`array.push` will not trigger "set" method of proxy

array-push-with-proxy-set.ts

/*  This example is to show that
 *  array.push will not trigger "set" method of proxy
 *  because array is mutable.
 */

interface MyObj {
  arr: number[];
}
const myObj: MyObj = { arr: [] };

const oa = new Proxy(myObj, {
  get(target, prop: keyof MyObj) {
    const ar = target[prop];
    if (Array.isArray(ar) && ar.length === 0) {
      throw Error('empty array');
    }
    return ar;
  },
  set(target, prop: keyof MyObj, value) {
    target[prop] = value;
    console.log('pushed value : ', value); // DEV_LOG_TO_REMOVE
    return true;
  },
});

oa.arr.push(5);
oa.arr.push(2);
console.log('oa : ', oa); // DEV_LOG_TO_REMOVE

Run it on TS Playground