| 1 | # get-intrinsic <sup>[![Version Badge][npm-version-svg]][package-url]</sup>
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| 2 |
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| 3 | [![dependency status][deps-svg]][deps-url]
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| 4 | [![dev dependency status][dev-deps-svg]][dev-deps-url]
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| 5 | [![License][license-image]][license-url]
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| 6 | [![Downloads][downloads-image]][downloads-url]
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| 7 |
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| 8 | [![npm badge][npm-badge-png]][package-url]
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| 9 |
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| 10 | Get and robustly cache all JS language-level intrinsics at first require time.
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| 11 |
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| 12 | See the syntax described [in the JS spec](https://tc39.es/ecma262/#sec-well-known-intrinsic-objects) for reference.
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| 13 |
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| 14 | ## Example
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| 15 |
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| 16 | ```js
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| 17 | var GetIntrinsic = require('get-intrinsic');
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| 18 | var assert = require('assert');
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| 19 |
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| 20 | // static methods
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| 21 | assert.equal(GetIntrinsic('%Math.pow%'), Math.pow);
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| 22 | assert.equal(Math.pow(2, 3), 8);
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| 23 | assert.equal(GetIntrinsic('%Math.pow%')(2, 3), 8);
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| 24 | delete Math.pow;
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| 25 | assert.equal(GetIntrinsic('%Math.pow%')(2, 3), 8);
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| 26 |
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| 27 | // instance methods
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| 28 | var arr = [1];
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| 29 | assert.equal(GetIntrinsic('%Array.prototype.push%'), Array.prototype.push);
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| 30 | assert.deepEqual(arr, [1]);
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| 31 |
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| 32 | arr.push(2);
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| 33 | assert.deepEqual(arr, [1, 2]);
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| 34 |
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| 35 | GetIntrinsic('%Array.prototype.push%').call(arr, 3);
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| 36 | assert.deepEqual(arr, [1, 2, 3]);
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| 37 |
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| 38 | delete Array.prototype.push;
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| 39 | GetIntrinsic('%Array.prototype.push%').call(arr, 4);
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| 40 | assert.deepEqual(arr, [1, 2, 3, 4]);
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| 41 |
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| 42 | // missing features
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| 43 | delete JSON.parse; // to simulate a real intrinsic that is missing in the environment
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| 44 | assert.throws(() => GetIntrinsic('%JSON.parse%'));
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| 45 | assert.equal(undefined, GetIntrinsic('%JSON.parse%', true));
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| 46 | ```
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| 47 |
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| 48 | ## Tests
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| 49 | Simply clone the repo, `npm install`, and run `npm test`
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| 50 |
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| 51 | ## Security
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| 52 |
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| 53 | Please email [@ljharb](https://github.com/ljharb) or see https://tidelift.com/security if you have a potential security vulnerability to report.
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| 54 |
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| 55 | [package-url]: https://npmjs.org/package/get-intrinsic
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| 56 | [npm-version-svg]: http://versionbadg.es/ljharb/get-intrinsic.svg
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| 57 | [deps-svg]: https://david-dm.org/ljharb/get-intrinsic.svg
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| 58 | [deps-url]: https://david-dm.org/ljharb/get-intrinsic
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| 59 | [dev-deps-svg]: https://david-dm.org/ljharb/get-intrinsic/dev-status.svg
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| 60 | [dev-deps-url]: https://david-dm.org/ljharb/get-intrinsic#info=devDependencies
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| 61 | [npm-badge-png]: https://nodei.co/npm/get-intrinsic.png?downloads=true&stars=true
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| 62 | [license-image]: https://img.shields.io/npm/l/get-intrinsic.svg
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| 63 | [license-url]: LICENSE
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| 64 | [downloads-image]: https://img.shields.io/npm/dm/get-intrinsic.svg
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| 65 | [downloads-url]: https://npm-stat.com/charts.html?package=get-intrinsic
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