fix(workbox): precache start_url (resolves #372)

Author: pi0

lib/manifest/module.js

@@ -40,6 +40,7 @@ module.exports = function nuxtManifest (nuxt, pwa) {
     nuxt.options.manifest = {}
   }
   Object.assign(nuxt.options.manifest, manifest)
+  Object.assign(pwa.manifest, manifest)
 
   // Register webpack plugin to emit manifest
   const manifestSource = JSON.stringify(manifest, null, 2)

lib/workbox/options.js

@@ -61,6 +61,11 @@ function getOptions (nuxt, pwa) {
     })
   }
 
+  // Add start_url to precaching
+  if (pwa.manifest && pwa.manifest.start_url) {
+    options.preCaching.unshift(pwa.manifest.start_url)
+  }
+
   // Add offlineAssets to precaching
   if (options.offlineAssets.length) {
     options.preCaching.unshift(...options.offlineAssets)