transpiler error in IE11

[frei-0xff]

Looks like babel doesn't transpile es6 arrow functions from modules in node_modules.

How to replicate the issue:
Create new app with create-razzle-app
npm install --save split-on-first
Add import splitOnFirst from 'split-on-first' to src/client.js
npm run build
npm run start:prod

In build/public/static/js/bundle.xxxxxxxx.js can be found
...
"use strict"; e.exports=(e,t)=>{ if("string"!==typeof e||"string"!==typeof t) throw new TypeError("Expected the arguments to be of type string");
...

And in IE11's console we get "Syntax error in bundle.xxxxxxxx.js"

I put that sample in https://github.com/frei-0xff/razzle-ie11-issue

[frei-0xff]

Looks like it's the same as #998. Closing.