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# unbox-primitive <sup>[![Version Badge][2]][1]</sup> [![dependency status][5]][6] [![dev dependency status][7]][8] [![License][license-image]][license-url] [![Downloads][downloads-image]][downloads-url] [![npm badge][11]][1] Unbox a boxed JS primitive value. This module works cross-realm/iframe, does not depend on `instanceof` or mutable properties, and works despite ES6 Symbol.toStringTag. ## Example ```js var unboxPrimitive = require('unbox-primitive'); var assert = require('assert'); assert.equal(unboxPrimitive(new Boolean(false)), false); assert.equal(unboxPrimitive(new String('f')), 'f'); assert.equal(unboxPrimitive(new Number(42)), 42); const s = Symbol(); assert.equal(unboxPrimitive(Object(s)), s); assert.equal(unboxPrimitive(new BigInt(42)), 42n); // any primitive, or non-boxed-primitive object, will throw ``` ## Tests Simply clone the repo, `npm install`, and run `npm test` [1]: https://npmjs.org/package/unbox-primitive [2]: https://versionbadg.es/ljharb/unbox-primitive.svg [5]: https://david-dm.org/ljharb/unbox-primitive.svg [6]: https://david-dm.org/ljharb/unbox-primitive [7]: https://david-dm.org/ljharb/unbox-primitive/dev-status.svg [8]: https://david-dm.org/ljharb/unbox-primitive#info=devDependencies [11]: https://nodei.co/npm/unbox-primitive.png?downloads=true&stars=true [license-image]: https://img.shields.io/npm/l/unbox-primitive.svg [license-url]: LICENSE [downloads-image]: https://img.shields.io/npm/dm/unbox-primitive.svg [downloads-url]: https://npm-stat.com/charts.html?package=unbox-primitive