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I love all this native tooling for JS making things faster.

I kinda wonder, though, if in 5 or 10 years how many of these tools will still be crazy fast. Hopefully all of them! But I also would not be surprised if this new performance headroom is eaten away over time until things become only just bearable again (which is how I would describe the current performance of typescript).

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Even if they freeze typescript development after the native implementation, given that the current performance was apparently acceptable to the current users, type complexity will just grow to use up the headroom

Plus, using TS directly to do runtime validation of types will become a lot more viable without having to precompile anything. Not only serverside, we'll compile the whole thing to WASM and ship it to the client to do our runtime validation there.

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