observable-webworkers/dist/src/index.js

A way to eavesdrop on Web Worker messages

const events = {};
const observable = (worker) => {
    worker.addEventListener('message', (event) => {
        observable.dispatchEvent('message', worker, event);
    });
    if (worker.port != null) {
        worker.port.addEventListener('message', (event) => {
            observable.dispatchEvent('message', worker, event);
        });
    }
};
observable.addEventListener = (type, fn) => {
    if (events[type] == null) {
        events[type] = [];
    }
    events[type].push(fn);
};
observable.removeEventListener = (type, fn) => {
    if (events[type] == null) {
        return;
    }
    events[type] = events[type]
        .filter(listener => listener === fn);
};
observable.dispatchEvent = function (type, worker, event) {
    if (events[type] == null) {
        return;
    }
    events[type].forEach(fn => fn(worker, event));
};
export default observable;
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