refactor: upgrade to webpack-defaults (#51)

 - Upgrades loader to webpack-defaults
 - Converts codebase to es6+ JavaScript syntax
 - Enforces webpack-contrib code style
 - Refactors to ESModule w/ a CJS proxy

BREAKING CHANGE: Enforces Webpack standard NodeJS engines range.
   at the time of merge `>= 4.3 < 5.0.0 || >= 5.10`.

BREAKING CHANGE: Upgrades loader-utils to 1.1.0 which has a minimum NodeJS version of 4.

.babelrc

@@ -0,0 +1,35 @@
+{
+  "presets": [
+    [
+      "env",
+      {
+        "useBuiltIns": true,
+        "targets": {
+          "node": "4.3"
+        },
+        "exclude": [
+          "transform-async-to-generator",
+          "transform-regenerator"
+        ]
+      }
+    ]
+  ],
+  "plugins": [
+    [
+      "transform-object-rest-spread",
+      {
+        "useBuiltIns": true
+      }
+    ]
+  ],
+  "env": {
+    "test": {
+      "presets": [
+        "env"
+      ],
+      "plugins": [
+        "transform-object-rest-spread"
+      ]
+    }
+  }
+}

.editorconfig

@@ -1,13 +1,14 @@
-; editorconfig.org
+# editorconfig.org
 root = true
 
 [*]
+charset = utf-8
 indent_style = space
-indent_size = 4
+indent_size = 2
 end_of_line = lf
-charset = utf-8
-trim_trailing_whitespace = true
 insert_final_newline = true
+trim_trailing_whitespace = true
 
-[*.{json,yml,md}]
-indent_size = 2
+[.md]
+insert_final_newline = false
+trim_trailing_whitespace = false

.eslintignore

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

.eslintrc

@@ -0,0 +1,3 @@
+{
+  "extends": "webpack"
+}

.gitattributes

@@ -0,0 +1,4 @@
+yarn.lock -diff
+* text=auto
+bin/* eol=lf
+package-lock.json -diff

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,7 @@
+<!--
+1. Check the version of package you are using. If it's not the newest version, update and try again (see changelog while updating!).
+2. If the issue is still there, write a minimal project showing the problem and expected output.
+3. Link to the project and mention Node version and OS in your report.
+
+**IMPORTANT! You should use [Stack Overflow](https://stackoverflow.com/) for support related questions.**
+-->

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,5 @@
+<!--
+1. [Read and sign the CLA](https://cla.js.foundation/webpack/webpack.js.org). This needs to be done only once. PRs that haven't signed it won't be accepted.
+2. Check out the [development guide](https://webpack.js.org/development/) for the API and development guidelines.
+3. Read through the PR diff carefully as sometimes this can reveal issues. The work will be reviewed, but this can save some effort.
+-->

.gitignore

@@ -3,3 +3,18 @@ tmp/
 *.sublime-*
 *.log
 .DS_Store
+
+logs
+npm-debug.log*
+yarn-debug.log*
+.eslintcache
+/coverage
+/dist
+/local
+/reports
+/node_modules
+Thumbs.db
+.idea
+.vscode
+*.sublime-project
+*.sublime-workspace

.travis.yml

@@ -0,0 +1,34 @@
+sudo: false
+language: node_js
+branches:
+  only:
+    - master
+matrix:
+  fast_finish: true
+  include:
+    - os: linux
+      node_js: '8'
+      env: WEBPACK_VERSION="2.6.0" JOB_PART=lint
+    - os: linux
+      node_js: '4.3'
+      env: WEBPACK_VERSION="2.6.0" JOB_PART=test
+    - os: linux
+      node_js: '6'
+      env: WEBPACK_VERSION="2.6.0" JOB_PART=test
+    - os: linux
+      node_js: '8'
+      env: WEBPACK_VERSION="2.6.0" JOB_PART=coverage
+before_install:
+  - 'if [[ `npm -v` != 5* ]]; then npm i -g npm@^5.0.0; fi'
+  - nvm --version
+  - node --version
+  - npm --version
+before_script:
+  - |-
+    if [ "$WEBPACK_VERSION" ]; then
+      npm i --no-save webpack@^$WEBPACK_VERSION
+    fi
+script:
+  - 'npm run travis:$JOB_PART'
+after_success:
+  - 'bash <(curl -s https://codecov.io/bash)'

CHANGELOG.md

@@ -0,0 +1,3 @@
+# Change Log
+
+All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.

