Most probably you might have reached this blog as part of some issues with building, testing and debugging PCF controls which you are working on. I was also getting the same issues but all of a sudden. To be very specific, I started getting this the very moment I started to do a build for my control today morning and seems to be an issue with the pac version of cli (1.7.2) which we are using. the error messages which you might be getting could be something similar to
“Package subpath ‘./v4” is not defined by “exports” in <<your component path>>” along with “pcf-start exited with code 1” with type error “Cannot read property “compileTime” of undefined”. From my experience out of the suggestions by experts it seems to be an issue with the pcf cli v1.7.2 which is installed in our machines and the later version. We have to wait for a newer version for a complete fix. Until then there is a work around for the same which we will discuss in today’s blog. Hope this will help you.