Fix build (#864)

Author: saschanaz

inputfiles/idl/Web Background Synchronization.widl

@@ -12,8 +12,9 @@ partial interface ServiceWorkerGlobalScope {
   attribute EventHandler onsync;
 };
 
-[Constructor(DOMString type, SyncEventInit init), Exposed=ServiceWorker]
+[Exposed=ServiceWorker]
 interface SyncEvent : ExtendableEvent {
+  constructor(DOMString type, SyncEventInit init);
   readonly attribute DOMString tag;
   readonly attribute boolean lastChance;
 };

inputfiles/idlSources.json

@@ -528,7 +528,7 @@
         "title": "Web Authentication"
     },
     {
-        "url": "https://wicg.github.io/BackgroundSync/spec/",
+        "url": "https://wicg.github.io/background-sync/spec/",
         "title": "Web Background Synchronization"
     },
     {

package.json

@@ -11,15 +11,15 @@
   },
   "dependencies": {
     "@types/jsdom": "^11.12.0",
-    "@types/node": "^9.6.52",
+    "@types/node": "^9.6.56",
     "@types/node-fetch": "^1.6.9",
-    "@types/webidl2": "^23.8.0",
+    "@types/webidl2": "^23.12.1",
     "cpx2": "^2.0.0",
     "jsdom": "^11.12.0",
     "node-fetch": "^2.6.0",
     "print-diff": "^0.1.1",
     "styleless-innertext": "^1.1.2",
     "typescript": "next",
-    "webidl2": "^23.8.1"
+    "webidl2": "^23.12.1"
   }
 }