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  "readme": "# event-target-shim\n\n[![Build Status](https://travis-ci.org/mysticatea/event-target-shim.svg?branch=master)](https://travis-ci.org/mysticatea/event-target-shim)\n[![Coverage Status](https://coveralls.io/repos/mysticatea/event-target-shim/badge.svg?branch=master&service=github)](https://coveralls.io/github/mysticatea/event-target-shim?branch=master)\n[![Dependency Status](https://david-dm.org/mysticatea/event-target-shim.svg)](https://david-dm.org/mysticatea/event-target-shim)\n[![devDependency Status](https://david-dm.org/mysticatea/event-target-shim/dev-status.svg)](https://david-dm.org/mysticatea/event-target-shim#info=devDependencies)<br>\n[![npm version](https://img.shields.io/npm/v/event-target-shim.svg)](https://www.npmjs.com/package/event-target-shim)\n[![Downloads/month](https://img.shields.io/npm/dm/event-target-shim.svg)](https://www.npmjs.com/package/event-target-shim)\n\nAn implementation of [W3C EventTarget interface](http://www.w3.org/TR/2000/REC-DOM-Level-2-Events-20001113/events.html#Events-EventTarget), plus few extensions.\n\n- This provides `EventTarget` constructor that can inherit for your custom object.\n- This provides an utility that defines properties of attribute listeners (e.g. `obj.onclick`).\n\n```js\n// The prototype of this class has getters and setters of `onmessage` and `onerror`.\nclass Foo extends EventTarget(\"message\", \"error\") {\n    //...\n}\n```\n\n## Installation\n\n```\nnpm install --save event-target-shim\n```\n\nOr download from `dist` directory.\n\n## Usage\n\n### Basic\n\n```js\n//-----------------------------------------------------------------------------\n// import (with browserify, webpack, etc...).\nconst EventTarget = require(\"event-target-shim\");\n\n//-----------------------------------------------------------------------------\n// define a custom type.\nclass Foo extends EventTarget {\n}\n\n//-----------------------------------------------------------------------------\n// add event listeners.\nlet foo = new Foo();\nfoo.addEventListener(\"foo\", event => {\n    console.log(event.hello);\n});\nfoo.addEventListener(\"foo\", event => {\n    if (event.hello !== \"hello\") {\n        // event implements Event interface.\n        event.preventDefault();\n    }\n});\n\n//-----------------------------------------------------------------------------\n// dispatch an event.\nlet event = document.createEvent(\"CustomEvent\");\nevent.initCustomEvent(\"foo\", /*bubbles*/ false, /*cancelable*/ false, /*detail*/ null);\nevent.hello = \"hello\";\nfoo.dispatchEvent(event);\n\n//-----------------------------------------------------------------------------\n// dispatch an event simply (non standard).\nfoo.dispatchEvent({type: \"foo\", hello: \"hello\"});\n\n//-----------------------------------------------------------------------------\n// dispatch a cancelable event.\nif (!foo.dispatchEvent({type: \"foo\", cancelable: true, hello: \"hey\"})) {\n    console.log(\"defaultPrevented\");\n}\n\n//-----------------------------------------------------------------------------\n// If `window.EventTarget` exists, `EventTarget` inherits from `window.EventTarget`.\nif (foo instanceof window.EventTarget) {\n    console.log(\"yay!\");\n}\n```\n\n### The Extension for Attribute Listeners\n\n```js\n//-----------------------------------------------------------------------------\n// import (with browserify, webpack, etc...).\nconst EventTarget = require(\"event-target-shim\");\n\n//-----------------------------------------------------------------------------\n// define a custom type with attribute listeners.\nclass Foo extends EventTarget(\"message\", \"error\") {\n}\n// or non-variadic\nclass Foo extends EventTarget([\"message\", \"error\"]) {\n}\n\n//-----------------------------------------------------------------------------\n// add event listeners.\nlet foo = new Foo();\nfoo.onmessage = event => {\n    console.log(event.data);\n};\nfoo.onerror = event => {\n    console.log(event.message);\n};\nfoo.addEventListener(\"message\", event => {\n    console.log(event.data);\n});\n\n//-----------------------------------------------------------------------------\n// dispatch a event simply (non standard).\nfoo.dispatchEvent({type: \"message\", data: \"hello\"});\nfoo.dispatchEvent({type: \"error\", message: \"an error\"});\n```\n\n### Use in ES5\n\n- Basic.\n\n  ```js\n  function Foo() {\n      EventTarget.call(this);\n  }\n\n  Foo.prototype = Object.create(EventTarget.prototype, {\n      constructor: {\n          value: Foo,\n          configurable: true,\n          writable: true\n      },\n\n      //....\n  });\n  ```\n\n- With attribute listeners.\n\n  ```js\n  function Foo() {\n      EventTarget.call(this);\n  }\n\n  Foo.prototype = Object.create(EventTarget(\"message\", \"error\").prototype, {\n  // or\n  // Foo.prototype = Object.create(EventTarget([\"message\", \"error\"]).prototype, {\n      constructor: {\n          value: Foo,\n          configurable: true,\n          writable: true\n      },\n\n      //....\n  });\n  ```\n\n### Use with RequireJS\n\n```js\nrequire([\"https://cdn.rawgit.com/mysticatea/event-target-shim/v1.1.0/dist/event-target-shim.min.js\"], function(EventTarget) {\n    //...\n});\n```\n\n## API\n\n```ts\ndeclare class EventTarget {\n    constructor();\n    addEventListener(type: string, listener?: (event: Event) => void, capture: boolean = false): void;\n    removeEventListener(type: string, listener?: (event: Event) => void, capture: boolean = false): void;\n    dispatchEvent(event: Event | {type: string, cancelable?: boolean}): void;\n}\n\n// Define EventTarget type with attribute listeners.\ndeclare function EventTarget(...types: string[]): EventTarget;\ndeclare function EventTarget(types: string[]): EventTarget;\n```\n",
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    "build:dist-min": "uglifyjs dist/event-target-shim.js --compress --mangle > dist/event-target-shim.min.js",
    "clean": "rimraf coverage dist",
    "coveralls": "cat ./coverage/lcov.info | coveralls",
    "lint": "eslint lib test",
    "postversion": "git push && git push --tags",
    "preversion": "npm run build",
    "test": "npm-run-all clean lint && karma start karma.conf.js --single-run",
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    "watch": "karma start karma.conf.js --watch"
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