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# get-intrinsic <sup>[![Version Badge][npm-version-svg]][package-url]</sup>
[![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]
Get and robustly cache all JS language-level intrinsics at first require time.
See the syntax described [in the JS spec](https://tc39.es/ecma262/#sec-well-known-intrinsic-objects) for reference.
## Example
```js var GetIntrinsic = require('get-intrinsic'); var assert = require('assert');
// static methods assert.equal(GetIntrinsic('%Math.pow%'), Math.pow); assert.equal(Math.pow(2, 3), 8); assert.equal(GetIntrinsic('%Math.pow%')(2, 3), 8); delete Math.pow; assert.equal(GetIntrinsic('%Math.pow%')(2, 3), 8);
// instance methods var arr = [1]; assert.equal(GetIntrinsic('%Array.prototype.push%'), Array.prototype.push); assert.deepEqual(arr, [1]);
arr.push(2); assert.deepEqual(arr, [1, 2]);
GetIntrinsic('%Array.prototype.push%').call(arr, 3); assert.deepEqual(arr, [1, 2, 3]);
delete Array.prototype.push; GetIntrinsic('%Array.prototype.push%').call(arr, 4); assert.deepEqual(arr, [1, 2, 3, 4]);
// missing features delete JSON.parse; // to simulate a real intrinsic that is missing in the environment assert.throws(() => GetIntrinsic('%JSON.parse%')); assert.equal(undefined, GetIntrinsic('%JSON.parse%', true)); ```
## Tests
Simply clone the repo, `npm install`, and run `npm test`
## Security
Please email [@ljharb](https://github.com/ljharb) or see https://tidelift.com/security if you have a potential security vulnerability to report.
[package-url]: https://npmjs.org/package/get-intrinsic [npm-version-svg]: http://versionbadg.es/ljharb/get-intrinsic.svg [deps-svg]: https://david-dm.org/ljharb/get-intrinsic.svg [deps-url]: https://david-dm.org/ljharb/get-intrinsic [dev-deps-svg]: https://david-dm.org/ljharb/get-intrinsic/dev-status.svg [dev-deps-url]: https://david-dm.org/ljharb/get-intrinsic#info=devDependencies [npm-badge-png]: https://nodei.co/npm/get-intrinsic.png?downloads=true&stars=true [license-image]: https://img.shields.io/npm/l/get-intrinsic.svg [license-url]: LICENSE [downloads-image]: https://img.shields.io/npm/dm/get-intrinsic.svg [downloads-url]: https://npm-stat.com/charts.html?package=get-intrinsic
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