commonJS module's this should be window in browser

[vjpr]

What version of Bun is running?

0.6.10

What platform is your computer?

macos

What steps can reproduce the bug?

Try use source-map library in a bundle.

isBrowserEnvironment check fails.

Transpiled code:

var __commonJS = (cb, mod) => () => (mod || cb((mod = { exports: {} }).exports, mod), mod.exports);

...

var require_read_wasm = __commonJS((exports, module) => {
  var __dirname = "/Users/Vaughan/dev-mono/thirtyfive/node_modules/.pnpm/source-map@0.7.4/node_modules/source-map/lib";
  var isBrowserEnvironment = function() {
    return typeof window !== "undefined" && this === window;
  }.call();
  if (isBrowserEnvironment) {

this === window fails...this is undefined.

What is the expected behavior?

this should be window.

What do you see instead?

It's undefined.

Additional information

The use of () => {} instead of function probably causes this as it removes the this binding.

[vjpr]

Nevermind, was an issue in original package.

mozilla/source-map#459