Really hope this gets a competent library mode. Webpacks library mode never really evolved to meet the needs of things. Vite has a good library mode but it has its own limitations.
Pure rollup is still the best for building libraries, by and large (maybe esbuild now? but I think rollup is more efficient in its output still).
If this has a good, solid library mode that works like rollup with the power of the webpack-like asset graph, it'd actually be amazing for the community as a whole.