Allows passing a callback serially between two systems

serial-callbacks.js

var seed = 0;
var callbacks = new Map();

function registerCallback (cb) {
  if (callbacks.has(cb)) {
    return callbacks.get(cb)
  }
  var id = ++seed;

  callbacks.set(cb, id)
  callbacks.set(id, cb)
  return id;
}

function createSerialCallback (cbId) {
  return (...args) => {
    var cb = callbacks.get(cbId)
    if (cb) {
      cb(...args)
    }
  }
}

function test (...args) {
  console.log('callback called with', ...args)
}

const callbackRef = registerCallback(test)
const serialCallback = createSerialCallback(callbackRef)

serialCallback('hello', 123, 'world')

Output: callback called with hello 123 world