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71 lines
2.7 KiB
71 lines
2.7 KiB
# get-intrinsic <sup>[![Version Badge][npm-version-svg]][package-url]</sup> |
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[![github actions][actions-image]][actions-url] |
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[![coverage][codecov-image]][codecov-url] |
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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]: https://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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[codecov-image]: https://codecov.io/gh/ljharb/get-intrinsic/branch/main/graphs/badge.svg |
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[codecov-url]: https://app.codecov.io/gh/ljharb/get-intrinsic/ |
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[actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/ljharb/get-intrinsic |
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[actions-url]: https://github.com/ljharb/get-intrinsic/actions
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