no-proto
Disallow the use of the __proto__ property
__proto__ property has been deprecated as of ECMAScript 3.1 and shouldn’t be used in the code. Use Object.getPrototypeOf and Object.setPrototypeOf instead.
Rule Details
When an object is created with the new operator, __proto__ is set to the original “prototype” property of the object’s constructor function. Object.getPrototypeOf is the preferred method of getting the object’s prototype. To change an object’s prototype, use Object.setPrototypeOf.
Examples of incorrect code for this rule:
Open in Playground
/*eslint no-proto: "error"*/
var a = obj.__proto__;
var a = obj["__proto__"];
obj.__proto__ = b;
obj["__proto__"] = b;
Examples of correct code for this rule:
Open in Playground
/*eslint no-proto: "error"*/
var a = Object.getPrototypeOf(obj);
Object.setPrototypeOf(obj, b);
var c = { __proto__: a };
When Not To Use It
You might want to turn this rule off if you need to support legacy browsers which implement the
__proto__ property but not Object.getPrototypeOf or Object.setPrototypeOf.
Version
This rule was introduced in ESLint v0.0.9.
Further Reading