import type { Curried } from '../../compositions/curry.js';
import type { MaybePromise, Series, SyncSeries } from '../../controls/types.js';
declare const _syncUniqueBy: <T>(input: SyncSeries<T>, key: (value: T) => unknown) => Generator<T>;
declare const _asyncUniqueBy: <T>(input: Series<T>, key: (value: Awaited<T>) => MaybePromise<unknown>) => AsyncGenerator<Awaited<T>>;
export declare function uniqueBySync<T>(...args: Parameters<typeof _syncUniqueBy<T>>): ReturnType<typeof _syncUniqueBy<T>>;
export declare function uniqueBySync<T>(...args: Parameters<Curried<typeof _syncUniqueBy<T>>>): ReturnType<Curried<typeof _syncUniqueBy<T>>>;
export declare function uniqueByAsync<T>(...args: Parameters<typeof _asyncUniqueBy<T>>): ReturnType<typeof _asyncUniqueBy<T>>;
export declare function uniqueByAsync<T>(...args: Parameters<Curried<typeof _asyncUniqueBy<T>>>): ReturnType<Curried<typeof _asyncUniqueBy<T>>>;
export declare namespace uniqueBy {
    const sync: typeof uniqueBySync;
    const async: typeof uniqueByAsync;
}
export {};
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