chrome.runtime.onMessage response with async await

Question

I want to use async await in an onMessage listener:

chrome.runtime.onMessage.addListener(async (request, sender, sendResponse) =>{
    var key = await getKey(         


        

Answer 1

I do work-around by extracting to an async function.

chrome.runtime.onMessage.addListener((request, sender, sendResponse) => {
  doSomethingWith(request).then(sendResponse);
  return true; // return true to indicate you want to send a response asynchronously
});

async function doSomethingWith(request) {
  var key = await getKey();
  // await .....
  return key;
}

The return value of an async function is implicitly wrapped in Promise.resolve. See async doc.

See onMessage.