declare module '@tiptap/core' {
    interface Commands<ReturnType> {
        underline: {
            /**
             * Set an underline mark
             */
            setUnderline: () => ReturnType;
            /**
             * Toggle an underline mark
             */
            toggleUnderline: () => ReturnType;
            /**
             * Unset an underline mark
             */
            unsetUnderline: () => ReturnType;
        };
    }
}
export declare const underline: import("ricos-types").RicosMarkExtension<{
    HTMLAttributes: Record<string, unknown>;
}, unknown>;
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