78 lines
3.7 KiB
Plaintext
78 lines
3.7 KiB
Plaintext
# reflect.getprototypeof <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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[![dependency status][deps-svg]][deps-url]
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[![dev dependency status][dev-deps-svg]][dev-deps-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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An ES2015 mostly-spec-compliant `Reflect.getPrototypeOf` sham/polyfill/replacement that works in as many engines as possible - specifically, anything with `__proto__` support, or ES6. Built-in types will also work correctly in older engines.
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This package implements the [es-shim API](https://github.com/es-shims/api) interface. It works in an ES3-supported environment and complies with the [spec](https://www.ecma-international.org/ecma-262/5.1/).
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## Example
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```js
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var getPrototypeOf = require('reflect.getprototypeof');
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var assert = require('assert');
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assert.throws(() => getPrototypeOf(true));
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assert.throws(() => getPrototypeOf(42));
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assert.throws(() => getPrototypeOf(''));
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assert.equal(getPrototypeOf(/a/g), RegExp.prototype);
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assert.equal(getPrototypeOf(new Date()), Date.prototype);
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assert.equal(getPrototypeOf(function () {}), Function.prototype);
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assert.equal(getPrototypeOf([]), Array.prototype);
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assert.equal(getPrototypeOf({}), Object.prototype);
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```
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```js
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var getPrototypeOf = require('reflect.getprototypeof');
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var assert = require('assert');
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/* when Reflect or Reflect.getPrototypeOf is not present */
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if (typeof Reflect === 'object') { delete Reflect.getPrototypeOf; }
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delete globalThis.Reflect;
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var shimmed = getPrototypeOf.shim();
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assert.equal(shimmed, getPrototypeOf.getPolyfill());
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assert.throws(() => Reflect.getPrototypeOf(true));
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assert.throws(() => Reflect.getPrototypeOf(42));
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assert.throws(() => Reflect.getPrototypeOf(''));
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assert.equal(Reflect.getPrototypeOf(/a/g), RegExp.prototype);
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assert.equal(Reflect.getPrototypeOf(new Date()), Date.prototype);
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assert.equal(Reflect.getPrototypeOf(function () {}), Function.prototype);
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assert.equal(Reflect.getPrototypeOf([]), Array.prototype);
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assert.equal(Reflect.getPrototypeOf({}), Object.prototype);
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```
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```js
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var getPrototypeOf = require('reflect.getprototypeof');
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var assert = require('assert');
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/* when Reflect.getPrototypeOf is present */
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var shimmedGetPrototypeOf = getPrototypeOf.shim();
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assert.equal(shimmedGetPrototypeOf, Reflect.getPrototypeOf);
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assert.equal(Reflect.getPrototypeOf([]), Array.prototype);
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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/reflect.getprototypeof
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[npm-version-svg]: https://versionbadg.es/es-shims/Reflect.getPrototypeOf.svg
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[deps-svg]: https://david-dm.org/es-shims/Reflect.getPrototypeOf.svg
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[deps-url]: https://david-dm.org/es-shims/Reflect.getPrototypeOf
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[dev-deps-svg]: https://david-dm.org/es-shims/Reflect.getPrototypeOf/dev-status.svg
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[dev-deps-url]: https://david-dm.org/es-shims/Reflect.getPrototypeOf#info=devDependencies
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[npm-badge-png]: https://nodei.co/npm/reflect.getprototypeof.png?downloads=true&stars=true
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[license-image]: https://img.shields.io/npm/l/reflect.getprototypeof.svg
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[license-url]: LICENSE
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[downloads-image]: https://img.shields.io/npm/dm/reflect.getprototypeof.svg
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[downloads-url]: https://npm-stat.com/charts.html?package=reflect.getprototypeof
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[codecov-image]: https://codecov.io/gh/es-shims/Reflect.getPrototypeOf/branch/main/graphs/badge.svg
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[codecov-url]: https://app.codecov.io/gh/es-shims/Reflect.getPrototypeOf/
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[actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/es-shims/Reflect.getPrototypeOf
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[actions-url]: https://github.com/es-shims/Reflect.getPrototypeOf/actions
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