Note to self: If you ever get this Uncaught ReferenceError: webpackJsonp is not defined message and you’re absolutely surely positive you’ve included vendors.js in the app before your bundle.js, it’s probably because you did something to upset webpack while it was watching your files. This morning all it took was to restart the watch process.

In the great histogram of “WTF is going on here? Why isn’t this working”, that should get up to about 90 + 9.8 = 99.8% of all the reasons for Uncaught ReferenceError: webpackJsonp is not defined