export type FlipState = 'idle' | 'dragging' | 'animating' | 'zoomed-panning';
export type FlipEvent = 'grab' | 'release' | 'settle' | 'panStart' | 'panEnd' | 'flip';
/** Pure transition: the next state, or null if `event` is illegal from `state`. */
export declare function nextState(state: FlipState, event: FlipEvent): FlipState | null;
/** Stateful holder around `nextState`; illegal events are ignored. */
export declare class FlipMachine {
    #private;
    constructor(initial?: FlipState);
    get state(): FlipState;
    /** Apply `event`; returns the new state, or null (no-op) if the event was illegal. */
    send(event: FlipEvent): FlipState | null;
}