Wasm comes to mind, execution time in the browser will probably be ok, but size is a big deal

Accidents happen, and people panic. Maybe she thought she was pressing the breaks and made the problem worse. I highly doubt anyone would do it intentionally.

Usually when code is minified, it is shipped alongside a sourcemap (*.js.map), which can be used by the browser to show you the original code.

If you get an error in the browser, you can click the error, which will take you to the network(?) tab and show you exactly where the error occurred