[web] Update packages, use TS 2.4

web/inc/luci-operation/operation.ts

 /*
   Copyright 2016 The LUCI Authors. All rights reserved.
   Use of this source code is governed under the Apache License, Version 2.0
   that can be found in the LICENSE file.
 */
 
 namespace luci {
 
   /**
    * An Operation wraps a Promise, adding methods to cancel that Promise.
@@ skipping 14 matching lines @@
     static CANCELLED = new Error('Operation is cancelled');
 
     private _cancelled = false;
     private cancelCallbacks = new Array<() => void>();
 
     /**
      * Wraps a Promise, returning a Promise whose resolve and reject methods
      * will throw a CANCELLED error if this Operation has been cancelled.
      */
     async wrap<T>(p: Promise<T>) {
-      return new Promise((resolve, reject) => {
+      return new Promise<T>((resolve, reject) => {
         p.then(
             result => {
               this.assert();
               resolve(result);
             },
             err => {
               this.assert();
               reject(err);
             });
       });
@@ skipping 55 matching lines @@
         this.cancelCallbacks.splice(index, 1);
       }
     }
   }
 
   /** Perform an asynchronous call. */
   function asyncCall(fn: () => void) {
     window.setTimeout(fn, 0);
   }
 }