[change] Compile using Babel 7

Fix #1170
Close #1205
Close #1191

packages/benchmarks/webpack.config.js

@@ -34,7 +34,7 @@ module.exports = {
           loader: 'babel-loader',
           options: {
             cacheDirectory: false,
-            presets: babelPreset,
+            presets: [babelPreset],
             plugins: ['styled-jsx/babel']
           }
         }