“Ultimately we don’t want to be in the business of writing HTTP servers.”
Deno launched on a pure TypeScript standard library HTTP server. Less than a year after 1.0, it is bolting on Hyper, a Rust server, because the TypeScript one was stuck on HTTP/1.1. Hello world got 48 percent faster. The pitch was a clean rewrite of Node, and the fast parts keep turning out to be Rust.