import { type Ord } from "rambda";
import { sflow, type FlowSource } from "./index";
interface MergeBy {
    <T>(ordFn: (input: T) => Ord, srcs: FlowSource<FlowSource<T>>): sflow<T>;
    <T>(ordFn: (input: T) => Ord): {
        (srcs: FlowSource<FlowSource<T>>): sflow<T>;
    };
}
/**
 * merge multiple stream by ascend order, assume all input stream is sorted by ascend
 * output stream will be sorted by ascend too.
 *
 * if one of input stream is not sorted by ascend, it will throw an error.
 *
 * @param ordFn a function to get the order of input
 * @param srcs a list of input stream
 * @returns a new stream that merge all input stream by ascend order
 * @deprecated use {@link mergeStreamsByAscend}
 */
export declare const mergeAscends: MergeBy;
/**
 * merge multiple stream by ascend order, assume all input stream is sorted by ascend
 * output stream will be sorted by ascend too.
 *
 * if one of input stream is not sorted by ascend, it will throw an error.
 *
 * @param ordFn a function to get the order of input
 * @param srcs a list of input stream
 * @returns a new stream that merge all input stream by ascend order
 * @deprecated use {@link mergeStreamsByAscend}
 */
export declare const mergeDescends: MergeBy;
export {};