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What is definitelytyped?

gaearon/definitelytyped — explained in plain English

Analysis updated 2026-07-17 · repo last pushed 2023-03-21

★ 9Audience · developerComplexity · 2/5DormantSetup · easy

In one sentence

A giant shared library of TypeScript type definitions for thousands of JavaScript libraries, so TypeScript can catch bugs when you use them.

Mindmap

mindmap
  root((repo))
    What it does
      Provides type definitions
      Covers thousands of libraries
      Powers npm types packages
    Tech stack
      TypeScript
      npm
    Use cases
      Add types to a JS library
      Catch bugs early
      Search for missing types
    Audience
      TypeScript developers
      Library maintainers

Code map

Detail Auto

An interactive map of this repo's files and how they connect — its source is parsed live in your browser. Click Visualize to build it.

filefunction / class

What do people build with it?

USE CASE 1

Install @types packages for a JavaScript library to get TypeScript autocomplete and error checking.

USE CASE 2

Search TypeSearch to check if types already exist for a library you're using.

USE CASE 3

Contribute a new or fixed type definition via pull request for a library missing accurate types.

What is it built with?

TypeScriptnpm

How does it compare?

gaearon/definitelytypedaaklon/akinatorabivan-tech/zvec-mcp
Stars999
Language—GoJavaScript
Last pushed2023-03-21——
MaintenanceDormant——
Setup difficultyeasymoderatemoderate
Complexity2/53/53/5
Audiencedeveloperdeveloperdeveloper

Figures from each repo's GitHub metadata at analysis time.

How do you get it running?

Difficulty · easy Time to first run · 5min
No license information was found in the explanation.

Copy-paste prompts

Prompt 1
Where do I find or install TypeScript types for the JavaScript library I'm using?
Prompt 2
Help me write a Definitely Typed type definition file for a small npm package.
Prompt 3
Explain how @types packages relate to Definitely Typed and how they get updated.

Frequently asked questions

What is definitelytyped?

A giant shared library of TypeScript type definitions for thousands of JavaScript libraries, so TypeScript can catch bugs when you use them.

Is definitelytyped actively maintained?

Dormant — no commits in 2+ years (last push 2023-03-21).

What license does definitelytyped use?

No license information was found in the explanation.

How hard is definitelytyped to set up?

Setup difficulty is rated easy, with roughly 5min to a first successful run.

Who is definitelytyped for?

Mainly developer.

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