Modules & Namespaces
Definitely Typed (@types/*)
Install community-maintained type definitions for npm JavaScript packages.
Last Updated: July 29, 2026
•
10 min read
Definitely Typed is the central GitHub repository for community-maintained type definitions (@types/...).
1. Introduction & Architecture
2. Deep Dive & Core Concepts
TypeScript automatically scans node_modules/@types to resolve ambient type declarations for installed packages.
3. Basic Code Example
4. Advanced Production Patterns
5. Interactive Code Playground
console.log("Definitely Typed provides types for un-typed npm packages.");6. Common Pitfalls & Edge Cases
Note: Always install
@types packages as devDependencies because type definitions are only needed during compilation.7. Interview Q&A & Quizzes
Q: What is @types in npm?
A: Scope containing community-contributed type definitions managed via the Definitely Typed repository.
8. Summary Comparison Table
| Package Type | Type Location | Installation |
|---|---|---|
| Native TS Package | Included in main package | npm i package |
npm i -D @types/package |