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62 lines
2.3 KiB
62 lines
2.3 KiB
# side-channel-weakmap <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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[![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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Store information about any JS value in a side channel. Uses WeakMap if available. |
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Warning: this implementation will leak memory until you `delete` the `key`. |
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Use [`side-channel`](https://npmjs.com/side-channel) for the best available strategy. |
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## Getting started |
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```sh |
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npm install --save side-channel-weakmap |
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``` |
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## Usage/Examples |
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```js |
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const assert = require('assert'); |
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const getSideChannelList = require('side-channel-weakmap'); |
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const channel = getSideChannelList(); |
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const key = {}; |
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assert.equal(channel.has(key), false); |
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assert.throws(() => channel.assert(key), TypeError); |
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channel.set(key, 42); |
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channel.assert(key); // does not throw |
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assert.equal(channel.has(key), true); |
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assert.equal(channel.get(key), 42); |
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channel.delete(key); |
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assert.equal(channel.has(key), false); |
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assert.throws(() => channel.assert(key), TypeError); |
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``` |
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## Tests |
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Clone the repo, `npm install`, and run `npm test` |
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[package-url]: https://npmjs.org/package/side-channel-weakmap |
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[npm-version-svg]: https://versionbadg.es/ljharb/side-channel-weakmap.svg |
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[deps-svg]: https://david-dm.org/ljharb/side-channel-weakmap.svg |
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[deps-url]: https://david-dm.org/ljharb/side-channel-weakmap |
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[dev-deps-svg]: https://david-dm.org/ljharb/side-channel-weakmap/dev-status.svg |
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[dev-deps-url]: https://david-dm.org/ljharb/side-channel-weakmap#info=devDependencies |
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[npm-badge-png]: https://nodei.co/npm/side-channel-weakmap.png?downloads=true&stars=true |
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[license-image]: https://img.shields.io/npm/l/side-channel-weakmap.svg |
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[license-url]: LICENSE |
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[downloads-image]: https://img.shields.io/npm/dm/side-channel-weakmap.svg |
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[downloads-url]: https://npm-stat.com/charts.html?package=side-channel-weakmap |
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[codecov-image]: https://codecov.io/gh/ljharb/side-channel-weakmap/branch/main/graphs/badge.svg |
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[codecov-url]: https://app.codecov.io/gh/ljharb/side-channel-weakmap/ |
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[actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/ljharb/side-channel-weakmap |
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[actions-url]: https://github.com/ljharb/side-channel-weakmap/actions
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