Handle storage with a callback function.

The ValueCallbackStore extension can be configured with the ValueCallbackStoreOptions object. 

import { defineFilePond } from 'filepond';
import { locale } from 'filepond/locales/en-gb.js';
import { ValueCallbackStore } from 'filepond/extensions/value-callback-store.js';

defineFilePond({
    locale,
    extensions: [
        // Add the ValueCallbackStore extension and configure with ValueCallbackStoreOptions object
        ValueCallbackStore
    ]
})