/**
 * Generic undo stack with clone-on-push semantics.
 *
 * Stores deep clones of state snapshots. Popped snapshots are returned
 * directly (no re-cloning) since they are already detached.
 */
export declare class UndoStack<S> {
  private stack;
  /** Push a deep clone of the given state onto the stack. */
  push(state: S): void;
  /** Pop and return the most recent snapshot, or undefined if empty. */
  pop(): S | undefined;
  /** Remove all snapshots. */
  clear(): void;
  get length(): number;
}
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