Cannot get any value from TaskProcessor.scheduleTask

CesiumJS
1

Hi Team,

I’m trying to use Cesium.TaskProcessor.scheduleTask to use web worker that can use Cesium object.

I’m facing issue in getting the resolve value from promise object of Cesium.TaskProcessor.scheduleTask

Tried #1, #2 method below but both failed,
main.js

        let worker = new Cesium.TaskProcessor('worker.js');

        let resPromise = worker.scheduleTask({"foo":"bar"}, [this._viewer.scene]);

        console.log("Cesium worker",worker)
        console.log("resPromise",resPromise)

        #1 
        Cesium.when(resPromise,e =>{

            console.log("cesium task1", e)
        });
        #2
        resPromise.then(e=>{
        console.log("cesium task2", e)
        })

worker.js

self.onmessage= function(ev) {
    console.log("workerrrrrrrr, public",ev);

    postMessage("hello from worker");

Please give me a working snippet if able.

REF
https://cesium.com/learn/cesiumjs/ref-doc/TaskProcessor.html?classFilter=task

var taskProcessor = new Cesium.TaskProcessor('myWorkerPath');
var promise = taskProcessor.scheduleTask({
    someParameter : true,
    another : 'hello'
});
if (!Cesium.defined(promise)) {
    // too many active tasks - try again later
} else {
    Cesium.when(promise, function(result) {
        // use the result of the task
    });
}

Thanks in advance,
Hiroshi