Is the idea that a code base reset makes something stop being open source? Or that the number of people doing the reset matters?

I don't see why either of those would be true. The project isn't dead just because it's in a different language now, and for liveness purposes it doesn't matter how it got to that different language.

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avianlyric a day ago | parent [-]

I think the point is that an “open source project” is more than just the code and license, it’s also the community that builds and maintains it.

A fast rewrite of Bun in Rust has effectively alienated most of the people in the Bun community, so in that sense the “open source project” has died. It’s no longer a community project, it’s just become a personal project again.

	▲	Tadpole9181 a day ago \| parent \| next [-]
		Just so everyone know, Bun is and has always been owned by a YC funded org with full time employees. The overwhelming majority of commits came from them.
	▲	Dylan16807 a day ago \| parent \| prev [-]
		A reset is very different from not being open source any more. If losing most of the community would mark a project dead in open source terms, then every new project would be dead on arrival. And that would just be silly.