Import is reassigned in esm.sh code, but not in source code

[alexgleason]

Seeing this error in my esbuild:

✘ [ERROR] Cannot assign to import "__Process$"

    esm:https://esm.sh/*@lightninglabs/lnc-web@0.3.4-alpha/esnext/lnc-web.mjs?lp=node_modules%252F%2540lightninglabs%252Flnc-web:4:672:
      4 │ ...){o(_())}}}if(__Process$||(__Process$={getuid:()=>-1,getgid:()=>...
        ╵                               ~~~~~~~~~~

  Imports are immutable in JavaScript. To modify the value of this import, you must export a setter function in the imported file (e.g. "set__Process$") and then import and call that function here instead.

The package has code that looks like this:

	if (!globalThis.process) {
		globalThis.process = // ...custom shim
	}

Ref: https://github.com/lightninglabs/lnc-web/blob/ef487d8302ee33e6b2f96d5a1606142e6147ea34/lib/wasm_exec.js#L62

It's treating process as a global, and assigning it if it doesn't exist, which is valid JavaScript code.

But esm.sh treats it as an import of node:process, and rewrites the code similarly to this:

import process from "node:process";
if (!process) {
  process = // custom shim
}

This causes the esbuild error: Imports are immutable in JavaScript, and it refuses to bundle the code.

EDIT: This happens because of Go's wasm implementation and affects any package that deals with wasm files compiled with Go. https://go.dev/wiki/WebAssembly

[alexgleason]

I submitted a pull request to Go for this one: golang/go#75762