/**
 * Async message stream (producer-consumer queue).
 * Used to feed user messages into the Claude subprocess stdin.
 */
export declare class Stream<T> implements AsyncIterableIterator<T> {
    private queue;
    private readResolve?;
    private readReject?;
    private isDone;
    private hasError?;
    private started;
    [Symbol.asyncIterator](): AsyncIterableIterator<T>;
    next(): Promise<IteratorResult<T>>;
    enqueue(value: T): void;
    done(): void;
    error(err: unknown): void;
    return(): Promise<IteratorResult<T>>;
}