import { Mapper } from "../collections";
import { Transducer } from "./transducer";
export declare class FlatMapTransducer<A, B> implements Transducer<A, B> {
    mapper: Mapper<A, Iterable<B> | AsyncIterable<B>>;
    constructor(mapper: Mapper<A, Iterable<B> | AsyncIterable<B>>);
    async_(iterable: AsyncIterable<A>): AsyncIterable<B>;
    sync(iterable: Iterable<A>): Iterable<B>;
}
export declare function flatMap<A, B>(mapper: Mapper<A, Iterable<B> | AsyncIterable<B>>): FlatMapTransducer<A, B>;