import { MarkdownEditorSelection, MarkdownTextChange } from './types';
export interface MarkdownHistoryStep {
    changes: MarkdownTextChange[];
    selection: MarkdownEditorSelection | null;
}
export declare class MarkdownHistory {
    private done;
    private undone;
    private readonly limit;
    private readonly delay;
    constructor(limit?: number, delay?: number);
    get canUndo(): boolean;
    get canRedo(): boolean;
    clear(): void;
    /** A local edit of `doc`. */
    record(doc: string, changes: readonly MarkdownTextChange[], before: MarkdownEditorSelection | null, after: MarkdownEditorSelection | null, group: string | null, time?: number): void;
    /** Ends the current typing run: the next edit starts a step of its own. */
    seal(): void;
    undo(): MarkdownHistoryStep | null;
    redo(): MarkdownHistoryStep | null;
    /** A change from elsewhere was applied to the current document, `docLength` long before it. */
    rebase(remote: readonly MarkdownTextChange[], docLength: number): void;
}