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I started using Evan Wallace's TypeScript [0] implementation (and bundler) written in Go and it's pretty fast (there are benchmarks too). I'm surprised this kind of thing is not something Deno's pursuing. Having used esbuild I see the future of web tooling as not necessarily written in (or compiled to) JavaScript.

[0] https://github.com/evanw/esbuild

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They are considering switching from tsc to a TypeScript compiler written in Rust[0][1], and `deno fmt` subcommand already uses it internally.

[0] https://github.com/denoland/deno/issues/5432 [1] https://github.com/swc-project/swc

swc is not a TypeScript compiler, it doesn't do any typchecking. It just strips out types and outputs JavaScript.

Esbuild isn't a typechecker, it's a bundler.

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