Function waitFor

docs/engine.io-protocol/v4-test-suite/test-suite.js:41–49

(socket, eventType)

}

function waitFor(socket, eventType) {
  if (socket._eventBuffer[eventType].length) {
    return Promise.resolve(socket._eventBuffer[eventType].shift());
  } else {
    return new Promise((resolve) => {
      socket._pendingPromises[eventType].push(resolve);
    });
  }
}

async function initLongPollingSession() {
  const response = await fetch(`${URL}/engine.io/?EIO=4&transport=polling`);