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Status](https://travis-ci.org/kaelzhang/graceful-instanceof.svg?branch=master)](https://travis-ci.org/kaelzhang/graceful-instanceof)\n[![Coverage](https://codecov.io/gh/kaelzhang/graceful-instanceof/branch/master/graph/badge.svg)](https://codecov.io/gh/kaelzhang/graceful-instanceof)\n\u003c!-- optional appveyor tst\n[![Windows Build Status](https://ci.appveyor.com/api/projects/status/github/kaelzhang/graceful-instanceof?branch=master\u0026svg=true)](https://ci.appveyor.com/project/kaelzhang/graceful-instanceof)\n--\u003e\n\u003c!-- optional npm version\n[![NPM version](https://badge.fury.io/js/graceful-instanceof.svg)](http://badge.fury.io/js/graceful-instanceof)\n--\u003e\n\u003c!-- optional npm downloads\n[![npm module downloads per month](http://img.shields.io/npm/dm/graceful-instanceof.svg)](https://www.npmjs.org/package/graceful-instanceof)\n--\u003e\n\u003c!-- optional dependency status\n[![Dependency Status](https://david-dm.org/kaelzhang/graceful-instanceof.svg)](https://david-dm.org/kaelzhang/graceful-instanceof)\n--\u003e\n\n# graceful-instanceof\n\nThe instanceof mechanism cross package versions.\n\n## Why?\n\n```js\nexport default class MyClass {\n  constructor (options) {\n    if (this instanceof MyClass) {\n      return options\n    }\n\n    // do something with options\n  }\n}\n```\n\nWe intend to do something like this:\n\n```js\nconst instance = new MyClass(options)\n\ninstance === new MyClass(instance)  // true\n```\n\nBut what happens if the `instance` is came from another version of the module?\n\n```\nabc.js\nnode_modules\n  |-- foo # version 1.0.0\n        |-- index.js # which export default MyClass\n  |-- bar\n        |-- node_modules # version 1.1.0\n        |     |-- foo\n        |           |-- index.js # also exports MyClass\n        |-- index.js # which exports default the instance of MyClass\n```\n\nAnd in abc.js\n\n```js\nimport bar from 'bar'\nimport MyClass from 'foo'\n\nbar === new MyClass(bar)  // FALSE!!\n\n// Something BOOOOOOOOOOM !!!\n```\n\n## Install\n\n```sh\n$ npm install graceful-instanceof\n```\n\n## Usage\n\n```js\nimport instanceOf from 'graceful-instanceof'\n\nconst type = instanceOf('foo:MyClass')\n\nclass MyClass {\n  constructor (options) {\n    if (type.is(options)) {\n      return options\n    }\n\n    type.attach(this)\n  }\n}\n\nconst instace = new MyClass(options)\n\ninstance === new MyClass(instance)  // true\n```\n\nAnd it also works cross versions.\n\n## License\n\nMIT\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fkaelzhang%2Fgraceful-instanceof","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fkaelzhang%2Fgraceful-instanceof","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fkaelzhang%2Fgraceful-instanceof/lists"}