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node_modules/is-natural-number/LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2014 - 2016 Shinnosuke Watanabe
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

node_modules/is-natural-number/README.md

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+# is-natural-number.js
+
+[![NPM version](https://img.shields.io/npm/v/is-natural-number.svg)](https://www.npmjs.com/package/is-natural-number)
+[![Bower version](https://img.shields.io/bower/v/is-natural-number.svg)](https://github.com/shinnn/is-natural-number.js/releases)
+[![Build Status](https://travis-ci.org/shinnn/is-natural-number.js.svg)](https://travis-ci.org/shinnn/is-natural-number.js)
+[![Coverage Status](https://img.shields.io/coveralls/shinnn/is-natural-number.js.svg)](https://coveralls.io/r/shinnn/is-natural-number.js?branch=master)
+[![devDependency Status](https://david-dm.org/shinnn/is-natural-number.js/dev-status.svg)](https://david-dm.org/shinnn/is-natural-number.js#info=devDependencies)
+
+Check if a value is a [natural number](https://wikipedia.org/wiki/Natural_number)
+
+## Installation
+
+### Package managers
+
+#### [npm](https://www.npmjs.com/)
+
+```
+npm install is-natural-number
+```
+
+#### [Bower](http://bower.io/)
+
+```
+bower install is-natural-number
+```
+
+#### [Duo](http://duojs.org/)
+
+```javascript
+var isNaturalNumber = require('shinnn/is-natural-number.js');
+```
+
+### Standalone
+
+[Download the script file directly.](https://raw.githubusercontent.com/shinnn/is-natural-number.js/master/is-natural-number.js)
+
+## API
+
+### isNaturalNumber(*number*, *option*)
+
+*number*: `Number`  
+*option*: `Object`  
+Return: `Boolean`
+
+It returns `true` if the first argument is one of the natural numbers. If not, or the argument is not a number, it returns `false`.
+
+```javascript
+isNaturalNumber(10); //=> true
+
+isNaturalNumber(-10); //=> false
+isNaturalNumber(10.5); //=> false
+isNaturalNumber(Infinity); //=> false
+isNaturalNumber('10'); //=> false
+```
+
+*Check [the test](./test.js) for more detailed specifications.*
+
+#### option.includeZero
+
+Type: `Boolean`
+Default: `false`
+
+By default the number `0` is not regarded as a natural number.
+
+Setting this option `true` makes `0` regarded as a natural number.
+
+```javascript
+isNaturalNumber(0); //=> false
+isNaturalNumber(0, {includeZero: true}); //=> true
+```
+
+## License
+
+Copyright (c) 2014 - 2016 [Shinnosuke Watanabe](https://github.com/shinnn)
+
+Licensed under [the MIT License](./LICENSE).

node_modules/is-natural-number/index.js

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+/*!
+ * is-natural-number.js | MIT (c) Shinnosuke Watanabe
+ * https://github.com/shinnn/is-natural-number.js
+*/
+'use strict';
+
+module.exports = function isNaturalNumber(val, option) {
+  if (option) {
+    if (typeof option !== 'object') {
+      throw new TypeError(
+        String(option) +
+        ' is not an object. Expected an object that has boolean `includeZero` property.'
+      );
+    }
+
+    if ('includeZero' in option) {
+      if (typeof option.includeZero !== 'boolean') {
+        throw new TypeError(
+          String(option.includeZero) +
+          ' is neither true nor false. `includeZero` option must be a Boolean value.'
+        );
+      }
+
+      if (option.includeZero && val === 0) {
+        return true;
+      }
+    }
+  }
+
+  return Number.isSafeInteger(val) && val >= 1;
+};

node_modules/is-natural-number/index.jsnext.js

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+/*!
+ * is-natural-number.js | MIT (c) Shinnosuke Watanabe
+ * https://github.com/shinnn/is-natural-number.js
+*/
+export default function isNaturalNumber(val, option) {
+  if (option) {
+    if (typeof option !== 'object') {
+      throw new TypeError(
+        String(option) +
+        ' is not an object. Expected an object that has boolean `includeZero` property.'
+      );
+    }
+
+    if ('includeZero' in option) {
+      if (typeof option.includeZero !== 'boolean') {
+        throw new TypeError(
+          String(option.includeZero) +
+          ' is neither true nor false. `includeZero` option must be a Boolean value.'
+        );
+      }
+
+      if (option.includeZero && val === 0) {
+        return true;
+      }
+    }
+  }
+
+  return Number.isSafeInteger(val) && val >= 1;
+}

node_modules/is-natural-number/package.json

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+{
+  "_from": "is-natural-number@^4.0.1",
+  "_id": "is-natural-number@4.0.1",
+  "_inBundle": false,
+  "_integrity": "sha1-q5124dtM7VHjXeDHLr7PCfc0zeg=",
+  "_location": "/is-natural-number",
+  "_phantomChildren": {},
+  "_requested": {
+    "type": "range",
+    "registry": true,
+    "raw": "is-natural-number@^4.0.1",
+    "name": "is-natural-number",
+    "escapedName": "is-natural-number",
+    "rawSpec": "^4.0.1",
+    "saveSpec": null,
+    "fetchSpec": "^4.0.1"
+  },
+  "_requiredBy": [
+    "/strip-dirs"
+  ],
+  "_resolved": "https://registry.npmjs.org/is-natural-number/-/is-natural-number-4.0.1.tgz",
+  "_shasum": "ab9d76e1db4ced51e35de0c72ebecf09f734cde8",
+  "_spec": "is-natural-number@^4.0.1",
+  "_where": "C:\\Users\\matia\\Musix\\node_modules\\strip-dirs",
+  "author": {
+    "name": "Shinnosuke Watanabe",
+    "url": "https://github.com/shinnn"
+  },
+  "bugs": {
+    "url": "https://github.com/shinnn/is-natural-number.js/issues"
+  },
+  "bundleDependencies": false,
+  "deprecated": false,
+  "description": "Check if a value is a natural number",
+  "devDependencies": {
+    "@shinnn/eslint-config": "^2.1.0",
+    "eslint": "^2.9.0",
+    "istanbul": "^0.4.3",
+    "require-from-string": "^1.2.0",
+    "rollup": "^0.26.3",
+    "tap-dot": "^1.0.5",
+    "tape": "^4.5.1"
+  },
+  "files": [
+    "index.js",
+    "index.jsnext.js"
+  ],
+  "homepage": "https://github.com/shinnn/is-natural-number.js#readme",
+  "jsnext:main": "index.jsnext.js",
+  "keywords": [
+    "number",
+    "natural",
+    "check",
+    "int",
+    "integer",
+    "math",
+    "mathematics",
+    "range",
+    "browser",
+    "client-side"
+  ],
+  "license": "MIT",
+  "name": "is-natural-number",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/shinnn/is-natural-number.js.git"
+  },
+  "scripts": {
+    "coverage": "node --strong_mode node_modules/.bin/istanbul cover test.js",
+    "pretest": "eslint --config @shinnn --ignore-path .gitignore .",
+    "test": "node --strong_mode --throw-deprecation --track-heap-objects test.js | tap-dot"
+  },
+  "version": "4.0.1"
+}