如何冻结/停止 JavaScript 执行，直到 function 完成

Question

I want to know how can I freeze/stop JavaScript execution until a function is finished (Using JavaScript/NodeJS). For example:

The first line of code in the console shows an alert to the use, JavaScript execution is frozen/stopped until the user clicks ok .

And when that is done the second line of code will continue to execute

Now, I know that I should use async functions to do that, but that isn't working, here's my node code that is loaded in a preload script of a webview in Electron :

global.alert = async (text) => {
  //replace it with custom alert!
  ipcRenderer.sendToHost('ShowAnAlert', {
    theWebsiteLink: location.href,
    theMessage: text
  });
  var a = await function(){
    return new Promise(resolve => {
      ipcRenderer.on('GetResult', () => {
        console.log("Done!");
        resolve("result");
      });
    });
  }();
  return a;
}

But it doesn't freeze/stop JavaScript execution when it's preformed. How can I fix that?

EDIT 1: Ok, turns out that asynchronous isn't the answer that I'm looking for.

global.alert = (text) => {
  //replace it with custom alert!
  ipcRenderer.sendToHost('ShowAnAlert', {
    theWebsiteLink: location.href,
    theMessage: text
  });
  var a = ipcRenderer.on('GetResult', () => {
    console.log("Done!");
  });
  return a;//this is returned as undefined
}

I've removed asynchronous parts in the script. But the function isn't freezing/stopping JavaScript execution. Any idea how can I do this?

EDIT 2: If this isn't possible to do in pure JavaScript, is there some other ways to do this using Electron native functions or Electron Libraries/modules

Answer 1

An async function, by definition, is asynchronous and does not stop the execution of the script. If you wanted it to stop the execution, you'd need to remove the asynchronous parts of it (the Promise, async & await).

The part

var a = ipcRenderer.on('GetResult', () => {
    console.log("Done!");
  });

is an event listener so it will wait for the "GetResult" event before running the console.log within it. This will also return undefined, hence why a is undefined.