58 lines
2 KiB
Markdown
58 lines
2 KiB
Markdown
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# has-proto <sup>[![Version Badge][npm-version-svg]][package-url]</sup>
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[![github actions][actions-image]][actions-url]
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[![coverage][codecov-image]][codecov-url]
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[![License][license-image]][license-url]
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[![Downloads][downloads-image]][downloads-url]
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[![npm badge][npm-badge-png]][package-url]
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Does this environment have the ability to set the [[Prototype]] of an object on creation with `__proto__`?
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## Example
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```js
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var hasProto = require('has-proto');
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var assert = require('assert');
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assert.equal(typeof hasProto(), 'boolean');
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var hasProtoAccessor = require('has-proto/accessor')();
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if (hasProtoAccessor) {
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assert.equal([].__proto__, Array.prototype);
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} else {
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assert(!('__proto__' in Object.prototype));
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}
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var hasProtoMutator = require('has-proto/mutator');
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var obj = {};
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assert('toString' in obj);
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obj.__proto__ = null;
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if (hasProtoMutator) {
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assert(!('toString' in obj));
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} else {
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assert('toString' in obj);
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assert.equal(obj.__proto__, null);
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}
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```
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## Tests
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Simply clone the repo, `npm install`, and run `npm test`
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[package-url]: https://npmjs.org/package/has-proto
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[npm-version-svg]: https://versionbadg.es/inspect-js/has-proto.svg
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[deps-svg]: https://david-dm.org/inspect-js/has-proto.svg
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[deps-url]: https://david-dm.org/inspect-js/has-proto
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[dev-deps-svg]: https://david-dm.org/inspect-js/has-proto/dev-status.svg
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[dev-deps-url]: https://david-dm.org/inspect-js/has-proto#info=devDependencies
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[npm-badge-png]: https://nodei.co/npm/has-proto.png?downloads=true&stars=true
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[license-image]: https://img.shields.io/npm/l/has-proto.svg
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[license-url]: LICENSE
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[downloads-image]: https://img.shields.io/npm/dm/has-proto.svg
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[downloads-url]: https://npm-stat.com/charts.html?package=has-proto
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[codecov-image]: https://codecov.io/gh/inspect-js/has-proto/branch/main/graphs/badge.svg
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[codecov-url]: https://app.codecov.io/gh/inspect-js/has-proto/
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[actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/inspect-js/has-proto
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[actions-url]: https://github.com/inspect-js/has-proto/actions
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