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IMO MS should focus on making tsc faster, browsers shouldn't have this added complexity for no benefit. This would also seem to encourage shipping extra non-functional code to users. If the only benefit is in development then that could just be served by sourcemaps.

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This is "making tsc faster," by allowing developers not to run it. You can't get faster than that!

Untrue, devs will still need to run it to check types.

It's true in the sense that developers are also allowed to not run ESLint. You can and should run it, but you don't need it to try out your code.

one potential benefit here is developing in your target environment, which currently almost none of us are

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