Export default was not found

Either specify default as mentioned above, or if you're trying to export multiple items from the same file you need to import them with curly brackets.

So you would have:

export function doWork(){}
export const myVariable = true;

And then you'd import them in a separate file as:

import { doWork, myVariable} from "./myES6Module"

You have to specify default explicitly:

export default function translateDate(date) {
   ..
}