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Showing content from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/Proxy below:

Proxy() constructor - JavaScript | MDN

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The Proxy() constructor creates Proxy objects.

new Proxy(target, handler)

Note: Proxy() can only be constructed with new. Attempting to call it without new throws a TypeError.

target

A target object to wrap with Proxy. It can be any sort of object, including a native array, a function, or even another proxy.

handler

An object whose properties are functions that define the behavior of the proxy when an operation is performed on it.

Use the Proxy() constructor to create a new Proxy object. This constructor takes two mandatory arguments:

• target is the object for which you want to create the proxy
• handler is the object that defines the custom behavior of the proxy.

An empty handler will create a proxy that behaves, in almost all respects, exactly like the target. By defining any of a set group of functions on the handler object, you can customize specific aspects of the proxy's behavior. For example, by defining get() you can provide a customized version of the target's property accessor.

In this example the target has two properties, notProxied and proxied. We define a handler that returns a different value for proxied, and lets any other accesses through to the target.

const target = {
  notProxied: "original value",
  proxied: "original value",
};

const handler = {
  get(target, prop, receiver) {
    if (prop === "proxied") {
      return "replaced value";
    }
    return Reflect.get(...arguments);
  },
};

const proxy = new Proxy(target, handler);

console.log(proxy.notProxied); // "original value"
console.log(proxy.proxied); // "replaced value"

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