no-proto.md

Pattern: Use of __proto__ property

Issue: -

Description

The __proto__ property is deprecated since ECMAScript 3.1. Modern code should use Object.getPrototypeOf() and Object.setPrototypeOf() instead for accessing and setting an object's prototype.

Examples

Example of incorrect code:

const parent = {};
const child = {};

const proto = obj.__proto__;
obj.__proto__ = parent;

const otherProto = obj["__proto__"];
obj["__proto__"] = child;

Example of correct code:

const parent = {};
const child = {};

const proto = Object.getPrototypeOf(obj);
Object.setPrototypeOf(obj, parent);

// Create object with specific prototype
const newObj = Object.create(parent);