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internal-slot

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internal-slot

ES spec-like internal slots


Version published
Weekly downloads
26M
decreased by-18.89%
Maintainers
1
Install size
357 kB
Created
Weekly downloads
 

Changelog

Source

v1.0.7

5 February 2024

  • [Dev Deps] update aud, npmignore, tape 89c88c1
  • [Refactor] use es-errors, so things that only need those do not need get-intrinsic b437631

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Source

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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.

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Package last updated on 06 Feb 2024

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