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it's fast because it doesnt do the thing that everyone else does to be useful which is type checking

This is dishonest. In esbuild's benchmarks, webpack, rollup, and parcel do not do typechecking either.

I like the idea of having type checking moved out of the watch path, or at least be in a second window watching, so building is faster. But you get your type checking errors too.

You also have the editor finding issues for you, which is where I want that caught.

Yes this seems like an excellent performance boost to development. Parallelize type checking and compilation. We all have these many-core machines now, and so many tools that single thread the world unnecessarily.

You may want to check out this webpack plugin [1], though I'm not sure how much it could get you there.

[1] https://github.com/TypeStrong/fork-ts-checker-webpack-plugin...

Nope. This is wrong. It clearly mentions that its only a Javascript and CSS bundler and nothing much. It doesnt try to solve every problem in the JS world. None of the other bundlers do type checking by themselves. They are always through plugins.

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