/**
 * The undo/redo state.
 * @typeParam T - The type of the undo/redo data.
 */
export interface IUndoState<T> {
    /** The previous values */
    previous: T[];
    /** The current value */
    current?: T;
    /** The next values */
    next: T[];
}
/**
 * The undo/redo object. Includes the current state and methods to manipulate it.
 * @typeParam T - The type of the undo/redo data.
 */
export interface IUndoObject<T> {
    /** The current undo/redo state */
    state: IUndoState<T>;
    /**
     * Set a new current state
     * @param updater - The new value or a function that receives the current value and returns the new value
     */
    set: (updater: T | ((curr?: T) => T)) => void;
    /**
     * Reset the undo/redo history with a new initial value
     * @param current - The new initial value. If undefined, current will be unset.
     * @param previous - The previous values (optional)
     * @param next - The next values (optional)
     */
    reset: (current?: T, previous?: T[], next?: T[]) => void;
    /**
     * Undo to the previous state
     */
    undo: () => void;
    /**
     * Redo to the next state
     */
    redo: () => void;
    /**
     * Check if undo is possible
     * @returns true if there are states to undo to
     */
    canUndo: () => boolean;
    /**
     * Check if redo is possible
     * @returns true if there are states to redo to
     */
    canRedo: () => boolean;
    /**
     * Subscribe to state changes (optional, for triggering re-renders)
     * @param listener - Callback function that will be called whenever state changes
     * @returns Unsubscribe function
     */
    subscribe?: (listener: () => void) => () => void;
}
/**
 * Helper function to limit buffer size by keeping only the most recent entries.
 * @param buffer - The buffer to limit.
 * @param maxLength - Maximum allowed length.
 * @returns Limited buffer.
 * @internal
 */
export declare function limitBuffer<T>(buffer: T[], maxLength: number): T[];
/**
 * Performs an undo operation on the undo/redo state.
 * @param state - Current undo/redo state.
 * @param maxBufferLength - Maximum buffer length for history.
 * @returns New undo/redo state after undo.
 * @internal
 */
export declare function performUndo<T>(state: IUndoState<T>, maxBufferLength: number): IUndoState<T>;
/**
 * Performs a redo operation on the undo/redo state.
 * @param state - Current undo/redo state.
 * @param maxBufferLength - Maximum buffer length for history.
 * @returns New undo/redo state after redo.
 * @internal
 */
export declare function performRedo<T>(state: IUndoState<T>, maxBufferLength: number): IUndoState<T>;
/**
 * Performs a set operation on the undo/redo state.
 * @param state - Current undo/redo state.
 * @param newValue - New value to set.
 * @param maxBufferLength - Maximum buffer length for history.
 * @param equalityFn - Optional equality function to check if value changed.
 * @returns New undo/redo state after set, or null if value didn't change.
 * @internal
 */
export declare function performSet<T>(state: IUndoState<T>, newValue: T, maxBufferLength: number, equalityFn?: (a: T | undefined, b: T) => boolean): IUndoState<T> | null;
/**
 * Custom hook to manage undo/redo state using a ref (does not trigger re-renders by default).
 * @remarks
 * This hook uses useRef and does not automatically trigger component re-renders.
 * Use the subscribe method if you need to trigger re-renders on state changes, or use useUndo instead.
 * @typeParam T - The type of the undo/redo data.
 * @param initialState - The initial undo state.
 * @returns An undo object for managing state history.
 */
export declare function useUndoRef<T>(initialState?: IUndoState<T>): IUndoObject<T>;
/**
 * Custom hook to manage undo/redo state with automatic re-renders.
 * @remarks
 * This hook triggers component re-renders whenever the state changes.
 * If you don't need re-renders, use useUndoRef instead for better performance.
 * @typeParam T - The type of the state being managed.
 * @param initialState - The initial undo state.
 * @returns An undo object for managing state history with automatic re-renders.
 */
export declare function useUndo<T>(initialState?: IUndoState<T>): IUndoObject<T>;