import { ChangeSet, ChangeDesc, Transaction, EditorSelection } from "../../state/src";
declare class Item {
    readonly map: ChangeSet<ChangeDesc>;
    readonly inverted: ChangeSet | null;
    readonly selection: EditorSelection | null;
    constructor(map: ChangeSet<ChangeDesc>, inverted?: ChangeSet | null, selection?: EditorSelection | null);
    readonly isChange: boolean;
}
export declare const enum ItemFilter {
    OnlyChanges = 0,
    Any = 1
}
declare type Branch = ReadonlyArray<Item>;
export declare const enum PopTarget {
    Done = 0,
    Undone = 1
}
export declare class HistoryState {
    readonly done: Branch;
    readonly undone: Branch;
    private readonly prevTime;
    private readonly prevUserEvent;
    private constructor();
    resetTime(): HistoryState;
    addChanges(changes: ChangeSet, inverted: ChangeSet | null, selection: EditorSelection, time: number, userEvent: string | undefined, newGroupDelay: number, maxLen: number): HistoryState;
    addMapping(map: ChangeSet<ChangeDesc>, maxLen: number): HistoryState;
    canPop(done: PopTarget, only: ItemFilter): boolean;
    pop(done: PopTarget, only: ItemFilter, transaction: Transaction, maxLen: number): {
        transaction: Transaction;
        state: HistoryState;
    };
    eventCount(done: PopTarget, only: ItemFilter): number;
    static empty: HistoryState;
}
export {};