|                                                                                    |  | # define-properties <sup>[![Version Badge][npm-version-svg]][package-url]</sup>
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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
```jsvar 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:```jsvar 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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