In my javascript/typescript app I suddenly am unable to debug and pause on my breakpoints. When I go to sources tab I can only add a breakpoint on the first lines, the rest are grayed out as not applicable as shown below:

A strange behavior is when I put a debugger; keyword in the file, dev-tools debugger stops in that file but at the first line.

I've tried hard reload in browser to clean cache, deleting build and node_modules and rebuilding the app to no avail.