Upgrading to 1.2 from 1.1.8 breaks requirejs usage

[vrobinson]

Code to reproduce the issue:

<script src="/libs/require/2.3.2/require.min.js" type="text/javascript" data-main="/config"></script> requirejs.config({ paths: { 'switch-path': '//unpkg.com/switch-path@1.2.0/dist/switch-path' }, });

define(function (require) {
const switchPath = require('switch-path');
});

Expected behavior:
switchPath to be defined

Actual behavior:
swithPath is undefined

Versions of packages used:
This code works in v1.1.8, but not v1.2.0. A diff of the two files shows that the first line of code which wraps the rest of the file is pretty different.