tsedition

// main.js
const obj = { foo: 'bar', baz: 42 };
const keys = Object.keys(obj);

const worker = new Worker('worker.js');
worker.postMessage(keys);

worker.onmessage = function (event) {
  if (event.data.type === 'get') {

  }
};

//------------------------------------------------

// worker.js
onmessage = function (event) {
  const keys = event.data;
  const proxy = new Proxy({}, {
    get(target, prop) {
      return new Promise(resolve => {
        postMessage({ type: 'get', key: prop });
        onmessage = function (event) {
          if (event.data.type === 'get' && event.data.key === prop) {
            resolve(event.data.value);
          }
        };
      });
    }
  });
  postMessage({ type: 'ready' });
  onmessage = function (event) {
    if (event.data.type === 'get' && keys.includes(event.data.key)) {
      postMessage({
        type: 'response',
        key: event.data.key,
        value: obj[event.data.key]
      });
    }
  };
};