workbox-webpack-plugin getting webpack entry to run instead of swSrc

[mh-alahdadian]

Library Affected:
workbox-webpack-plugin

Issue or Feature Request Description:
Hi
I think that it's a good idea to get a webpack entry name like many of webpack plugins to use for swSrc in InjectManifest

[jeffposnick]

Could you share a use case that demonstrates why using swSrc doesn't meet your needs? Note that the InjectManifest plugin will trigger a child compilation, using the settings from your main webpack compilation, so I'm not aware of major differences between providing the service worker code as a file via swSrc and using a named entry.