`import` cannot be called from a module

[letorbi]

Firefox 59 throws an error when an ES6 module is loaded via:

import * as foo from 'fooModule';

This seems to be due to the fact that import statements are only allowed on the top-level of a script, but the module-code loaded by Tarp.require is wrapped into a function.

[letorbi]

A possible solution would be the implementation of https://github.com/tc39/proposal-dynamic-import.