I'm very bullish on esbuild. But in testing with my own app, it produces output 8-12% bigger than the same files processed with terser. I would bet that it's a small number of optimizations that are missing that benefit codebases like mine (JSX-heavy).

My biggest frustration is that I am not nearly as skilled in Go as I am in other languages, and don't have the confidence jumping into a large existing Go codebase than I would with JS/TS/etc. I have the same issue with Flow, which is written in OCaml.