| 1 | # has-proto <sup>[![Version Badge][npm-version-svg]][package-url]</sup>
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| 2 |
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| 3 | [![github actions][actions-image]][actions-url]
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| 4 | [![coverage][codecov-image]][codecov-url]
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| 5 | [![License][license-image]][license-url]
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| 6 | [![Downloads][downloads-image]][downloads-url]
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| 7 |
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| 8 | [![npm badge][npm-badge-png]][package-url]
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| 9 |
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| 10 | Does this environment have the ability to set the [[Prototype]] of an object on creation with `__proto__`?
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| 11 |
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| 12 | ## Example
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| 13 |
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| 14 | ```js
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| 15 | var hasProto = require('has-proto');
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| 16 | var assert = require('assert');
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| 17 |
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| 18 | assert.equal(typeof hasProto(), 'boolean');
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| 19 |
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| 20 | var hasProtoAccessor = require('has-proto/accessor')();
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| 21 | if (hasProtoAccessor) {
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| 22 | assert.equal([].__proto__, Array.prototype);
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| 23 | } else {
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| 24 | assert(!('__proto__' in Object.prototype));
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| 25 | }
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| 26 |
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| 27 | var hasProtoMutator = require('has-proto/mutator');
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| 28 | var obj = {};
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| 29 | assert('toString' in obj);
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| 30 |
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| 31 | obj.__proto__ = null;
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| 32 | if (hasProtoMutator) {
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| 33 | assert(!('toString' in obj));
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| 34 | } else {
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| 35 | assert('toString' in obj);
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| 36 | assert.equal(obj.__proto__, null);
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| 37 | }
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| 38 | ```
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| 39 |
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| 40 | ## Tests
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| 41 | Simply clone the repo, `npm install`, and run `npm test`
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| 42 |
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| 43 | [package-url]: https://npmjs.org/package/has-proto
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| 44 | [npm-version-svg]: https://versionbadg.es/inspect-js/has-proto.svg
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| 45 | [deps-svg]: https://david-dm.org/inspect-js/has-proto.svg
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| 46 | [deps-url]: https://david-dm.org/inspect-js/has-proto
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| 47 | [dev-deps-svg]: https://david-dm.org/inspect-js/has-proto/dev-status.svg
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| 48 | [dev-deps-url]: https://david-dm.org/inspect-js/has-proto#info=devDependencies
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| 49 | [npm-badge-png]: https://nodei.co/npm/has-proto.png?downloads=true&stars=true
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| 50 | [license-image]: https://img.shields.io/npm/l/has-proto.svg
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| 51 | [license-url]: LICENSE
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| 52 | [downloads-image]: https://img.shields.io/npm/dm/has-proto.svg
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| 53 | [downloads-url]: https://npm-stat.com/charts.html?package=has-proto
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| 54 | [codecov-image]: https://codecov.io/gh/inspect-js/has-proto/branch/main/graphs/badge.svg
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| 55 | [codecov-url]: https://app.codecov.io/gh/inspect-js/has-proto/
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| 56 | [actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/inspect-js/has-proto
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| 57 | [actions-url]: https://github.com/inspect-js/has-proto/actions
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