babel: improve perf.

YusukeShimizu · Jul 17, 2017 · 1860064 · 1860064
1 parent 3d65488
commit 1860064
Showing 1 changed file with 9 additions and 1 deletion.
diff --git a/.babelrc b/.babelrc
@@ -1,7 +1,15 @@
 {
-  "presets": ["es2017", "es2016", "es2015"],
+  "presets": [
+    ["es2017"],
+    ["es2016"],
+    ["es2015", {
+      "loose": true,
+      "spec": false
+    }]
+  ],
   "plugins": [
     ["transform-runtime", {
+      "helpers": true,
       "polyfill": true,
       "regenerator": true
     }]