import type { IOutput } from './io/output';
/**
 * Command history. Also maintains a current index in the history for scrolling through it.
 */
export declare class History {
    add(command: string): void;
    at(index: number): string | null;
    clear(): void;
    scrollCurrent(next: boolean): string | null;
    setMaxSize(maxSize: number): void;
    write(output: IOutput): void;
    private _history;
    private _current;
    private _ignoreInitialWhitespace;
    private _ignoreDuplicates;
    private _maxSize;
}