diff --git a/build/configs.js b/build/configs.js
index f81ec3a93..462461b3e 100644
--- a/build/configs.js
+++ b/build/configs.js
@@ -33,7 +33,20 @@ module.exports = [
   {
     file: resolve('dist/vue-router.esm.js'),
     format: 'es'
+  },
+  {
+    file: resolve('dist/vue-router.esm.browser.js'),
+    format: 'es',
+    env: 'development',
+    transpile: false
   }
+  // TODO: this won't work because uglify can't handle `const` or any modern JS :/
+  // {
+  //   file: resolve('dist/vue-router.esm.browser.min.js'),
+  //   format: 'es',
+  //   env: 'production',
+  //   transpile: false
+  // }
 ].map(genConfig)
 
 function genConfig (opts) {
@@ -46,8 +59,7 @@ function genConfig (opts) {
         cjs(),
         replace({
           __VERSION__: version
-        }),
-        buble()
+        })
       ]
     },
     output: {
@@ -64,5 +76,9 @@ function genConfig (opts) {
     }))
   }
 
+  if (opts.transpile !== false) {
+    config.input.plugins.push(buble())
+  }
+
   return config
 }