export declare namespace $MixAsyncIterator {
    type AG<NextOut = unknown, Return = unknown, NextIn = unknown> = [
        NextOut,
        Return,
        NextIn
    ];
    type Gen<T extends AG, B extends boolean = boolean> = {
        name: string;
        runner: AsyncIterator<T[0], T[1], T[2]>;
        /**替补元素/惰性元素
         * 意味着只有到不得不用的时候才会去使用
         */
        bench: B;
        /**当前的步伐 */
        currentStep: IteratorResult<T[0], T[1]> | undefined;
        /**偷跑的步数，默认是0
         * 偷跑意味着它始终会努力提供jumpGun个result
         * 替补元素也可以偷跑，但只有轮到它上场才能偷跑
         */
        jumpGun: number;
        /**缓存在队列中的步伐数 */
        inQueueSteps: number;
    };
    type Result<T extends AG> = {
        step: IteratorResult<T[0], T[1]>;
        from?: Gen<T>;
    };
    type ResultWithFrom<T extends AG, B extends boolean = boolean> = {
        step: IteratorResult<T[0], T[1]>;
        from: Gen<T, B>;
    };
    type Error<T extends AG> = {
        from: Gen<T>;
        reason: unknown;
    };
}