/**
 * Step the displayed zoom (+/−) along the Chrome PDF preset ladder.
 */
export declare const scaleCanvas: (command: '+' | '-') => void;
export declare const applyCanvasZoomDelta: (deltaPercent: number) => void;
/**
 * Set displayed zoom to an exact percent (toolbar presets: 50, 75, 100, … 200).
 */
export declare const setCanvasScalePercentage: (value: number) => void;
/**
 * Reset canvas zoom to the default fit percentage and re-center the viewport.
 *
 * Always toggle `canvasDragged` so the viewport watcher runs `initViewportPosition`.
 * Setting percentage alone only applies a relative size adjustment, and clearing an
 * already-false drag flag is a Zustand no-op — both of which left the fit button looking broken.
 */
export declare const resetCanvas: () => void;
export default _default;
declare function _default(): {
    canvasScalePercentage: string;
    setCanvasScalePercentage: typeof setCanvasScalePercentage;
    scaleCanvas: typeof scaleCanvas;
    applyCanvasZoomDelta: typeof applyCanvasZoomDelta;
    resetCanvas: typeof resetCanvas;
};