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.

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Deprecated: the Web Tracing Framework is no longer supported in Angular

const wtfStartTimeRange: (rangeType: string, action: string) => any;

Description

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