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TypeScript saw 275,000 npm downloads in August 2015, a number that jumped to over 2 million in August 2016. DefinitelyTyped, a small repository of declaration files, now contains over 2,000 libraries that have been written by hand by over 2,500 individual contributors.
As for version 2.0, there are a slew of new features added on top of the 1.8 release. Among the highlights are null- and undefined-aware types, control flow based type analysis, tagged union types, the never type, read-only properties and index signatures, this types for functions, and glob support in tsconfig. For a full rundown, check out What’s new in TypeScript.
Microsoft’s pitch for TypeScript is bolder than ever:
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