Cannot get any value from TaskProcessor.scheduleTask

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