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the thing about Typescript is that it is nicer to write Javascript code that interfaces with Typescript code than Javascript code that interfaces with Javascript.
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admittedly you can get most of these benefits by writing JSDoc comments on regular Javascript. but that's basically just a more annoying way to write Typescript.
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not many languages where interfacing with them is easier than interfacing with the language you're writing in
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but then arguably Typescript is more of a souped up linter than a language