Proxy

proxied.js

const proxied = target => {
  const handler = {
    get(target, key) {
      if (typeof target[key] === 'function') {
        return function (...args) {
          const result = target[key].apply(this, args)
          console.log('function', key, args, result)
          return result
        }
      }
      console.log('get', key, target[key])
      return target[key]
    },
    set(target, key, value) {
      console.log('set', key, value)
      return target[key] = value
    },
  }
  return new Proxy(target, handler)
}