add more feature detection to 6to5/register

lib/6to5/register.js

@@ -6,7 +6,7 @@ var _                = require("lodash");
 
 sourceMapSupport.install({
   retrieveSourceMap: function (source) {
-    var map = maps[source];
+    var map = maps && maps[source];
     if (map) {
       return {
         url: null,
@@ -31,8 +31,23 @@ var blacklistTest = function (transformer, code) {
   }
 };
 
-blacklistTest("generators", "function test *() {}");
-blacklistTest("letScoping", "let test = 0;");
+// array comprehension
+blacklistTest("arrowFunctions", "var foo = x => x * x;");
+blacklistTest("classes", "class Foo {}");
+// computed property names
+// constants
+// defaultParamters
+// descturing
+// forOf
+blacklistTest("generators", "function foo *() {}");
+blacklistTest("letScoping", "let foo = 0;");
+// modules
+// propertyMethodAssignment
+// propertyNameShorthand
+// restParameters
+// spread
+blacklistTest("templateLiterals", "`foo`");
+blacklistTest("unicodeRegex", "/foo/u");
 
 //
 
@@ -79,5 +94,9 @@ module.exports = function (opts) {
     ignoreRegex = opts.ignoreRegex;
   }
 
+  if (opts.blacklist) {
+    blacklist = opts.blacklist;
+  }
+
   if (opts.extensions) hookExtensions(opts.extensions);
 };