Introduce babel's export-default-from plugin to fix build errors

We do a lot of default exporting, so we kinda need this. It even asks for it to be installed when it is missing.

package.json

@@ -114,6 +114,7 @@
     "@babel/core": "^7.7.5",
     "@babel/plugin-proposal-class-properties": "^7.7.4",
     "@babel/plugin-proposal-decorators": "^7.7.4",
+    "@babel/plugin-proposal-export-default-from": "^7.7.4",
     "@babel/plugin-proposal-numeric-separator": "^7.7.4",
     "@babel/plugin-proposal-object-rest-spread": "^7.7.4",
     "@babel/plugin-transform-flow-comments": "^7.7.4",