export declare const MAX_PINCH_DELTA_PX = 40;
export declare const ZOOM_GESTURE_IDLE_RESET_MS = 150;
export type ZoomGestureDevice = {
    pinch: boolean;
    lastEventAtMs: number;
};
export declare function isPinchZoomDelta(deltaY: number): boolean;
export declare function resolveZoomGestureDevice(args: {
    deltaY: number;
    deltaMode: number;
    ctrlKey: boolean;
    metaKey: boolean;
    atMs: number;
    previous: ZoomGestureDevice | null;
}): ZoomGestureDevice;
export declare const MOUSE_WHEEL_NOTCH_PX = 100;
export declare const ZOOM_STEP_PER_NOTCH = 1.1;
export declare const PINCH_ZOOM_SENSITIVITY = 0.0075;
export declare const MAX_ZOOM_FACTOR_PER_FRAME = 1.6;
export declare const WHEEL_LINE_HEIGHT_PX = 16;
export declare const WHEEL_PAGE_HEIGHT_PX = 800;
export declare function normalizeWheelDeltaPx(delta: number, deltaMode: number): number;
export declare function zoomFactorForWheelDelta(deltaY: number, pinch: boolean): number;
export declare function clampZoomFactor(factor: number): number;
export declare function accumulateZoomFactor(pendingFactor: number, deltaY: number, pinch: boolean): number;