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