import { GUI as OriginalGUI } from 'lil-gui';
declare module "lil-gui" {
    interface Controller {
        className(cls: string): this;
    }
}
export interface Controller {
    className(cls: string): this;
}
export declare class GUI extends OriginalGUI {
    constructor(options?: ConstructorParameters<typeof OriginalGUI>[0]);
    private _addCustomStyles;
}