I’ve heard many of them. For example: rolldown, rspack, swc, oxc, esbuild, parcel, vite etc.
I can currently use JS projects without these tools. What extra do they add? Why should I use them instead of simply using tsc?
Though I must admit I like vite simplicity in front-end.
Most of what you listed are bundlers, and they exist because they go faster. You probably won’t gain much in a small project, but when tsc starts taking 5 to 10 minutes to build - that’s a good time to shop around.
5 minutes? Jesus I wouldn’t wait that long when there’s a simple way to make your build 10x faster.