Remove use of const enum.

types/documentdb-server/index.d.ts

@@ -492,8 +492,9 @@ interface IRequest {
     getBody<T>(): T;
     /**
      * Gets the OperationType for the request with a pre-trigger or post-trigger.
+     * Note: This will be one of 'Create', 'Replace', 'Upsert', or 'Delete'.
      */
-    getOperationType(): OperationType;
+    getOperationType(): string;
 	/**
 	 * Gets a specified request header value.
 	 * @param key the name of the header to retrieve
@@ -611,13 +612,6 @@ interface IErrorCodes {
     InternalServerError: number;
 }
 
-declare const enum OperationType {
-    Create = "Create",
-    Replace = "Replace",
-    Upsert = "Upsert",
-    Delete = "Delete"
-}
-
 declare function getContext(): IContext;
 declare var __: I__Object;
 declare var ErrorCodes: IErrorCodes;