trace-proxy.js

(() => {
const isObject = t => {
  const z = typeof t
  return t != null && (z === 'object' || z === 'function')
}

const traceProxy = (target, name = 'object', recursive = false) => new Proxy(target, {
  get: (target, prop, receiver) => {
    const res = Reflect.get(target, prop, receiver)
    console.log('get prop:', name, prop, '==', res)
    return recursive && isObject(res) ? traceProxy(res, `${name}[${JSON.stringify(prop)}]`, true) : res
  },
  apply: (target, that, args) => {
    const res = Reflect.apply(target, that, args)
    console.log('apply:', that, args, '==', res)
    return recursive && isObject(res) ? traceProxy(res, `${name}(...${args.length} args)`, true) : res
  }
})

return traceProxy
})()