/**
 * Snapshot-based undo/redo stack. `push` records a new state and clears the
 * redo branch; `undo`/`redo` move the cursor and return the restored value.
 *
 * @typeParam T - The snapshot type; store immutable snapshots (or clones),
 * never live references that later mutate.
 * @example
 * const edits = new EditStack(initialLayout)
 * edits.push(nextLayout)
 * const restored = edits.undo()
 */
export declare class EditStack<T> {
    private readonly past;
    private readonly future;
    private current;
    constructor(initial: T);
    get value(): T;
    get canUndo(): boolean;
    get canRedo(): boolean;
    apply(next: T): void;
    undo(): T;
    redo(): T;
}
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