import { Difference } from 'microdiff';
import { ClipJSON, ProjectJSON, StudioTrackJSON } from '../json-serialization';
export interface HistoryOptions {
    maxSize?: number;
}
export interface HistoryState {
    clips: Record<string, ClipJSON>;
    tracks: StudioTrackJSON[];
    settings: any;
}
export declare class HistoryManager {
    private past;
    private future;
    private lastState;
    private maxSize;
    constructor(options?: HistoryOptions);
    private projectToHistoryState;
    /**
     * Initialize history with the starting state
     */
    init(state: ProjectJSON): void;
    /**
     * Push a new state to history. Calculates the diff from the last state.
     */
    push(newState: ProjectJSON): void;
    /**
     * Undo the last action. Returns the patches and the new target state.
     */
    undo(currentState: ProjectJSON): {
        patches: Difference[];
        state: HistoryState;
    } | null;
    /**
     * Redo the next action. Returns the patches and the new target state.
     */
    redo(currentState: ProjectJSON): {
        patches: Difference[];
        state: HistoryState;
    } | null;
    /**
     * Apply patches to an object.
     */
    private applyPatches;
    canUndo(): boolean;
    canRedo(): boolean;
}