LESSON 4.3
Declaration files and untyped packages
Learn key techniques and workflows in TypeScript for Application Developers.
5m
intermediate
9,544 students
Overview
Sooner or later a dependency ships no types. Writing a small declaration file is faster and safer than sprinkling any across your codebase.
In this lesson you will:
- Write a minimal declaration for an untyped module
- Augment the types of an existing package
- Declare global types without polluting every file
Pro Tip
Use caching and revalidation wisely to ensure your app stays fast and data remains fresh without unnecessary requests.