November 2019
Beginner
804 pages
20h 1m
English
Content preview from Learn TypeScript 3 by Building Web Applications
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TypeScript type definitions (typings)
In TypeScript, most of the time, we also need to install type definitions (also called typings) separately for the JavaScript libraries that we use. Type definitions are files used by the TypeScript compiler to help us out while coding and compiling. They contain all the information about types that are used in a library: interfaces, classes, module declarations, custom types, and more.
When the TypeScript compiler finds type definition files, they're included in the compilation scope and the definitions are ambient. You can learn more about that here: https://medium.com/@mikenorth/guide-to-typescript-ambient-declarations-717ef6da6514.
Without type definitions, the TypeScript compiler wouldn't know much ...
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