/worklet/layout" />
/// <reference types="new-javascript/worklet/animation" />

Specifications in this repository

The type declarations in this repository include the following specifications (grouped by venue):




npm i new-javascript

DownloadsWeekly Downloads






Unpacked Size

141 kB

Total Files


Last publish


  • benjaminaster