100 lines
3.6 KiB
Markdown
100 lines
3.6 KiB
Markdown
#object.getownpropertydescriptors <sup>[![Version Badge][npm-version-svg]][package-url]</sup>
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[![Build Status][travis-svg]][travis-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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[![browser support][testling-svg]][testling-url]
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An ES2017 spec-compliant shim for `Object.getOwnPropertyDescriptors` that works in ES5.
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Invoke its "shim" method to shim `Object.getOwnPropertyDescriptors` if it is unavailable, and if `Object.getOwnPropertyDescriptor` is available.
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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://github.com/tc39/ecma262/pull/582).
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## Example
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```js
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var getDescriptors = require('object.getownpropertydescriptors');
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var assert = require('assert');
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var obj = { normal: Infinity };
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var enumDescriptor = {
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enumerable: false,
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writable: false,
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configurable: true,
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value: true
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};
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var writableDescriptor = {
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enumerable: true,
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writable: true,
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configurable: true,
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value: 42
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};
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var symbol = Symbol();
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var symDescriptor = {
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enumerable: true,
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writable: true,
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configurable: false,
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value: [symbol]
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};
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Object.defineProperty(obj, 'enumerable', enumDescriptor);
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Object.defineProperty(obj, 'writable', writableDescriptor);
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Object.defineProperty(obj, 'symbol', symDescriptor);
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var descriptors = getDescriptors(obj);
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assert.deepEqual(descriptors, {
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normal: {
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enumerable: true,
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writable: true,
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configurable: true,
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value: Infinity
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},
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enumerable: enumDescriptor,
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writable: writableDescriptor,
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symbol: symDescriptor
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});
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```
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```js
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var getDescriptors = require('object.getownpropertydescriptors');
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var assert = require('assert');
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/* when Object.getOwnPropertyDescriptors is not present */
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delete Object.getOwnPropertyDescriptors;
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var shimmedDescriptors = getDescriptors.shim();
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assert.equal(shimmedDescriptors, getDescriptors);
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assert.deepEqual(shimmedDescriptors(obj), getDescriptors(obj));
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```
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```js
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var getDescriptors = require('object.getownpropertydescriptors');
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var assert = require('assert');
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/* when Object.getOwnPropertyDescriptors is present */
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var shimmedDescriptors = getDescriptors.shim();
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assert.notEqual(shimmedDescriptors, getDescriptors);
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assert.deepEqual(shimmedDescriptors(obj), getDescriptors(obj));
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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/object.getownpropertydescriptors
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[npm-version-svg]: http://versionbadg.es/ljharb/object.getownpropertydescriptors.svg
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[travis-svg]: https://travis-ci.org/ljharb/object.getownpropertydescriptors.svg
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[travis-url]: https://travis-ci.org/ljharb/object.getownpropertydescriptors
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[deps-svg]: https://david-dm.org/ljharb/object.getownpropertydescriptors.svg
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[deps-url]: https://david-dm.org/ljharb/object.getownpropertydescriptors
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[dev-deps-svg]: https://david-dm.org/ljharb/object.getownpropertydescriptors/dev-status.svg
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[dev-deps-url]: https://david-dm.org/ljharb/object.getownpropertydescriptors#info=devDependencies
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[testling-svg]: https://ci.testling.com/ljharb/object.getownpropertydescriptors.png
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[testling-url]: https://ci.testling.com/ljharb/object.getownpropertydescriptors
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[npm-badge-png]: https://nodei.co/npm/object.getownpropertydescriptors.png?downloads=true&stars=true
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[license-image]: http://img.shields.io/npm/l/object.getownpropertydescriptors.svg
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[license-url]: LICENSE
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[downloads-image]: http://img.shields.io/npm/dm/object.getownpropertydescriptors.svg
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[downloads-url]: http://npm-stat.com/charts.html?package=object.getownpropertydescriptors
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