chore(style): Bring code quality tooling inline with Webpack

 - Adds editorconfig
 - Adds eslint package and config
 - Adds jsBeautify and config
 - Adds lint npm script
 - Adds beautify-lint npm script
 - Adds pretest npm script to exec linting
 - Fixes existing linting errors

.editorconfig

@@ -0,0 +1,5 @@
+root = true
+
+[*.js]
+indent_style=tab
+trim_trailing_whitespace=true

.eslintrc

@@ -0,0 +1,24 @@
+{
+	"env": {
+		"node": true
+	},
+	"rules": {
+		"strict": 0,
+		"camelcase": 0,
+		"curly": 0,
+		"indent": [2, "tab", { "SwitchCase": 1 }],
+		"eol-last": 1,
+		"no-shadow": 0,
+		"no-redeclare": 2,
+		"no-extra-bind": 1,
+		"no-empty": 0,
+		"no-process-exit": 1,
+		"no-underscore-dangle": 0,
+		"no-use-before-define": 0,
+		"no-unused-vars": 0,
+		"consistent-return": 0,
+		"no-inner-declarations": 1,
+		"no-loop-func": 1,
+		"space-before-function-paren": [2, "never"] 
+	}
+}

.jsbeautifyrc

@@ -0,0 +1,25 @@
+{
+  "js": {
+    "allowed_file_extensions": ["js", "json", "jshintrc", "jsbeautifyrc"],
+    "brace_style": "collapse",
+    "break_chained_methods": false,
+    "e4x": true,
+    "eval_code": false,
+    "end_with_newline": true,
+    "indent_char": "\t",
+    "indent_level": 0,
+    "indent_size": 1,
+    "indent_with_tabs": true,
+    "jslint_happy": false,
+    "jslint_happy_align_switch_case": true,
+    "space_after_anon_function": false,
+    "keep_array_indentation": false,
+    "keep_function_indentation": false,
+    "max_preserve_newlines": 2,
+    "preserve_newlines": true,
+    "space_before_conditional": false,
+    "space_in_paren": false,
+    "unescape_strings": false,
+    "wrap_line_length": 0
+  }
+}

index.js

@@ -6,14 +6,14 @@ var webpack = require("webpack");
 var SingleEntryDependency = require("webpack/lib/dependencies/SingleEntryDependency");
 
 function Plugin(
-			/* config.webpack */webpackOptions,
-			/* config.webpackServer */webpackServerOptions,
-			/* config.webpackMiddleware */webpackMiddlewareOptions,
-			/* config.basePath */basePath,
-			/* config.files */files,
-			/* config.frameworks */frameworks,
-			customFileHandlers,
-			emitter) {
+	webpackOptions, /* config.webpack */
+	webpackServerOptions, /* config.webpackServer */
+	webpackMiddlewareOptions, /* config.webpackMiddleware */
+	basePath, /* config.basePath */
+	files, /* config.files */
+	frameworks, /* config.frameworks */
+	customFileHandlers,
+	emitter) {
 	webpackOptions = _.clone(webpackOptions) || {};
 	webpackMiddlewareOptions = _.clone(webpackMiddlewareOptions || webpackServerOptions) || {};
 
@@ -97,7 +97,7 @@ function Plugin(
 		}
 	});
 
-	emitter.on("exit", function (done) {
+	emitter.on("exit", function(done) {
 		middleware.close();
 		done();
 	});
@@ -117,7 +117,7 @@ Plugin.prototype.addFile = function(entry) {
 Plugin.prototype.make = function(compilation, callback) {
 	async.forEach(this.files.slice(), function(file, callback) {
 		var entry = file;
-		if (this.wrapMocha) {
+		if(this.wrapMocha) {
 			entry = require.resolve("./mocha-env-loader") + "!" + entry;
 		}
 
@@ -159,22 +159,22 @@ Plugin.prototype.readFile = function(file, callback) {
 	if(!this.waiting)
 		doRead();
 	else
-		// Retry to read once a build is finished
-		// do it on process.nextTick to catch changes while building
+	// Retry to read once a build is finished
+	// do it on process.nextTick to catch changes while building
 		this.waiting.push(process.nextTick.bind(process, this.readFile.bind(this, file, callback)));
 };
 
-function createPreprocesor(/* config.basePath */basePath, webpackPlugin) {
+function createPreprocesor( /* config.basePath */ basePath, webpackPlugin) {
 	return function(content, file, done) {
 
-		if (webpackPlugin.addFile(file.path)) {
+		if(webpackPlugin.addFile(file.path)) {
 			// recompile as we have an asset that we have not seen before
 			webpackPlugin.middleware.invalidate();
 		}
 
 		// read blocks until bundle is done
 		webpackPlugin.readFile(path.relative(basePath, file.path), function(err, content) {
-			if (err) {
+			if(err) {
 				throw err;
 			}
 

mocha-env-loader.js

@@ -21,7 +21,7 @@ module.exports = function(content, map) {
 
 	var concatSrc = new SourceNode();
 	concatSrc.add([
-		"describe(" + JSON.stringify(id)  + ", function() {\n",
+		"describe(" + JSON.stringify(id) + ", function() {\n",
 		sourceNode,
 		"\n});"
 	]);

package.json

@@ -14,11 +14,19 @@
     "webpack-dev-middleware": "^1.0.11"
   },
   "devDependencies": {
+    "beautify-lint": "^1.0.4",
+    "coffee-loader": "~0.7.2",
+    "eslint": "^3.1.1",
+    "jsbeautify": "^0.3.6",
     "karma": ">=0.13.2 < 1",
-    "karma-mocha": "~0.1.9",
     "karma-chrome-launcher": "~0.1.5",
-    "karma-spec-reporter": "~0.0.16",
-    "coffee-loader": "~0.7.2"
+    "karma-mocha": "~0.1.9",
+    "karma-spec-reporter": "~0.0.16"
+  },
+  "scripts": {
+    "pretest": "npm run lint && npm run beautify-lint",
+    "lint": "eslint lib",
+    "beautify-lint": "beautify-lint *.js"
   },
   "license": "MIT",
   "homepage": "http://github.com/webpack/karma-webpack",