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has-proto (1.2.0)

Published 2026-02-24 13:57:35 +00:00 by atheaadmin

Installation

Setup this registry in your project .npmrc file:

registry=

To install the package using npm, run the following command:

npm install has-proto@1.2.0

or add it to the package.json file:

"has-proto": "1.2.0"

For more information on the npm registry, see the documentation.

About this package

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

Dependencies

Dependencies

ID	Version
dunder-proto	^1.0.0

Development Dependencies

ID	Version
@arethetypeswrong/cli	^0.17.0
@ljharb/eslint-config	^21.1.1
@ljharb/tsconfig	^0.2.2
@types/gopd	^1.0.3
@types/tape	^5.6.5
auto-changelog	^2.5.0
encoding	^0.1.13
eslint	=8.8.0
evalmd	^0.0.19
gopd	^1.2.0
in-publish	^2.0.1
npmignore	^0.3.1
reflect.getprototypeof	^1.0.7
safe-publish-latest	^2.0.0
tape	^5.9.0
typescript	next

Keywords

prototype proto set get __proto__ getPrototypeOf setPrototypeOf has

Details

npm

2026-02-24 13:57:35 +00:00

1

Jordan Harband

Project Site

MIT

latest

5.3 KiB

Assets (1)

has-proto-1.2.0.tgz 5.3 KiB

Versions (1) View all

1.2.0 2026-02-24