Watch object change

watch.js

var obj = {
  a : 'value',
  b : 'another value'
}

var objProxy = new Proxy(obj, {
  set(target, key, value) {
    console.log({ key, value })
    if (key === 'b') {
      debugger
    }
  }
})

obj = objProxy
obj.a = 'test' // logs `a` as key and `test` as value