(new build) create build and test for the first method

.babelrc

@@ -0,0 +1,3 @@
+{
+  "presets": ["env"]
+}

.eslintrc

@@ -1,3 +1,6 @@
 {
-  "extends": "airbnb"
+  "extends": "airbnb",
+  "env": {
+    "mocha": true
+  }
 }

.gitignore

@@ -0,0 +1,2 @@
+node_modules/
+dist/

package.json

@@ -1,15 +1,30 @@
 {
   "name": "remram",
   "version": "1.0.0",
-  "main": "index.js",
+  "main": "dist/index.js",
   "repository": "https://github.com/gtkatakura/remram.git",
   "author": "gtkatakura <gt.katakura@gmail.com>",
   "license": "MIT",
+  "scripts": {
+    "build": "webpack",
+    "test": "npm run coverage",
+    "test:all": "mocha --compilers js:babel-core/register test/**/*.spec.js",
+    "coverage": "nyc -r=lcov -r=text -i babel-core/register mocha test/**/*.spec.js"
+  },
   "devDependencies": {
+    "babel-cli": "^6.24.1",
+    "babel-core": "^6.25.0",
+    "babel-loader": "^7.1.1",
+    "babel-preset-env": "^1.6.0",
+    "chai": "^4.1.0",
     "eslint": "3.19.0",
     "eslint-config-airbnb": "^15.0.2",
     "eslint-plugin-import": "2.6.1",
     "eslint-plugin-jsx-a11y": "5.1.1",
-    "eslint-plugin-react": "7.1.0"
-  }
+    "eslint-plugin-react": "7.1.0",
+    "mocha": "^3.4.2",
+    "nyc": "^11.0.3",
+    "webpack": "^3.3.0"
+  },
+  "dependencies": {}
 }

src/array/flatten.js

@@ -0,0 +1,3 @@
+const flatten = array => [].concat(...array);
+
+export default flatten;

src/array/index.js

@@ -0,0 +1,5 @@
+import flatten from './flatten';
+
+export default {
+  flatten,
+};

src/index.js

@@ -0,0 +1,3 @@
+import array from './array';
+
+export default array;

test/array/flatten.spec.js

@@ -0,0 +1,33 @@
+import { expect } from 'chai';
+import _ from '../../src';
+
+const { flatten } = _;
+
+describe('flatten', () => {
+  describe('when is a empty array', () => {
+    it('should return a empty array', () => {
+      expect(flatten([])).to.eql([]);
+    });
+  });
+
+  describe('when is a linear array', () => {
+    it('should return a linear array', () => {
+      const result = flatten([1, 2, 3]);
+      expect(result).to.eql([1, 2, 3]);
+    });
+  });
+
+  describe('when is a array with one level', () => {
+    it('should return a linear array', () => {
+      const result = flatten([[1, 2, 3]]);
+      expect(result).to.eql([1, 2, 3]);
+    });
+  });
+
+  describe('when is a array with two levels', () => {
+    it('should return a array with one level', () => {
+      const result = flatten([[[1, 2, 3]]]);
+      expect(result).to.eql([[1, 2, 3]]);
+    });
+  });
+});

webpack.config.js

@@ -0,0 +1,16 @@
+const path = require('path');
+
+module.exports = {
+  entry: './src/index.js',
+  output: {
+    path: path.join(__dirname, 'dist'),
+    filename: 'bundle.js',
+  },
+  module: {
+    loaders: [{
+      test: /.js$/,
+      loader: 'babel-loader',
+      exclude: /node_modules/,
+    }],
+  },
+};