swc VS tsup

First, we switched the default compiler for new projects from Babel to SWC (Speedy Web Compiler). SWC is dramatically faster than Babel and requires zero configuration. We’ll continue to support Babel in any project currently using it.

SWC

As the reference explains “**SWC** (Speedy Web Compiler) is an extensible Rust-based platform that can be used for both compilation and bundling. Using SWC with Nest CLI is a great and simple way to significantly speed up your development process.”

This is specifically about breaking the myth that performing expensive self-contained operations (e.g, parsing GraphQL) in a native extension (C, Rust, etc.) is always faster than the interpreted language.

The JS ecosystem has the same problem, people think rewriting everything in Rust will be a magic fix. In practice, there's always the problem highlighted in the post (transitioning is expensive, causes optimization bailouts), as well as the cost of actually getting the results back into Node-land. This is why SWC abandoned the JS API for writing plugins - constantly bouncing back and forth while traversing AST nodes was even slower than Babel (e.g https://github.com/swc-project/swc/issues/1392#issuecomment-...)

Why Speedy Web Compiler ?

FTA is a TypeScript static analysis tool built on the speedy foundations of swc. FTA is fast; capable of analyzing more than 150 files per second on typical hardware, it offers a powerful addition to your code quality toolkit.

Very cool! I'm curious, is this intended for dev tooling?

For example, I could see this (or something similar) being useful as the engine for a typescript language server that would be faster than the standard one

But if it's not aimed at 1:1 with tsc, would it be intended more for something like swc[1]?

Or what would you expect people to use this for, besides just being a cool project to learn from?

[1] https://github.com/swc-project/swc

This is... good news, but I still cannot fathom using the default Typescript compiler for regular development. Seriously, leave the type-checking to your IDE and CICD chain, and switch to using tsx (https://www.npmjs.com/package/tsx) or swc (https://swc.rs/) and you will _immediately_ notice the difference in speed and productivity.

Now, we can run all this server reaching the port 4000. If you want to test, build it with tsup or any other way that you want, like ts-node.

If you're building hooks, providers & components you can go with only React + TypeScript, and use something ESBuild or tsup to build it.

I am using `tsup` to transpile my application - https://github.com/egoist/tsup

I spent way to much time over the last couple days trying to line up vite/rollup to bundle my component library with types, type maps and the correct formats. Until I ran across this blog post which introduced me to https://github.com/egoist/tsup and it all just worked in a single readable command. I figured I'd share with you beautiful people so you could get your code bundled faster and carry on with the fun part of programming.

As we iterate on the definition, we are going to want a better developer experience for rebuilding the package on changes. Typically, for a “library” or “utility” style package, I’d reach for either unbuild’s stub concept or use esbuild/tsup/rollup to implement a more traditional watch/rebuild, but in this case, I’m watching a proto file that lives outsides of the source, which breaks assumptions of those tools.

My most recent project uses tsup to package a CJS and a ESM version separately, and I just publish both. It's too early to go full ESM, but I also don't want to stay on CJS, granted that we've been slowly moving away from it. To me as a dev it makes no difference, but if you want to use one or the other as a library consumer, you have a choice in my package

If you want to stay in that ecosystem, try tsup. But you should still try to wire up a canonical tsc-based project first to understand the fundamentals.

Have a look at tsup (https://tsup.egoist.dev) and microbundle (https://www.npmjs.com/package/microbundle)...

I actually recommend using tsup to build instead of tsc. It can bundle if you want, makes it easier to output multiple formats if you want, etc. It's also dead simple and lightning fast (like, MUCH faster than tasc). It's zero config so the build script is as simple as this.