Learn ECMAScript - Second Edition

The defineProperty(target, property, descriptor) method

The defineProperty trap is executed when we define a property using the Object.defineProperty() method. It takes three parameters--that is, the target object, the property name, and the descriptor object.

This trap should return a Boolean indicating whether it has successfully defined the property or not.

Here is a code example that demonstrates how to use the defineProperty trap:

const proxy = new Proxy({}, { defineProperty(target, property, descriptor) {     Object.defineProperty(target, property, descriptor);     return true; } }); Reflect.defineProperty(proxy, "name", {value: "Eden"}); console.log(proxy.name); //Output "Eden"