Add a flag we can use to skip string template calcs in release

trace/trace.d.ts

@@ -11,6 +11,13 @@ declare module "trace" {
      * Disables the trace module.
      */
     export function disable(): void;
+    
+    /**
+     * A field that indicates if the tracer is enabled and there is a point in writing messages.
+     * Check this to avoid writing complex string templates.
+     * Send error messages should even if tracing is disabled.
+     */
+    export var enabled: boolean;
 
     /**
      * Adds a TraceWriter instance to the trace module.

trace/trace.ts

@@ -1,17 +1,17 @@
 import definition = require("trace");
 import * as types from "utils/types";
 
-var _enabled = false;
+export var enabled = false;
 var _categories = {};
 var _writers: Array<definition.TraceWriter> = [];
 var _eventListeners: Array<definition.EventListener> = [];
 
 export function enable() {
-    _enabled = true;
+    enabled = true;
 }
 
 export function disable() {
-    _enabled = false;
+    enabled = false;
 }
 
 export function isCategorySet(category: string): boolean {
@@ -56,7 +56,7 @@ export function write(message: any, category: string, type?: number) {
         }
     }
     
-    if (!_enabled) {
+    if (!enabled) {
         return;
     }
 
@@ -71,7 +71,7 @@ export function write(message: any, category: string, type?: number) {
 }
 
 export function notifyEvent(object: Object, name: string, data?: any) {
-    if (!_enabled) {
+    if (!enabled) {
         return;
     }