[thunfischtoast]

Call me incompetent, but I don't get it.

> I switched the build to SWC, and server restarts dropped to under a second.

What is SWC? The blog assumes I know it. Is it https://swc.rs/ ? or this https://docs.nestjs.com/recipes/swc ?

[TheRoque]

Both links are the same, SWC in this context is probably Speedy Web Compiler. It transpiles really fast but doesn't do any type checks.

[maleldil]

> It transpiles really fast but doesn't do any type checks

What's the point of using it during development, then?

[OscarDC]

Transpilation is here a necessary step to test the application because e.g. his browser won't be able to parse raw TypeScript code.

Typechecking is not: the browser doesn't care about it, it's mainly to help the developer verify its code.

So to speed-up the build during development (to have faster iterations) the idea is often to make the building process only about the build by removing "unnecessary" steps like type-checking from it, while having a separate linting / typechecking etc. process, which could even run in parallel - but not be necessary to be able to test the application.

This is often done by using tools like a bundler (e.g. esbuild) or a transpiler (babel, swc) to erase the types without checking them in your bundling process.

[michaelsalim]

Pretty sure they're the same thing. The second link is on how to use swc with nestjs.

[just-tom]

In the links you provided, swc is the same entity.