How to import functions from different js file in a Vue+webpack+vue-loader project

Question

(See end for why this is not a dupe of How do I include a JavaScript file in another JavaScript file?)

Javascipt + Vue + webpack + vue-loader noob... stumbling on the si

Answer 1

After a few hours of messing around I eventually got something that works, partially answered in a similar issue here: How do I include a JavaScript file in another JavaScript file?

BUT there was an import that was screwing the rest of it up:

Use require in .vue files