/**
 * Duplex byte stream for testing.
 * If this stream is connected to another stream, use `push` to send data, and `assertReceivedAsync` to assert the
 * received data.
 */
export declare class TestStream {
    #private;
    static assertConnectivity(stream1: TestStream, stream2: TestStream, { timeout }?: {
        timeout?: number;
    }): Promise<void>;
    readonly readable: ReadableStream<Uint8Array<ArrayBufferLike>>;
    readonly writable: WritableStream<Uint8Array<ArrayBufferLike>>;
    push(data: Uint8Array | string): void;
    assertReceivedAsync(data: Uint8Array | string, { timeout }?: {
        timeout?: number;
    }): Promise<void>;
}
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