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internal-slot

1.0.2 • Public • Published

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Truly private storage, akin to the JS spec’s concept of internal slots.

Uses a WeakMap when available; a Map when not; and a regular object in even older engines. Performance and garbage collection behavior will reflect the environment’s capabilities accordingly.

Example

var SLOT = require('internal-slot');
var assert = require('assert');
 
var o = {};
 
assert.throws(function () { SLOT.assert(o, 'foo'); });
 
assert.equal(SLOT.has(o, 'foo'), false);
assert.equal(SLOT.get(o, 'foo'), undefined);
 
SLOT.set(o, 'foo', 42);
 
assert.equal(SLOT.has(o, 'foo'), true);
assert.equal(SLOT.get(o, 'foo'), 42);
 
assert.doesNotThrow(function () { SLOT.assert(o, 'foo'); });

Tests

Simply clone the repo, npm install, and run npm test

Security

Please email @ljharb or see https://tidelift.com/security if you have a potential security vulnerability to report.

Install

npm i internal-slot

DownloadsWeekly Downloads

2,439,064

Version

1.0.2

License

MIT

Unpacked Size

22.2 kB

Total Files

10

Last publish

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