How to get sourcemapped stack from JavaScript Error object in the Browser?

When I create err = new Error("test-error") and console.log(err) I can see the stack mapped to the original sources using the sourcemap in the developer console.

But when I read the err.stack property I get a string which is not source-mapped. It shows files and line numbers from generated files.

How do I get the source-mapped stack from the err object?