diff --git a/src/index.js b/src/index.js
index 9347a2a..b40e0e5 100644
--- a/src/index.js
+++ b/src/index.js
@@ -13,28 +13,27 @@ const defaultJsdomConfig = {
 // IIFE executed on import to return an array of global Node.js properties that
 // conflict with global browser properties.
 const protectedproperties = (() => Object
-  .getOwnPropertyNames(new Window(defaultJsdomConfig))
-  .filter(prop => typeof global[prop] !== 'undefined')
+	.getOwnPropertyNames(new Window(defaultJsdomConfig))
+	.filter(prop => typeof global[prop] !== 'undefined')
 )();
 
 // Sets up global browser environment
-const browserEnv = function () {
-  // Extract options from args
-	const args = Array.from(arguments);
+const browserEnv = function (...args) {
+	// Extract options from args
 	const properties = args.filter(arg => Array.isArray(arg))[0];
 	const userJsdomConfig = args.filter(arg => !Array.isArray(arg))[0];
 
-  // Create window object
+	// Create window object
 	const window = new Window(Object.assign({}, userJsdomConfig, defaultJsdomConfig));
 
-  // Get all global browser properties
+	// Get all global browser properties
 	Object.getOwnPropertyNames(window)
 
-    // Remove protected properties
-    .filter(prop => protectedproperties.indexOf(prop) === -1)
+		// Remove protected properties
+		.filter(prop => !protectedproperties.includes(prop))
 
-    // If we're only applying specific required properties remove everything else
-    .filter(prop => !(properties && properties.indexOf(prop) === -1))
+		// If we're only applying specific required properties remove everything else
+		.filter(prop => !properties || properties.includes(prop))
 
     // Copy what's left to the Node.js global scope
     .forEach(prop => {
@@ -44,7 +43,7 @@ const browserEnv = function () {
 	});
 });
 
-  // Return reference to original window object
+	// Return reference to original window object
 	return window;
 };