Generated service worker doesn't claimClient or skipWaiting on Chrome 71 incognito

[kennsippell]

I am generating a service worker script with the following config:

  const config = {
    cacheId: 'cache',
    claimsClient: true,
    skipWaiting: true,
    directoryIndex: false,
    handleFetch: true,
    staticFileGlobs: [
      path.join(staticDirectoryPath, 'manfiest.json'),
    ],
    dynamicUrlToDependencies: {
      [rootUrl]: [path.join(staticDirectoryPath, 'templates', 'inbox.html')],
    },
    stripPrefixMulti: { [staticDirectoryPath]: '' },
    maximumFileSizeToCacheInBytes: 1048576 * 20,
    verbose: true,
  };

  return swPrecache.write(outputPath, config);

The claimsClient: true and skipWaiting: true were working fine for me until I upgrade to Chrome 71. Now when I open a Chrome 71 incogneto window and navigate to the page which registers the service worker, I see the service worker in an "installing..." state. I would expect it to be Installed since it should claim the browser and skip any waiting.

I suspect this isn't an sw-precache issue, but I'm reaching out to better understand the roots for this issue and any workarounds. This same situation is happening for headless Chrome during automated testing.