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TypeScript allows you to have Declaration Files which are files that allow you to describe the shape of code that's written in (for example) plain JavaScript. So, by referencing one of these files you tell TypeScript exactly how that JavaScript code or library you are using should be assumed to be "typed". Of course, this means that the declaration file need to be carefully written and in sync with the JavaScript library you are using.
DefinitelyTyped is the most popular repository of Declaration Files for many many JavaScript libraries most of which do not provide their own declaration files (as they are not developed with TypeScript and are not committed to work with it). So it holds Declaration files maintained by the community.
By using DefinitelyTyped and the declaration files it contains you can use most of the popular JavaScript libraries as if they were TypeScript libraries in the sense that you will have type validation by the compiler (as the declaration file indicates). Also, being so popular, DefinitelyTyped will be curated by the community to contain valid declaration files (although, web development being something that moves really fast, you may end up finding a couple of issues specially in obscure libraries).
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everything is already merged.
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Posted on Utopian.io - Rewarding Open Source Contributors
Hi! I am a robot. I just upvoted you! I found similar content that readers might be interested in:
https://stackoverflow.com/questions/39907142/what-is-definitelytyped
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@stephenhawking, I like your contribution to open source project, so I upvote to support you.
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On your previous post ''cheetah'' bot found your introduction on somewhere else, and you kept using it.
In utopian, we do not allow copy / paste from someone else's work, it is considered as plagiarism. It is important for us to see If user understand the concept enough to write description by themselves.
So please write your original intro next time.
Your contribution has been approved for this one.
Consider you have been warned.
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Hey @stephenhawking I am @utopian-io. I have just upvoted you!
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