extend import config from es7-jsx in case you don't wan't warnings.

config/es7-jsx.js

@@ -2,6 +2,7 @@
  * Parser options to allow ES7 + JSX syntax in imported files.
  */
 module.exports = {
+  extends: 'import',
   // see https://github.com/babel/babel/tree/master/packages/babylon#options
   // plugins array is not merged with defaults, so include all desired plugins.
   settings: {