Modules & Namespaces
Module Resolution — Node, Bundler, Classic
Understand tsconfig moduleResolution strategies for Node and Webpack/Vite.
Last Updated: July 29, 2026
•
10 min read
Module resolution determines how TypeScript mimics runtime module lookup paths.
1. Introduction & Architecture
2. Deep Dive & Core Concepts
Modern frontend apps use "moduleResolution": "bundler", whereas Node ES packages use "moduleResolution": "nodenext".
3. Basic Code Example
4. Advanced Production Patterns
5. Interactive Code Playground
console.log("Module resolution determines file lookup rules.");6. Common Pitfalls & Edge Cases
Warning: Under
nodenext, relative TypeScript imports must include the .js extension!7. Interview Q&A & Quizzes
Q: What does 'moduleResolution: bundler' do?
A: It relaxes Node file extension rules to match Vite and Webpack bundler resolution behaviors.
8. Summary Comparison Table
| Strategy | Target Environment | Extension Requirement |
|---|---|---|
nodenext | Node.js ESM | Required (.js) |
bundler | Webpack / Vite / Next.js | Omit extensions |