Desired functionality

It would be nice to have a hook in the build process, between the index generation and the hash computation, for execute something.

I try to use the Critical lib with my Angular project. First, I build my app, then I use Critical script in order to inline my CSS in the index file : I rewrite my index file. It was messed up with Angular SW, so I submit an issue in Angular's Github (angular/angular#25267).

@gkalpak explains that the issue result from the stored hash mismatch, because of the rewrite of index file.