https://github.com/ljharb/get-intrinsic

Get and robustly cache all JS language-level intrinsics at first require time.
https://github.com/ljharb/get-intrinsic

builtin builtins ecmascript intrinsic intrinsics javascript primordial primordials

Last synced: about 7 hours ago
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Get and robustly cache all JS language-level intrinsics at first require time.

• Host: GitHub
• URL: https://github.com/ljharb/get-intrinsic
• Owner: ljharb
• License: mit
• Created: 2020-10-30T03:37:22.000Z (about 4 years ago)
• Default Branch: main
• Last Pushed: 2025-01-02T17:54:41.000Z (20 days ago)
• Last Synced: 2025-01-15T04:34:55.022Z (7 days ago)
• Topics: builtin, builtins, ecmascript, intrinsic, intrinsics, javascript, primordial, primordials
• Language: JavaScript
• Homepage:
• Size: 211 KB
• Stars: 26
• Watchers: 3
• Forks: 4
• Open Issues: 3
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • Funding: .github/FUNDING.yml
  • License: LICENSE

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README

        
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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.

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