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There's not really a gap between them. I've spoken to people on the TypeScript team a number of times. Jonathan Turner and I talked about sharing ASTs once, and I gave an internal presentation about Babel at Microsoft last year. Also, there's tons of people that use TypeScript for type-checking and stripping types and then use Babel for compiling down ES2015 code since Babel follows the spec closer.

Not to mention that currently Typescript doesn't emit certain types of polyfills so it can be handy to let Babel manage that.

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