export type GeneratorCompletion = {
    type: "normal" | "return" | "throw";
    value: unknown;
};
export type GeneratorChannel = {
    next(value?: unknown): Promise<IteratorResult<unknown>>;
    return(value?: unknown): Promise<IteratorResult<unknown>>;
    throw(error?: unknown): Promise<IteratorResult<unknown>>;
    snapshot(): GeneratorChannelSnapshot;
};
export type GeneratorChannelSnapshot = {
    yieldNodeId?: number;
    sent: GeneratorCompletion[];
};
export declare function createGeneratorChannel(body: (yieldValue: (value?: unknown, yieldNodeId?: number) => Promise<GeneratorCompletion>) => Promise<unknown>): GeneratorChannel;
export declare function restoreGeneratorChannel(body: Parameters<typeof createGeneratorChannel>[0], snapshot: GeneratorChannelSnapshot): GeneratorChannel;