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28 lines
551 B
Markdown
28 lines
551 B
Markdown
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---
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id: e1048c95-3baa-445e-a943-bff7b86a0f29
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title: Ambient Declarations
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---
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# Introduction
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Ambient declarations allow you to safely use existing popular JavaScript
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libraries and incrementally migrate your
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JavaScript/CoffeeScript/Other-Compile-To-Js-Language project to
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TypeScript.
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# Declaration Files
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Syntax is simple:
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``` typescript
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declare var foo: any
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```
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Declarations can be put in a `.ts` or `.d.ts` file, ie: `global.d.ts` or
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`vendor.d.ts`
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# Best Practices
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- Use `.d.ts`
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- Use [interfaces](20200929162220-interfaces) where possible
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