Chapter 11 - Can't get code to work after several hours of trying

[PolarisTLX]

I am going through Chapter 11 - Asynchronous Programming from the 3rd Edition, again to try and better understand it. To do so I have been trying to actually get the code to run with the examples provided, but I have spent many hours yet nothing works right from:

import {bigOak} from "./crow-tech";

bigOak.readStorage("food caches", caches => {
  let firstCache = caches[0];
  bigOak.readStorage(firstCache, info => {
    console.log(info);
  });
});

First it is the curly brace " { " from import {bigOak} from "./crow-tech"; that the console in the browser does not like.

I also got the file crow-tech.js from the sandbox. But I kept getting that error.

So then I start applying all of my knowledge of JavaScript, including trying to get this working with setting up the project folder with:

• npm init -y
• package.json
• webpack + webpack-cli + webpack.config.js
• npm run build

This finally removes that error about the curly brace " { " .

But I keep getting several others due to the order of how the variables and constants ant functions are defined in the file crow-tech.js.
I re-arrange all the variables till it stops complaining about them,

But then get this message: Uncaught TypeError: Illegal constructor on

this.nodes[name] = new Node(name, reachable[name], this, storageFor(name))

How is this solved? Was the code in this chapter ever supposed to be able to be run on one's machine?

Help / clarification on getting this code to run, or if it even CAN be run would be much appreciated.

[marijnh]

Hi. The chances of getting this code to run in the browser console are pretty slim — you can't do import there.

Node similarly does not support import natively, but if you go to http://eloquentjavascript.net/code/#11 and download both of the files linked there into a directory, you'll be able to run 11_async.js with node. You could edit the file, adding code at the bottom, try things out (though note that you may need to introduce a delay if your code requires the routing information being available—propagating that between the nests takes a moment)