Idea: Jest Support

[exsurgo]

ESRun should support Jest out-of-the-box.

Jest seems to be the primary test framework for Node these days. It would be great to have ESRun just work with it, without any additional setup or configs.

I tried to get it to work with ESRun, but was unsuccessful. Perhaps it could be implemented to work as a --loader? I was able to get my own TypeScript/ESM/Mapped Paths setup working with ts-jest, but it took a good amount of trial and error effort.

[Gin-Quin]

That's rather a Jest issue than a Esrun issue. Jest is losing popularity and it uses some old tools like babel, I'm not surprised it's not compatible with Typescript.

Some ways to go:

• you can try using esbuild-jest.
• you can search for other testing frameworks that support Typescript better than Jest, like Vitest (it's front-end-oriented, but I think it works for unit tests too).
• create a plugin similar to esbuild-jest that uses Esrun.
• leave Node and start using Bun 😝 Seriously, it might be the best advice. I switched to Bun with my newest projects. It's a better Node that can natively execute Typescript files, and has its own Jest-like test suite (just run bun test).