TypeError: (intermediate value)() is null

Error

TypeError: (intermediate value)() is null
    Ember 10
vue.runtime.esm.js:3065:16

Code

The error is raised by the following

import { getFilePickerBuilder } from '@nextcloud/dialogs'

document.addEventListener('DOMContentLoaded', function () {
    ;$('.select-folder-button').on('click', async function() {
        const filepicker = getFilePickerBuilder('Pick plain text files')
            .addMimeTypeFilter('text/plain')
            .addButton({
                label: 'Pick',
                callback: (nodes) => console.log('Picked', nodes),
            })
            .build()

        // You get the file nodes by the button callback, but also the pick yields the paths of the picked files
        const paths = await filepicker.pick()
    });
});

Version

On the latest Nextcloud and latest nextcloud-dialogs (6.1.1).

Attempts

Following general web advice for TypeError: (intermediate value)() is null errors, I have tried various semi-colon displacements to no avail.

Start by reproducing the supplied getFilePickerBuilder example with Nextcloud and nextcloud-dialogs 6.1.1, then inspect the implementation behind the builder and filepicker.pick(). Done means the example no longer raises the reported TypeError and the picker returns the selected file paths or invokes the button callback.