feat: Basic Project Setup

.babelrc

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+{
+  "env": {
+    // Don't disable modules when testing as they are needed
+    "test": {
+      "presets": ["env"]
+    },
+    // Configuration for rollup (needs modules disabled).
+    "development": {
+      "presets": [
+        [
+          "env",
+          {
+            "modules": false
+          }
+        ]
+      ],
+      "plugins": ["external-helpers"]
+    }
+  }
+}

.codeclimate.yml

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+engines: 
+  eslint:
+    enabled: true
+    channel: "eslint-4"
+
+ratings:
+  paths:
+    - "src/"
+
+exclude_paths:
+  - "lib/"
+  - "**.test.js"

.eslintrc.js

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+module.exports = {
+  extends: ['eslint-config-airbnb-base', 'prettier'],
+  plugins: ['prettier', 'lodash'],
+  env: {
+    browser: true,
+    jest: true,
+  },
+  parserOptions: {
+    sourceType: 'module',
+    ecmaFeatures: {
+      jsx: true,
+    },
+  },
+  globals: {
+    l: true,
+  },
+  rules: {
+    'func-names': ['error', 'never'],
+    'no-param-reassign': 'off',
+    'import/no-extraneous-dependencies': 'off',
+    'no-confusing-arrow': 'off',
+    quotes: ['error', 'single', { avoidEscape: true }],
+    'jsx-quotes': ['error', 'prefer-double'],
+    'comma-dangle': ['error', 'always-multiline'],
+    'valid-jsdoc': ['error'],
+    'no-restricted-syntax': ['error', 'LabeledStatement', 'WithStatement'],
+    'import/extensions': ['off', 'never'],
+  },
+};

.gitignore

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+node_modules
+yarn-error.log
+coverage
+out

.prettierignore

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+/Users/pedr/Library/Application\ Support/Code/User/snippets/javascript.json

.prettierrc

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+{
+  "printWidth": 80,
+  "tabWidth": 2,
+  "semi": true,
+  "singleQuote": true,
+  "trailingComma": "es5",
+  "overrides": [
+    {
+      "files": ".prettierrc",
+      "options": { "parser": "json" }
+    },
+    {
+      "files": ".babelrc",
+      "options": { "parser": "json" }
+    }
+  ]
+}

LICENSE.md

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+MIT License
+
+Copyright (c) [year] [fullname]
+
+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.

jest.config.js

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+module.exports = {
+  bail: true,
+  verbose: true,
+  collectCoverage: true,
+  collectCoverageFrom: ['src/**/*.js'],
+  coveragePathIgnorePatterns: ['src/index.js'],
+  setupFiles: [],
+};

lib/index.js

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+'use strict';
+
+Object.defineProperty(exports, '__esModule', { value: true });
+
+var test = function test(value) {
+  return 'Working';
+};
+
+exports.test = test;

package.json

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+{
+  "devDependencies": {
+    "babel": "^6.23.0",
+    "babel-env": "^2.4.1",
+    "eslint": "^4.10.0",
+    "jest": "^21.2.1",
+    "prettier": "^1.8.2"
+  },
+  "dependencies": {
+    "babel-plugin-external-helpers": "^6.22.0",
+    "rollup": "^0.51.3",
+    "rollup-plugin-babel": "^3.0.2",
+    "rollup-plugin-node-resolve": "^3.0.0"
+  },
+  "scripts": {
+    "build": "NODE_ENV=development rollup --config",
+    "test": "NODE_ENV=test jest --config jest.config.js --watch",
+    "test:cov": "NODE_ENV=test jest --config jest.config.js --watch --coverage"
+  }
+}

rollup.config.js

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+import nodeResolve from 'rollup-plugin-node-resolve';
+import babel from 'rollup-plugin-babel';
+
+// Trasnpiled using Babel
+export default {
+  input: 'src/index.js',
+  output: {
+    file: 'lib/index.js',
+    format: 'cjs', // Use Common JS Modules in transpiled code
+  },
+  plugins: [
+    nodeResolve(),
+
+    babel({
+      exclude: 'node_modules/**', // only transpile project source
+    }),
+  ],
+};

src/__tests__/index.js

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+import { test } from '../index';
+
+describe('test', () => {
+  it('returns', () => {
+    expect(test(44)).toBe('Working');
+  });
+});

src/index.js

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+export const test = value => 'Working';