7.1.5 ee('CP/FilePicker') produced button throw's a JavaScript exception: Uncaught ReferenceError: FileField is not defined

[tjdraper]

In my field type, I use a native file picker dialog, which I have done since EE 3 with ee('CP/FilePicker') However, in EE 7.1.5, this appears to be broken as the JavaScript appears to be looking for a FileField? I don't know, it's hard to tell because it's minified JS and I find debugging JS I didn't write to be hard to debug in any event.

Here’s my code to produce the file picker link:

$picker = ee('CP/FilePicker')->make(4);

$link = $picker->getLink('Select existing image')
    ->enableFilters()
    ->enableUploads()
    ->asList()
    ->render();

That code works in EE 6 and previous but fails in EE 7:

Here it is working in EE 6:

If I need to do something different in EE 7 let me know, but since the CP/FilePicker still exists I would expect it to still work?