declare namespace Ext {
    export namespace ux {
        export interface PreviewPluginConfig {
            bodyField?: string;
            id?: string;
            pluginId?: string;
            previewExpanded?: boolean;
            stateEvents?: string | [];
        }

        export class PreviewPlugin extends Ext.plugin.Abstract  {
            public toggleExpanded(expanded?: boolean): void;
        }
    }
}