[rollup-plugin-workbox] emit files

[scola84]

generateSw and injectManifest from workbox-build write the service-worker file directly to disk. This means that in the context of rollup there is no opportunity to apply other plugins on the file, e.g. gzip. Would it be possible to read the content of the service-worker file and emit it as an asset using this.emitFile in the writeBundle (or any other possibly more suitable) hook in rollup-plugin-workbox?