Very interesting, but without an ecosystem I doubt this person can keep maintaining it long term. Bun users who don't care about slop will continue to use Bun, those who care will go back to Node.js, and there isn't much left for this project. It is a gigantic task to maintain a JS runtime and add features.
Deno doesn't seem to have as much momentum ever since Bun showed up, and there is concern about the status of the company. I doubt anyone wants to rely on Deno at this time.
Node.js has come a long way, and its support for TS is fairly good these days. Of course it's not an "all-in-one" experience, but I really don't know if it matters. Setting up a bundler is easier than ever, and for complex/niche use cases, you'll likely need webpack instead of whatever comes with Bun. Let alone all the other options that take care of the entire build toolchain.
Choosing a runtime just for the tools it brings isn't as good a decision it seems.
