registration.js

/*globals async, swMessage*/
(function(){
  "use strict";

  // Service Worker registration (installation/activation).
  // if(!("serviceWorker" in navigator)){
  //   console.error("No serviceWorker support!");
  //   return;
  // }
  // var doRegistration = async(function*(){
  //   console.log("Attempting to register SW");
  //   var reg = yield navigator.serviceWorker.getRegistration();
  //   if(!reg){
  //     console.log("No registration, so register");
  //     try{
  //       reg = yield navigator.serviceWorker.register("sw.js");
  //     } catch (err){
  //       console.error("SW Registration failed", err);
  //       return;
  //     }
  //   }
  //   // Registration lets you interact with the SW in different states.
  //   console.log("SW registration", reg);
  //   var sw = yield reg.active;
  //   console.log("Active SW", sw);

  //   //lets chat with our SW
  //   if(!sw){
  //     console.log(`Our SW is ${sw}, because first run...`);
  //     return;
  //   }

  //   // Old school
  //   navigator.serviceWorker.addEventListener("message", function handler(ev){
  //     navigator.serviceWorker.removeEventListener("message", handler);
  //     console.log(ev.data);
  //   });
  //   sw.postMessage({name: "ping"});

  //   // Fancier message using swMessage
  //   var hasFile = swMessage(sw, "isFileInCache");
  //   var results = yield Promise.all([
  //     hasFile({"path": "./"}),
  //     hasFile({"path": "images/twitter_white.svg"}),
  //     hasFile({"path": "images/github.svg"}),
  //     hasFile({"path": "images/w3c_white.svg"}),
  //     hasFile({"path": "images/not-real-file.svg"}),
  //   ]);
  //   console.log("Do we have files?", results);
  // });
  // window.addEventListener("load", doRegistration);
}());