has-proto

has-proto

Does this environment have the ability to set the [[Prototype]] of an object on creation with __proto__?

Example

var hasProto = require('has-proto');
var assert = require('assert');

assert.equal(typeof hasProto(), 'boolean');

var hasProtoAccessor = require('has-proto/accessor')();
if (hasProtoAccessor) {
	assert.equal([].__proto__, Array.prototype);
} else {
	assert(!('__proto__' in Object.prototype));
}

var hasProtoMutator = require('has-proto/mutator');
var obj = {};
assert('toString' in obj);

obj.__proto__ = null;
if (hasProtoMutator) {
	assert(!('toString' in obj));
} else {
	assert('toString' in obj);
	assert.equal(obj.__proto__, null);
}

Tests

Simply clone the repo, npm install, and run npm test

Changelog

v1.2.0 - 2024-12-06

Commits

• [Refactor] use dunder-proto instead of call-bind 6e5e76c
• [actions] split out node 10-20, and 20+ 3b8e9e6
• [Dev Deps] update @ljharb/tsconfig, gopd 57bcd00
• [actions] skip npm ls in node < 10 ce3a4d7