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Uses WeakMap if available.","maintainers":[{"name":"ljharb","email":"ljharb@gmail.com"}],"readme":"# side-channel-weakmap <sup>[![Version Badge][npm-version-svg]][package-url]</sup>\n\n[![github actions][actions-image]][actions-url]\n[![coverage][codecov-image]][codecov-url]\n[![License][license-image]][license-url]\n[![Downloads][downloads-image]][downloads-url]\n\n[![npm badge][npm-badge-png]][package-url]\n\nStore information about any JS value in a side channel. Uses WeakMap if available.\n\nWarning: this implementation will leak memory until you `delete` the `key`.\nUse [`side-channel`](https://npmjs.com/side-channel) for the best available strategy.\n\n## Getting started\n\n```sh\nnpm install --save side-channel-weakmap\n```\n\n## Usage/Examples\n\n```js\nconst assert = require('assert');\nconst getSideChannelList = require('side-channel-weakmap');\n\nconst channel = getSideChannelList();\n\nconst key = {};\nassert.equal(channel.has(key), false);\nassert.throws(() => channel.assert(key), TypeError);\n\nchannel.set(key, 42);\n\nchannel.assert(key); // does not throw\nassert.equal(channel.has(key), true);\nassert.equal(channel.get(key), 42);\n\nchannel.delete(key);\nassert.equal(channel.has(key), false);\nassert.throws(() => channel.assert(key), TypeError);\n```\n\n## Tests\n\nClone the repo, `npm install`, and run `npm test`\n\n[package-url]: https://npmjs.org/package/side-channel-weakmap\n[npm-version-svg]: https://versionbadg.es/ljharb/side-channel-weakmap.svg\n[deps-svg]: https://david-dm.org/ljharb/side-channel-weakmap.svg\n[deps-url]: https://david-dm.org/ljharb/side-channel-weakmap\n[dev-deps-svg]: https://david-dm.org/ljharb/side-channel-weakmap/dev-status.svg\n[dev-deps-url]: https://david-dm.org/ljharb/side-channel-weakmap#info=devDependencies\n[npm-badge-png]: https://nodei.co/npm/side-channel-weakmap.png?downloads=true&stars=true\n[license-image]: https://img.shields.io/npm/l/side-channel-weakmap.svg\n[license-url]: LICENSE\n[downloads-image]: https://img.shields.io/npm/dm/side-channel-weakmap.svg\n[downloads-url]: https://npm-stat.com/charts.html?package=side-channel-weakmap\n[codecov-image]: https://codecov.io/gh/ljharb/side-channel-weakmap/branch/main/graphs/badge.svg\n[codecov-url]: https://app.codecov.io/gh/ljharb/side-channel-weakmap/\n[actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/ljharb/side-channel-weakmap\n[actions-url]: https://github.com/ljharb/side-channel-weakmap/actions\n","readmeFilename":"README.md"}