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Try replacing
import Worker from "worker-loader!./Worker.js";
With this snippet from the docs
import Worker from "./file.worker.js";
const worker = new Worker();
worker.postMessage({ a: 1 });
worker.onmessage = function (event) {};
worker.addEventListener("message", function (event) {});
if that doesn’t work I have had success by changing the previous line to
import Worker from 'worker-loader!./file.worker.js';
from this StackOverflow Answer
Source:stackexchange.com