Mutation detection via proxy example

proxy-mutation-obj.js

function wrap(obj) {
  return new Proxy(obj, {
    set: (target, property, value, receiver) => {
      if (target[property] !== value) {
        console.warn("MUTATION DETECTED!");
      }
      // Perform the normal set()
      target[property] = value;
      return true;
    },
  });
}

const obj = {};
const wrappedObj = wrap(obj);
wrappedObj.value = 'oops'; // console should log "MUTATION DETECTED!"