Grav-Admin-Plugin/themes/grav/app/forms/fields/index.js

import SelectizeField, { Instance as SelectizeFieldInstance } from './selectize';
import ArrayField, { Instance as ArrayFieldInstance } from './array';
import CollectionsField, { Instance as CollectionsFieldInstance } from './collections';

export default {
    SelectizeField: {
        SelectizeField,
        Instance: SelectizeFieldInstance
    },
    ArrayField: {
        ArrayField,
        Instance: ArrayFieldInstance
    },
    CollectionsField: {
        CollectionsField,
        Instance: CollectionsFieldInstance
    }
};