README.md

@@ -1,19 +1,29 @@
-## Istanbul instrumenter loader for [webpack](https://webpack.js.org/)
-
-[![npm](http://img.shields.io/npm/v/istanbul-instrumenter-loader.svg?style=flat-square)](https://www.npmjs.org/package/istanbul-instrumenter-loader)
-[![deps](http://img.shields.io/david/deepsweet/istanbul-instrumenter-loader.svg?style=flat-square)](https://david-dm.org/deepsweet/istanbul-instrumenter-loader#info=dependencies)
+[![npm][npm]][npm-url]
+[![node][node]][node-url]
+[![deps][deps]][deps-url]
+[![tests][tests]][tests-url]
+[![coverage][cover]][cover-url]
+[![chat][chat]][chat-url]
+
+<div align="center">
+  <a href="https://github.com/webpack/webpack">
+    <img width="200" height="200"
+      src="https://webpack.js.org/assets/icon-square-big.svg">
+  </a>
+  <h1>Istanbul Instrumenter Loader</h1>
+</div>
 
 Instrument JS files with [istanbul-lib-instrument](https://github.com/istanbuljs/istanbul-lib-instrument) for subsequent code coverage reporting.
 
-### Install
+<h2 align="center">Install</h2>
 
-```sh
+```bash
 npm install --save-dev istanbul-instrumenter-loader
 # or
 yarn add --dev istanbul-instrumenter-loader
 ```
 
-### Setup
+<h2 align="center">Usage</h2>
 
 #### References
 
@@ -94,5 +104,63 @@ config.set({
 #### Options
 The loader supports all options supported by [istanbul-lib-instrument](https://github.com/istanbuljs/istanbul-lib-instrument/blob/master/api.md#instrumenter).
 
-### License
-MIT
+<h2 align="center">Contributing</h2>
+
+Don't hesitate to create a pull request. Every contribution is appreciated. In development you can start the tests by calling `npm test`.
+
+<h2 align="center">Maintainers</h2>
+
+<table>
+  <tbody>
+    <tr>
+      <td align="center">
+        <img width="150" height="150"
+        src="https://avatars.githubusercontent.com/u/266822?v=3&s=150">
+        </br>
+        <a href="https://github.com/deepsweet">Kir Belevich</a>
+      </td>
+      <td align="center">
+        <img width="150" height="150"
+        src="https://avatars3.githubusercontent.com/u/166921?v=3&s=150">
+        </br>
+        <a href="https://github.com/bebraw">Juho Vepsäläinen</a>
+      </td>
+      <td align="center">
+        <img width="150" height="150"
+        src="https://avatars2.githubusercontent.com/u/8420490?v=3&s=150">
+        </br>
+        <a href="https://github.com/d3viant0ne">Joshua Wiens</a>
+      </td>
+      <td align="center">
+        <img width="150" height="150"
+        src="https://avatars3.githubusercontent.com/u/533616?v=3&s=150">
+        </br>
+        <a href="https://github.com/SpaceK33z">Kees Kluskens</a>
+      </td>
+      <td align="center">
+        <img width="150" height="150"
+        src="https://avatars3.githubusercontent.com/u/3408176?v=3&s=150">
+        </br>
+        <a href="https://github.com/TheLarkInn">Sean Larkin</a>
+      </td>
+    </tr>
+  <tbody>
+</table>
+
+[npm]: https://img.shields.io/npm/v/istanbul-instrumenter-loader.svg
+[npm-url]: https://npmjs.com/package/istanbul-instrumenter-loader
+
+[node]: https://img.shields.io/node/v/istanbul-instrumenter-loader.svg
+[node-url]: https://nodejs.org
+
+[deps]: https://david-dm.org/webpack-contrib/istanbul-instrumenter-loader.svg
+[deps-url]: https://david-dm.org/webpack-contrib/istanbul-instrumenter-loader
+
+[tests]: http://img.shields.io/travis/webpack-contrib/istanbul-instrumenter-loader.svg
+[tests-url]: https://travis-ci.org/webpack-contrib/istanbul-instrumenter-loader
+
+[cover]: https://codecov.io/gh/webpack-contrib/istanbul-instrumenter-loader/branch/master/graph/badge.svg
+[cover-url]: https://codecov.io/gh/webpack-contrib/istanbul-instrumenter-loader
+
+[chat]: https://badges.gitter.im/webpack/webpack.svg
+[chat-url]: https://gitter.im/webpack/webpack