const myFirstZone = Zone.current.fork({
    name: 'my first zone',

    onInvoke(parentZoneDelegate, _, targetZone, delegate, applyThis, applyArgs, source) {
        console.log('somewhere was called method `run`');
        return parentZoneDelegate.invoke(targetZone, delegate, applyThis, applyArgs, source);
    },

    onScheduleTask(parentZoneDelegate, _, targetZone, task) {
        console.log('somewhere we have called async task and callback will be call later in our zone...');
        return parentZoneDelegate.scheduleTask(targetZone, task);
    },

    onInvokeTask(parentZoneDelegate, _, targetZone, task, applyThis, applyArgs) {
        console.log('somewhere was called callback of async task...');
        return parentZoneDelegate.invoke(targetZone, task, applyThis, applyArgs);
    }

    onHasTask(parentZoneDelegate, _, targetZone, hasTaskState) {
        console.log(hasTaskState);
        return parentZoneDelegate.hasTask(targetZone, hasTaskState);
    }
});

myFirstZone.run(() => {
    setTimeout(() => {
        console.log('hello after 3 sec');
    }, 3000);
});