Ported cjs-module-lexer over to pure Go

[matthewmueller]

I just wanted to share that I ported over the C implementation of cjs-module-lexer to pure Go:

https://github.com/matthewmueller/cjslexer

I think it'd be nice to not have to shell out to another process and deploy esm.sh as a single binary.

Feel free to close this issue if not helpful!

[ije]

nice! does it support condition reexport? for example:

if (process.env.NODE_ENV === "development") {
  module.exports = require("./index.development.js")
} else {
  module.exports = require("./index.production.js")
}