[swyx]

on the contrary - tsc is so slow that most people use babel to strip out types in production.

[simlevesque]

What does "strip out types in production" means ? I've never heard of that.

For what I do, Babel is the slow part. switching babel to esbuild (still with tsc) divided my build times by 10.

[manigandham]

The types aren't real anyway, what is there to strip out? Do you mean don't type check for production builds?

[0x000000E2]

Everything is transpired to JS before it hits prod.

But yeah it's slow

[andrew_]

bingo. tsc for dev. sucrase for prod.