import { DesignerLayout } from './types';
export declare class DesignerState {
    private _layout;
    private undoStack;
    private redoStack;
    private readonly MAX_UNDO;
    private readonly onStackChange;
    constructor(layout: DesignerLayout, onStackChange?: () => void);
    get layout(): DesignerLayout;
    get canUndo(): boolean;
    get canRedo(): boolean;
    snapshot(): void;
    /** Serialize current state — used by the focus-before-edit pattern */
    capture(): string;
    /** Push a pre-captured JSON string onto the undo stack */
    pushRaw(raw: string): void;
    undo(): DesignerLayout | null;
    redo(): DesignerLayout | null;
    replace(layout: DesignerLayout): void;
}