/**
 * Per-file view rotation for image viewers — degrees (0/90/180/270) keyed by
 * file id, held in memory. Shared between an inline gallery and its fullscreen
 * modal so a rotation survives prev/next navigation and open/close while the
 * gallery is mounted. View-only: it is a render transform, never a mutation of
 * the stored file.
 */
export interface ImageRotation {
    rotations: Record<string, number>;
    rotationFor: (id: string) => number;
    /** Advance a quarter-turn; `step` 1 = clockwise, -1 = counter-clockwise. */
    rotate: (id: string, step?: 1 | -1) => void;
}
export declare function useImageRotation(): ImageRotation;