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Learning TypeScript 2.x - Second Edition
book

Learning TypeScript 2.x - Second Edition

by Remo H. Jansen
April 2018
Beginner content levelBeginner
536 pages
13h 21m
English
Packt Publishing
Content preview from Learning TypeScript 2.x - Second Edition

Type declarations – .d.ts

Sometimes, we will need to consume an existing JavaScript file, but we will not be able to migrate it to TypeScript. A common example of this scenario is when we consume a third-party JavaScript library.

If the library is open source, we could contribute to it by migrating it to TypeScript. However, sometimes, using TypeScript might not align with the preferences of the library authors, or the migration may require a significant amount of work. TypeScript solves this problem by allowing us to create special kinds of files known as type declarations or type definitions.

In the previous chapter, we learned that, by default, TypeScript includes a  lib.d.ts file that provides interface declarations for the built-in JavaScript ...

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Publisher Resources

ISBN: 9781788391474Supplemental Content