fix: stack rewriting now works with source maps

In Chrome for the source maps to work the object must be an instance of
native `Error`. This means that we can’t return a subclass of `Error`
or error handling in the dev console will not work properly.

In addition the stack frames must have a certain format or the source
mapping is disabled. For this reason we have changed the long stack
format to conform to that shape.

Author: mhevery

lib/browser/browser.ts

@@ -18,7 +18,7 @@ const set = 'set';
 const clear = 'clear';
 const blockingMethods = ['alert', 'prompt', 'confirm'];
 const _global: any =
-    typeof window === 'object' && window || typeof self === 'object' && self || global;
+    typeof window !== 'undefined' && window || typeof self !== 'undefined' && self || global;
 
 patchTimer(_global, set, clear, 'Timeout');
 patchTimer(_global, set, clear, 'Interval');

lib/common/timers.ts

@@ -23,13 +23,14 @@ export function patchTimer(window: any, setName: string, cancelName: string, nam
 
   function scheduleTask(task: Task) {
     const data = <TimerOptions>task.data;
-    data.args[0] = function() {
+    function timer() {
       try {
         task.invoke.apply(this, arguments);
       } finally {
         delete tasksByHandleId[data.handleId];
       }
     };
+    data.args[0] = timer;
     data.handleId = setNative.apply(window, data.args);
     tasksByHandleId[data.handleId] = task;
     return task;

lib/common/utils.ts

@@ -15,7 +15,8 @@
 declare const WorkerGlobalScope: any;
 
 export const zoneSymbol: (name: string) => string = (n) => `__zone_symbol__${n}`;
-const _global: any = typeof window === 'object' && window || typeof self === 'object' && self || global;
+const _global: any =
+    typeof window === 'object' && window || typeof self === 'object' && self || global;
 
 export function bindArguments(args: any[], source: string): any[] {
   for (let i = args.length - 1; i >= 0; i--) {

lib/zone-spec/long-stack-trace.ts

@@ -11,17 +11,19 @@
  */
 
 const NEWLINE = '\n';
-const SEP = '  -------------  ';
-const IGNORE_FRAMES: string[] = [];
+const IGNORE_FRAMES: {[k: string]: true} = {};
 const creationTrace = '__creationTrace__';
+const ERROR_TAG = 'STACKTRACE TRACKING';
+const SEP_TAG = '__SEP_TAG__';
+let sepTemplate = '';
 
 class LongStackTrace {
   error: Error = getStacktrace();
   timestamp: Date = new Date();
 }
 
 function getStacktraceWithUncaughtError(): Error {
-  return new Error('STACKTRACE TRACKING');
+  return new Error(ERROR_TAG);
 }
 
 function getStacktraceWithCaughtError(): Error {
@@ -49,22 +51,24 @@ function addErrorStack(lines: string[], error: Error): void {
   for (let i = 0; i < trace.length; i++) {
     const frame = trace[i];
     // Filter out the Frames which are part of stack capturing.
-    if (!(i < IGNORE_FRAMES.length && IGNORE_FRAMES[i] === frame)) {
+    if (!IGNORE_FRAMES.hasOwnProperty(frame)) {
       lines.push(trace[i]);
     }
   }
 }
 
 function renderLongStackTrace(frames: LongStackTrace[], stack: string): string {
-  const longTrace: string[] = [stack];
+  const longTrace: string[] = [stack.trim()];
 
   if (frames) {
     let timestamp = new Date().getTime();
     for (let i = 0; i < frames.length; i++) {
       const traceFrames: LongStackTrace = frames[i];
       const lastTime = traceFrames.timestamp;
-      longTrace.push(
-          `${SEP} Elapsed: ${timestamp - lastTime.getTime()} ms; At: ${lastTime} ${SEP}`);
+      let separator =
+          `____________________Elapsed ${timestamp - lastTime.getTime()} ms; At: ${lastTime}`;
+      separator = separator.replace(/[^\w\d]/g, '_');
+      longTrace.push(sepTemplate.replace(SEP_TAG, separator));
       addErrorStack(longTrace, traceFrames.error);
 
       timestamp = lastTime.getTime();
@@ -105,42 +109,15 @@ function renderLongStackTrace(frames: LongStackTrace[], stack: string): string {
   },
 
   onHandleError: function(
-      parentZoneDelegate: ZoneDelegate, currentZone: Zone, targetZone: Zone, error: any): any {
+      parentZoneDelegate: ZoneDelegate, currentZone: Zone, targetZone: Zone, error: any): boolean {
     const parentTask = Zone.currentTask || error.task;
     if (error instanceof Error && parentTask) {
-      let stackSetSucceeded: string|boolean = null;
+      const longStack =
+          renderLongStackTrace(parentTask.data && parentTask.data[creationTrace], error.stack);
       try {
-        let descriptor = Object.getOwnPropertyDescriptor(error, 'stack');
-        if (descriptor && descriptor.configurable) {
-          const delegateGet = descriptor.get;
-          const value = descriptor.value;
-          descriptor = {
-            get: function() {
-              return renderLongStackTrace(
-                  parentTask.data && parentTask.data[creationTrace],
-                  delegateGet ? delegateGet.apply(this) : value);
-            }
-          };
-          Object.defineProperty(error, 'stack', descriptor);
-          stackSetSucceeded = true;
-        }
+        error.stack = (error as any).longStack = longStack;
       } catch (err) {
       }
-      const longStack: string = stackSetSucceeded ?
-          null :
-          renderLongStackTrace(parentTask.data && parentTask.data[creationTrace], error.stack);
-      if (!stackSetSucceeded) {
-        try {
-          stackSetSucceeded = error.stack = longStack;
-        } catch (err) {
-        }
-      }
-      if (!stackSetSucceeded) {
-        try {
-          stackSetSucceeded = (error as any).longStack = longStack;
-        } catch (err) {
-        }
-      }
     }
     return parentZoneDelegate.handleError(targetZone, error);
   }
@@ -161,11 +138,19 @@ function computeIgnoreFrames() {
   for (let i = 0; i < frames1.length; i++) {
     const frame1 = frames1[i];
     const frame2 = frames2[i];
+    if (!sepTemplate && frame1.indexOf(ERROR_TAG) == -1) {
+      sepTemplate = frame1.replace(/^(\s*(at)?\s*)([\w\/\<]+)/, '$1' + SEP_TAG);
+    }
     if (frame1 === frame2) {
-      IGNORE_FRAMES.push(frame1);
+      IGNORE_FRAMES[frame1] = true;
     } else {
       break;
     }
+    console.log('>>>>>>', sepTemplate, frame1);
+  }
+  if (!sepTemplate) {
+    // If we could not find it default to this text.
+    sepTemplate = SEP_TAG + '@[native code]';
   }
 }
 computeIgnoreFrames();