oh yikes, the fact that it's closed as "irrelevant" is rather worrisome. how is it irrelevant to ask where the source code is for a project hosted on an open source hosting platform.
one of their top talking points is "Its crust is built with Rust", but without source to verify this it might as well be written in brainfuck.
(And swc is more similar to Babel than to Webpack/Parcel.)