import type { FlowSource } from "./FlowSource";
/**
 * return a transform stream that concats streams from sources
 * don't get confused with mergeStream
 * concats     : returns a TransformStream, which also concats upstream
 * concatStream: returns a ReadableStream, which doesnt have upstream
 */
export declare const concats: {
    <T>(streams?: FlowSource<FlowSource<T>>): TransformStream<T, T>;
};
/**
 * return a readable stream that concats streams from sources
 * don't get confused with concats
 * concatStream: returns a ReadableStream, which doesnt have upstream
 * concats     : returns a TransformStream, which also concats upstream
 */
export declare const concatStream: <T>(srcs?: FlowSource<FlowSource<T>>) => ReadableStream<T>;