/**
 * 流式打字机
 * @param speed 打字速度
 */
declare class TypeWriter {
    private speed;
    private state;
    private onEndCallback;
    private onChangeCallback;
    constructor(speed?: number);
    private processQueue;
    private init;
    append(text: string): void;
    stop(): void;
    onEnd(callback: (text?: string) => void): void;
    onChange(callback: (text?: string) => void): void;
}
export default TypeWriter;