I'm not sure I understand what you're saying. If there was a Go->Bash transpiler (or a JS->Bash one), yes, we would theoretically end up with a Bash parser and interpreter in Bash.
I'm going to go on assuming that you're not being sarcastic :)
As I mentioned in another comment, once Go's wasm support is shipped and stable, I hope to make the JS package smaller and better. Until then, this is the best I can do without manually rewriting the Go code in JS.