export type WritingMode = "horizontal-tb" | "vertical-rl" | "vertical-lr" | "sideways-rl" | "sideways-lr";
export type DocumentDirection = "ltr" | "rtl";
export declare enum ContentFlow {
    LeftToRight = "ltr",
    RightToLeft = "rtl",
    TopToBottom = "ttb",
    BottomToTop = "btt"
}
export declare enum TextFlow {
    LeftToRight = "ltr",
    RightToLeft = "rtl"
}
/**
 * Detects the writing mode and direction of an element.
 *
 * @remarks
 * This hook observes changes to the `dir` attribute (on body/document) and `writing-mode` style (on the element).
 * It returns the current writing mode, text direction, and derived content/text flow.
 *
 * @typeParam E - The element type.
 * @param ref - The element to observe (defaults to document.body).
 * @returns An object containing `writingMode`, `direction`, `contentFlow`, and `textFlow`.
 *
 * @example
 * ```tsx
 * const { writingMode, direction } = useWritingMode(ref.current);
 * ```
 */
export declare function useWritingMode<E extends Element>(ref?: E | null): {
    contentFlow: ContentFlow.LeftToRight;
    textFlow: TextFlow.LeftToRight;
    writingMode: WritingMode;
    direction: DocumentDirection;
} | {
    contentFlow: ContentFlow.TopToBottom;
    textFlow: TextFlow.LeftToRight;
    writingMode: WritingMode;
    direction: DocumentDirection;
} | {
    contentFlow: ContentFlow.TopToBottom;
    textFlow: TextFlow.LeftToRight;
    writingMode: WritingMode;
    direction: DocumentDirection;
} | {
    contentFlow: ContentFlow.TopToBottom;
    textFlow: TextFlow.LeftToRight;
    writingMode: WritingMode;
    direction: DocumentDirection;
} | {
    contentFlow: ContentFlow.BottomToTop;
    textFlow: TextFlow.LeftToRight;
    writingMode: WritingMode;
    direction: DocumentDirection;
} | {
    contentFlow: ContentFlow.RightToLeft;
    textFlow: TextFlow.RightToLeft;
    writingMode: WritingMode;
    direction: DocumentDirection;
} | {
    contentFlow: ContentFlow.BottomToTop;
    textFlow: TextFlow.RightToLeft;
    writingMode: WritingMode;
    direction: DocumentDirection;
} | {
    contentFlow: ContentFlow.BottomToTop;
    textFlow: TextFlow.RightToLeft;
    writingMode: WritingMode;
    direction: DocumentDirection;
} | {
    contentFlow: ContentFlow.BottomToTop;
    textFlow: TextFlow.RightToLeft;
    writingMode: WritingMode;
    direction: DocumentDirection;
} | {
    contentFlow: ContentFlow.TopToBottom;
    textFlow: TextFlow.LeftToRight;
    writingMode: WritingMode;
    direction: DocumentDirection;
};