Make isLong a TypeScript type guard (#63)

tom5760 · dcodeIO · commit 6f10b74ac6f1 · 2018-07-18T17:48:03.000+02:00
diff --git a/index.d.ts b/index.d.ts
@@ -99,7 +99,7 @@ declare class Long {
     /**
      * Tests if the specified object is a Long.
      */
-    static isLong(obj: any): boolean;
+    static isLong(obj: any): obj is Long;
 
     /**
      * Converts the specified value to a Long.
