declare namespace FLib {
    namespace Accordion {
        type AnimationFunction = (
            $tab: HTMLElement,
            $panel: HTMLElement,
        ) => Promise<void>;
        type Callback = ($tab: HTMLElement, $panel: HTMLElement) => void;
        type CloseCallback = (
            $tab: HTMLElement,
            $panel: HTMLElement,
            autoclose: boolean,
        ) => void;

        interface AnimationOptions {
            open: AnimationFunction;
            close: AnimationFunction;
            destroy: AnimationFunction;
        }

        interface Options {
            /** @defaultValue 'button[aria-expanded]' */
            tabSelector: string;
            /** @defaultValue false */
            allowMultipleTab: boolean;
            /** @defaultValue false */
            atLeastOneOpen: boolean;
            onOpenAtStart: Callback;
            onOpen: Callback;
            onClose: CloseCallback;
            animations: Partial<AnimationOptions>;
        }

        interface OptionsInit extends Partial<Options> {
            animations?: Partial<AnimationOptions>;
        }

        interface TabOptions extends Options {
            index: number;
        }
    }
}