Fix linting warnings.

src/index.js

@@ -18,9 +18,8 @@ const protectedproperties = (() => Object
 )();
 
 // Sets up global browser environment
-const browserEnv = function () {
+const browserEnv = function (...args) {
 	// Extract options from args
-	const args = Array.from(arguments);
 	const properties = args.filter(arg => Array.isArray(arg))[0];
 	const userJsdomConfig = args.filter(arg => !Array.isArray(arg))[0];
 
@@ -31,10 +30,10 @@ const browserEnv = function () {
 	Object.getOwnPropertyNames(window)
 
 		// Remove protected properties
-    .filter(prop => protectedproperties.indexOf(prop) === -1)
+		.filter(prop => !protectedproperties.includes(prop))
 
 		// If we're only applying specific required properties remove everything else
-    .filter(prop => !(properties && properties.indexOf(prop) === -1))
+		.filter(prop => !properties || properties.includes(prop))
 
     // Copy what's left to the Node.js global scope
     .forEach(prop => {