Modernize code base and add prettier

Modernize code base to es6, add prettier.

Create build and watch scripts.

-Add build script. Transforms files to dist folder if they are JS files
otherwise it copies the file.

-Add watch script. Watches changes on source files and runs build accordingly.

-Move tests and index file to src.

-Change babelrc to use on build.

-Rearrange config files to not include tests and irrelevant files while packing for release.

-Change code base to ES6 imports.

-Add yarn.lock file.

-Add yarn scripts to build and test before release.

More refactoring

Refactor parts that found during review.

Change worker-farm with jest-worker

Refactor index, drop support for watch mode

Author: Efe Gürkan YALAMAN

.babelrc

@@ -1,7 +1,21 @@
 {
-  "presets": [
-    ["env", {
-      "targets": {"node": 4}
-    }
-  ]]
+    "presets": [
+        [
+            "env",
+            {
+                "targets": { "node": 6 }
+            }
+        ]
+    ],
+    "plugins": [
+        "syntax-trailing-function-commas",
+        "transform-es2015-destructuring",
+        "transform-es2015-parameters",
+        "transform-async-to-generator",
+        "transform-strict-mode",
+        "transform-object-rest-spread",
+        "transform-es2015-modules-commonjs",
+        "transform-async-to-generator"
+    ],
+    "retainLines": true
 }

.circleci/config.yml

@@ -4,6 +4,7 @@ jobs:
     docker:
       # specify the version you desire here
       - image: circleci/node:6
+      - image: circleci/node:8
       - image: circleci/node:latest
 
     working_directory: ~/repo
@@ -13,6 +14,6 @@ jobs:
 
       - run: npm install
 
-      - run: npm  run test-only
+      - run: npm run test-only
 
 

.gitignore

@@ -1 +1,3 @@
 node_modules/
+coverage/
+dist/

.npmignore

@@ -0,0 +1,17 @@
+# Do not pack irrelevant dirs
+node_modules/
+coverage/
+__mocks__/
+__tests__/
+build/
+
+# Do not pack configs
+jest.config.js
+.circleci/
+.github/
+.babelrc
+.editorconfig
+.gitignore
+.prettierrc
+.travis.yml
+yarn.lock

.prettierignore

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

.prettierrc

@@ -0,0 +1,13 @@
+{
+    "singleQuote": true,
+    "tabWidth": 4,
+    "trailingComma": "all",
+    "overrides": [
+        {
+            "files": "**/build/**",
+            "options": {
+                "trailingComma": "es5"
+            }
+        }
+    ]
+}

.travis.yml

@@ -2,6 +2,7 @@ language: node_js
 node_js:
     - "node"
     - "6"
+    - "8"
 
 install:
     - npm install

README.md

@@ -1,5 +1,7 @@
 [![npm version](https://badge.fury.io/js/parallel-webpack.svg)](https://badge.fury.io/js/parallel-webpack)
-[![Build Status](https://travis-ci.org/trivago/parallel-webpack.svg?branch=master)](https://travis-ci.org/trivago/parallel-webpack) [![CircleCI](https://circleci.com/gh/trivago/parallel-webpack.svg?style=svg)](https://circleci.com/gh/trivago/parallel-webpack) [![Coverage Status](https://coveralls.io/repos/github/trivago/parallel-webpack/badge.svg?branch=coverage)](https://coveralls.io/github/trivago/parallel-webpack?branch=coverage)
+[![Build Status](https://travis-ci.org/trivago/parallel-webpack.svg?branch=master)](https://travis-ci.org/trivago/parallel-webpack)
+[![CircleCI](https://circleci.com/gh/trivago/parallel-webpack.svg?style=svg)](https://circleci.com/gh/trivago/parallel-webpack)
+[![Coverage Status](https://coveralls.io/repos/github/trivago/parallel-webpack/badge.svg?branch=coverage)](https://coveralls.io/github/trivago/parallel-webpack?branch=coverage)
 # parallel-webpack - Building multi-configs in parallel
 
 `parallel-webpack` allows you to run multiple webpack builds in parallel,
@@ -8,10 +10,18 @@ up your build. For us at [trivago](http://www.trivago.com) it has reduced
 the build from 16 minutes to just 2 minutes - for 32 variants. That performance
 improvement naturally comes at the expense of utilizing all available CPU cores.
 
+# IMPORTANT: Starting from 3.x watch mode will be dropped
+Starting from 3.x series we will drop support for watch mode. If you need it
+keep using ^2.2.0.
+
 ## Installation
 
 ```sh
 npm install parallel-webpack --save-dev
+
+# or
+
+yarn add --dev parallel-webpack
 ```
 
 You can choose whether to install `parallel-webpack` globally or locally.
@@ -127,17 +137,6 @@ The above configuration will create 16 variations of the build for you, which
 [WEBPACK] Started building MyLib.var.min.debug.js
 ```
 
-## Running the watcher
-
-One of the features that made webpack so popular is certainly its watcher which
-continously rebuilds your application.
-
-When using `parallel-webpack`, you can easily use the same feature as well by
-specifying the `--watch` option on the command line:
-
-```
-parallel-webpack --watch
-```
 
 ## Specifying retry limits
 
@@ -212,7 +211,8 @@ are no differences between various ways of invoking the `webpack.config.js`.
 ## Node.js API
 
 Just like webpack, you can also use `parallel-webpack` as an API from node.js
-(You can specify any other option used in [worker-farm](https://www.npmjs.com/package/worker-farm)):
+(For 2.x : you can specify any other option used in [worker-farm](https://www.npmjs.com/package/worker-farm)):
+(For 3.x : you can specify any other option used in [jest-worker](https://www.npmjs.com/package/jest-worker)):
 
 ```javascript
 var run = require('parallel-webpack').run,
@@ -222,7 +222,8 @@ run(configPath, {
     watch: false,
     maxRetries: 1,
     stats: true, // defaults to false
-    maxConcurrentWorkers: 2 // use 2 workers
+    maxConcurrentWorkers: 2, // use 2 workers if you are on 2.x version
+    maxWorkers: 2 // use 2 workers if you are in 3.x version
 });
 ```