isBrowser or isNode works =)

Author: flexdinesh

.babelrc

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+{
+  "presets": ["stage-2", "es2015"],
+  "plugins": [
+    "add-module-exports"
+  ]
+}

.editorconfig

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+# EditorConfig helps developers define and maintain
+# consistent coding styles between different editors and IDEs.
+
+root = true
+
+[*]
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+indent_style = space
+indent_size = 2
+
+[*.md]
+trim_trailing_whitespace = false

.eslintignore

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+test

.eslintrc

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+{
+  "parser": "babel-eslint",
+  "extends": "airbnb",
+  "env": {
+    "mocha": true
+  },
+  rules: {
+    "comma-dangle": ["error", "only-multiline"]
+  }
+}

.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules
+jspm_packages
+
+# Optional npm cache directory
+.npm
+
+# Optional REPL history
+.node_repl_history
+
+# Editors
+.idea
+
+# Lib
+lib
+
+# npm package lock
+package-lock.json

.travis.yml

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+language: node_js
+node_js:
+  - '8'
+  - '6'
+script:
+  - npm run lint
+  - npm run test
+  - npm run build
+  - npm run test:examples
+branches:
+  only:
+    - master

LICENCE

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+The MIT License (MIT)
+
+Copyright (c) 2018 Dineshkumar Pandiyan <[email protected]>
+
+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.

README.md

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+# Browser or Node.js
+[![Build Status](https://travis-ci.org/flexdinesh/brower-or-node.svg?branch=master)](https://travis-ci.org/flexdinesh/brower-or-node)
+[![npm version](https://badge.fury.io/js/brower-or-node.svg)](https://www.npmjs.com/package/brower-or-node)
+[![dependencies Status](https://david-dm.org/flexdinesh/brower-or-node/status.svg)](https://david-dm.org/flexdinesh/brower-or-node)
+[![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg)](https://opensource.org/licenses/MIT)
+[![npm](https://img.shields.io/npm/dt/brower-or-node.svg)](https://www.npmjs.com/package/brower-or-node)
+
+Check whether the code is running in the browser or node.js runtime.
+
+## Install
+
+```
+$ npm install --save brower-or-node
+```
+
+## Usage
+
+ES6 style import
+```js
+import { isBrowser, isNode } from 'brower-or-node';
+
+if (isBrowser) {
+  // do browser only stuff
+}
+
+if (isNode) {
+  // do node.js only stuff
+}
+
+```
+ES5 style import
+```js
+var jsEnv = require('brower-or-node');
+
+if (jsEnv.isBrowser) {
+  // do browser only stuff
+}
+
+if (jsEnv.isNode) {
+  // do node.js only stuff
+}
+
+```
+
+## License
+
+MIT © Dineshkumar Pandiyan

examples/example.js

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+/* eslint-disable import/no-extraneous-dependencies, no-console */
+const jsEnv = require('../lib');
+
+console.log(jsEnv.isBrowser); // false when this runs in node.js
+console.log(jsEnv.isNode); // true when this runs in node.js

examples/index.js

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+const example = require('./example');
+
+module.exports = {
+  example
+};