wtfStartTimeRange

export wtfStartTimeRange

Used to mark Async start. Async are similar to scope but they don't have to be strictly nested. The return value is used in the call to [endAsync]. Async ranges only work if WTF has been enabled.

someMethod() {
   var s = wtfStartTimeRange('HTTP:GET', 'some.url');
   var future = new Future.delay(5).then((_) {
     wtfEndTimeRange(s);
   });
}