06-doc-set.js

/* PROXY */

const handleSet = (obj, prop, value) => {
  if (prop === "content" && value.length > 0 && value.length < 255) {
    const { content, lastUpdated, history = [] } = obj;
    const historyUpdated = [...history, { content, lastUpdated }];

    if (content && lastUpdated) {
      Reflect.set(obj, "history", historyUpdated);
    }
    Reflect.set(obj, prop, value);
    Reflect.set(obj, "lastUpdated", Date.now());

    return true;
  }

  console.error(
    "Content length should not be empty and be less than 255 characters"
  );

  return false;
};

const createDocProxy = (doc) => {
  return new Proxy(doc, {
    set: handleSet
  });
};

/* INITIALIZE */

const doc = createDocProxy({
  content: "",
  lastUpdated: Date.now()
});