export declare class ProgressBar {
    protected label?: string | undefined;
    protected readonly stdout: NodeJS.WriteStream & {
        fd: 1;
    };
    protected progress: number;
    constructor(label?: string | undefined, stdout?: NodeJS.WriteStream & {
        fd: 1;
    });
    start(): void;
    stop(): void;
    update(progress: number, label?: string): void;
    render(): void;
}