fix browser tests

src/babel/transformation/file/plugin-manager.js

@@ -31,7 +31,7 @@ export default class PluginManager {
     // this is a plugin in the form of "foobar" or "foobar:after"
     // where the optional colon is the delimiter for plugin position in the transformer stack
 
-    var match = key.match(/^(.*?):(after|before)$/);
+    var match = name.match(/^(.*?):(after|before)$/);
     if (match) [, name, position] = match;
 
     var loc = util.resolveRelative(name) || util.resolveRelative(`babel-plugin-${name}`);

src/babel/util.js

@@ -43,6 +43,9 @@ export function resolve(loc: string) {
 var relativeMod;
 
 export function resolveRelative(loc: string) {
+  // we're in the browser, probably
+  if (typeof Module === "object") return null;
+
   if (!relativeMod) {
     relativeMod = new Module;
     relativeMod.paths = Module._nodeModulePaths(process.cwd());