Error doesn't show original code position

[3cp]

The error proxied to embedded app console only shows entry-bundle line no and column no.
While the real browser console shows the error with proper source map link, the information (original source map position) is not in the error event object, hence is not sent to the embedded app console.

Might need https://github.com/evanw/node-source-map-support to alter the original error event.