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Came here to mention how slow and sometimes awkward ts-jest is. I'll have to try out Ava and the others. I think jest is a great asset over mocha/jasmine/sinon/chai but it gets awkward in the typescript realm. Also thinking about how since it really isn't type aware (especially for mocks) that it loses some points compared to the ecosystems like mockito, nsubstitute, etc.

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I was surprised that every Jest+TypeScript guide says to use ts-jest. I already have my IDE, the TypeScript watcher, and ESLint parsing/compiling all the code! I don't want to add fourth one :-P

I ended up just pointing Jest at my build output folder and that works. There are a couple minor annoyances but whatever.

(I actually started with Ava because it more directly supports using the existing build output, but I ran into another issue and had to switch back to Jest: https://github.com/avajs/ava/issues/2385)

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