Rome: An experimental JavaScript toolchain
Great idea, very much welcome in the fragmented JS community.However, I am sceptical about performance of a tool written in TypeScript/JavaScript. We've seen that tools written in compiled languages like Rust or Go can be much faster, e.g. 
https://swc-project.github.io/, https://packem.github.io/, 
https://github.com/nathan/pax, https://github.com/evanw/esbuild.On the other hand, Yarn is written in JS and it is considered fast enough. Facebook has a good track record for writing well designed tools.