Updated LKG.

lib/lib.core.d.ts

@@ -1225,7 +1225,7 @@ interface ArrayBuffer {
 interface ArrayBufferConstructor {
     prototype: ArrayBuffer;
     new (byteLength: number): ArrayBuffer;
-    isView(arg: any): boolean;
+    isView(arg: any): arg is ArrayBufferView;
 }
 declare var ArrayBuffer: ArrayBufferConstructor;
 

lib/lib.core.es6.d.ts

@@ -1225,7 +1225,7 @@ interface ArrayBuffer {
 interface ArrayBufferConstructor {
     prototype: ArrayBuffer;
     new (byteLength: number): ArrayBuffer;
-    isView(arg: any): boolean;
+    isView(arg: any): arg is ArrayBufferView;
 }
 declare var ArrayBuffer: ArrayBufferConstructor;
 

lib/lib.d.ts

@@ -1225,7 +1225,7 @@ interface ArrayBuffer {
 interface ArrayBufferConstructor {
     prototype: ArrayBuffer;
     new (byteLength: number): ArrayBuffer;
-    isView(arg: any): boolean;
+    isView(arg: any): arg is ArrayBufferView;
 }
 declare var ArrayBuffer: ArrayBufferConstructor;