JS Proxy Example

facility.progress = new Proxy(facility.progress, {
      get: (target, prop) => Reflect.get(target, prop),
      set: (target, prop, value) => {
        Reflect.set(target, prop, value)
      },
			apply:(target, thisArg, argumentList){
			}
    })

JS Proxy & Promise can make await property

async function parseValue() {
  await new Promise(resolve => setImmediate(resolve));
  return "parsed value"
}
let proxy = new Proxy(myObject, {
  get(target, prop, receiver) {
    if (prop === "attribute") {
      let newProp = prop + "_parsed"
      if (!(newProp in target)) {
        target[newProp] = parseValue()
      }
      return target[newProp]
    } else {
      return Reflect.get(target, prop, receiver)
    }
  },
})
await proxy.attribute

nested proxy

const coors: number[][] = [[]]
  const handler: ProxyHandler<number[] & number[][]> = {
    get(target, prop) {
      console.log('get', target, prop)
      if (target instanceof Array) return new Proxy(Reflect.get(target, prop), handler)
      else return Reflect.get(target, prop)
    },
    set(target, prop, value) {
      console.log('set', target, prop, value)
      return Reflect.set(target, prop, value)
    },
  }
  const proxy = new Proxy(coors, handler)

  console.log(proxy)
  proxy[1] = [1, 2]
  console.log(proxy)
  proxy[0][1] = 3
  console.log(proxy)