declare type Awaitable<T> = T | Promise<T>;
declare type ForOfAwaitable<T> = Iterable<T> | AsyncIterable<T>;
/**
 * Alternates items from the first and second iterable in the output iterable, until either input runs out of items.
 */
export declare function interleave<X, Y>(xs: Iterable<X>, ys: Iterable<Y>): IterableIterator<X | Y>;
/**
 * It's like interleave, but will flatten items of the second (async) iterable.
 */
export declare function aInterleaveFlattenSecond<X, Y>(xs: Iterable<X>, ys: Iterable<AsyncIterable<Y>>): AsyncIterableIterator<X | Y>;
export declare function map<A, B>(f: (a: A) => B): (iterable: Iterable<A>) => IterableIterator<B>;
export declare function aMap<A, B>(f: (a: A) => Awaitable<B>): (iterable: ForOfAwaitable<A>) => AsyncIterableIterator<B>;
export declare function join(iterable: Iterable<string>): IterableIterator<string>;
export declare function aJoin(iterable: ForOfAwaitable<string>): AsyncIterableIterator<string>;
export {};
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