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56 lines
2.0 KiB
Markdown
56 lines
2.0 KiB
Markdown
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# internal-slot <sup>[![Version Badge][npm-version-svg]][package-url]</sup>
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[![Build Status][travis-svg]][travis-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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Truly private storage, akin to the JS spec’s concept of internal slots.
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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.
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## Example
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```js
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var SLOT = require('internal-slot');
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var assert = require('assert');
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var o = {};
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assert.throws(function () { SLOT.assert(o, 'foo'); });
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assert.equal(SLOT.has(o, 'foo'), false);
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assert.equal(SLOT.get(o, 'foo'), undefined);
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SLOT.set(o, 'foo', 42);
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assert.equal(SLOT.has(o, 'foo'), true);
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assert.equal(SLOT.get(o, 'foo'), 42);
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assert.doesNotThrow(function () { SLOT.assert(o, 'foo'); });
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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/internal-slot
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[npm-version-svg]: http://versionbadg.es/ljharb/internal-slot.svg
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[travis-svg]: https://travis-ci.org/ljharb/internal-slot.svg
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[travis-url]: https://travis-ci.org/ljharb/internal-slot
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[deps-svg]: https://david-dm.org/ljharb/internal-slot.svg
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[deps-url]: https://david-dm.org/ljharb/internal-slot
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[dev-deps-svg]: https://david-dm.org/ljharb/internal-slot/dev-status.svg
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[dev-deps-url]: https://david-dm.org/ljharb/internal-slot#info=devDependencies
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[npm-badge-png]: https://nodei.co/npm/internal-slot.png?downloads=true&stars=true
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[license-image]: https://img.shields.io/npm/l/internal-slot.svg
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[license-url]: LICENSE
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[downloads-image]: https://img.shields.io/npm/dm/internal-slot.svg
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[downloads-url]: https://npm-stat.com/charts.html?package=internal-slot
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