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define-properties
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Edit File: README.md
# define-properties <sup>[![Version Badge][npm-version-svg]][package-url]</sup> [![github actions][actions-image]][actions-url] [![coverage][codecov-image]][codecov-url] [![dependency status][deps-svg]][deps-url] [![dev dependency status][dev-deps-svg]][dev-deps-url] [![License][license-image]][license-url] [![Downloads][downloads-image]][downloads-url] [![npm badge][npm-badge-png]][package-url] Define multiple non-enumerable properties at once. Uses `Object.defineProperty` when available; falls back to standard assignment in older engines. Existing properties are not overridden. Accepts a map of property names to a predicate that, when true, force-overrides. ## Example ```js var define = require('define-properties'); var assert = require('assert'); var obj = define({ a: 1, b: 2 }, { a: 10, b: 20, c: 30 }); assert(obj.a === 1); assert(obj.b === 2); assert(obj.c === 30); if (define.supportsDescriptors) { assert.deepEqual(Object.keys(obj), ['a', 'b']); assert.deepEqual(Object.getOwnPropertyDescriptor(obj, 'c'), { configurable: true, enumerable: false, value: 30, writable: false }); } ``` Then, with predicates: ```js var define = require('define-properties'); var assert = require('assert'); var obj = define({ a: 1, b: 2, c: 3 }, { a: 10, b: 20, c: 30 }, { a: function () { return false; }, b: function () { return true; } }); assert(obj.a === 1); assert(obj.b === 20); assert(obj.c === 3); if (define.supportsDescriptors) { assert.deepEqual(Object.keys(obj), ['a', 'c']); assert.deepEqual(Object.getOwnPropertyDescriptor(obj, 'b'), { configurable: true, enumerable: false, value: 20, writable: false }); } ``` ## Tests Simply clone the repo, `npm install`, and run `npm test` [package-url]: https://npmjs.org/package/define-properties [npm-version-svg]: https://versionbadg.es/ljharb/define-properties.svg [deps-svg]: https://david-dm.org/ljharb/define-properties.svg [deps-url]: https://david-dm.org/ljharb/define-properties [dev-deps-svg]: https://david-dm.org/ljharb/define-properties/dev-status.svg [dev-deps-url]: https://david-dm.org/ljharb/define-properties#info=devDependencies [npm-badge-png]: https://nodei.co/npm/define-properties.png?downloads=true&stars=true [license-image]: https://img.shields.io/npm/l/define-properties.svg [license-url]: LICENSE [downloads-image]: https://img.shields.io/npm/dm/define-properties.svg [downloads-url]: https://npm-stat.com/charts.html?package=define-properties [codecov-image]: https://codecov.io/gh/ljharb/define-properties/branch/main/graphs/badge.svg [codecov-url]: https://app.codecov.io/gh/ljharb/define-properties/ [actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/ljharb/define-properties [actions-url]: https://github.com/ljharb/define-properties/actions
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