wiki/content/20200930105954-ambient_declarations.md

date	id	title
2020-09-30	e1048c95-3baa-445e-a943-bff7b86a0f29	Ambient Declarations

Introduction

Ambient declarations allow you to safely use existing popular JavaScript libraries and incrementally migrate your JavaScript/CoffeeScript/Other-Compile-To-Js-Language project to TypeScript.

Declaration Files

Syntax is simple:

declare var foo: any

Declarations can be put in a .ts or .d.ts file, ie: global.d.ts or vendor.d.ts

Best Practices

• Use .d.ts
• Use interfaces where possible