Refactored index.js to match the new code style

Author: OlehDutchenko

index.js

@@ -1,57 +1,42 @@
-'use strict';
-
-/**
- * @module
- * @author Oleg Dutchenko <[email protected]>
- * @version 1.0.3
- * @contributors
- *  - April Arcus {@link https://github.com/AprilArcus}
- */
-
-var path = require('path')
-  , escapeStringRegexp = require('escape-string-regexp')
-  , ESCAPED_NODE_MODULES = escapeStringRegexp('node_modules')
-  , ESCAPED_PATH_SEP = escapeStringRegexp(path.sep);
-
-// ----------------------------------------
-// Public
-// ----------------------------------------
+const path = require('path');
+const escapeStringRegexp = require('escape-string-regexp');
+const ESCAPED_NODE_MODULES = escapeStringRegexp('node_modules');
+const ESCAPED_PATH_SEP = escapeStringRegexp(path.sep);
 
 /**
  * Creating a regular expression for excluding node modules
  * from babel transpiling except for individual modules
  * @param {string[]} [exceptionList] - exclude all modules except this list
  * @return {RegExp}
  */
-function babelLoaderExcludeNodeModulesExcept (exceptionList) {
-	var normalizedExceptionList
-	  , alternationGroup
-	  , negativeLookahead
-
+function babelLoaderExcludeNodeModulesExcept(exceptionList) {
 	if (Array.isArray(exceptionList) && exceptionList.length) {
 		// Module names can contain path separators, e.g. "@types/react".
 		// Assume POSIX input and normalize for the current platform.
-		normalizedExceptionList = exceptionList.map(function (moduleName) {
+		const normalizedExceptionList = exceptionList.map(function (moduleName) {
 			// We'll handle trailing path separators when we build the
 			// negative lookahead, so remove them if present.
 			if (moduleName[moduleName.length - 1] === path.posix.sep) {
 				moduleName = moduleName.slice(0, -1);
 			}
 			return moduleName.split(path.posix.sep).join(path.sep);
 		});
-		alternationGroup = '(' + normalizedExceptionList.map(escapeStringRegexp).join('|') + ')';
+
+		const alternationGroup =
+			'(' + normalizedExceptionList.map(escapeStringRegexp).join('|') + ')';
+
 		// If the exception list includes e.g. "react", we don't want to
 		// accidentally make an exception for "react-dom", so make sure to
 		// include a trailing path separator inside the negative lookahead.
-		negativeLookahead = '(?!' + alternationGroup + ESCAPED_PATH_SEP + ')';
-		return new RegExp(ESCAPED_NODE_MODULES + ESCAPED_PATH_SEP + negativeLookahead, 'i');
+		const negativeLookahead = '(?!' + alternationGroup + ESCAPED_PATH_SEP + ')';
+
+		return new RegExp(
+			ESCAPED_NODE_MODULES + ESCAPED_PATH_SEP + negativeLookahead,
+			'i'
+		);
 	} else {
 		return new RegExp(ESCAPED_NODE_MODULES, 'i');
 	}
 }
 
-// ----------------------------------------
-// Exports
-// ----------------------------------------
-
 module.exports = babelLoaderExcludeNodeModulesExcept;