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From what I've seen, yes.

I'm a big fan of ES6 and I haven't been a fan of typed languages for a long time but I'm liking using TypeScript. So are my coworkers.

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Since we all tend to live in bubbles to some extent, do we have any numbers to back this up (like, # of repos/commits in each language on GitHub, or questions on StackOverflow)?

I tend to view TypeScript similar to CoffeeScript — it brings to JavaScript some features from other languages that are convenient and preferred by a subset of frontend developers. It allows for experimentation in the language, and helps inform TC39 proposals.

In time, I suspect support will coalesce around a specific TC39 process proposal to add type support, it will graduate to stage 3 or 4, get integrated into browsers and Babel, and enthusiasm around TypeScript will wane.

A flexible type system like that of TypeScript is pretty big and complex. It would take considerable time and effort to get that through TC39, I think. It could happen, but seems far off to me.

For data, 46% of npm's survey respondents used TypeScript: https://blog.npmjs.org/post/180868064080/this-year-in-javasc...

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