import type { MaybePromise, Series, SyncSeries } from '../../controls/types.js';
export declare function filterSync<T, S extends T>(input: SyncSeries<T>, test: (value: T) => value is S): Generator<S>;
export declare function filterSync<T, S extends T>(test: (value: T) => value is S): (input: SyncSeries<T>) => Generator<S>;
export declare function filterSync<T>(input: SyncSeries<T>, test: (value: T) => boolean): Generator<T>;
export declare function filterSync<T>(test: (value: T) => boolean): (input: SyncSeries<T>) => Generator<T>;
export declare function filterAsync<T, S extends Awaited<T>>(input: Series<T>, test: (value: Awaited<T>) => value is S): AsyncGenerator<S>;
export declare function filterAsync<T, S extends Awaited<T>>(test: (value: Awaited<T>) => value is S): (input: Series<T>) => AsyncGenerator<S>;
export declare function filterAsync<T>(input: Series<T>, test: (value: Awaited<T>) => MaybePromise<boolean>): AsyncGenerator<Awaited<T>>;
export declare function filterAsync<T>(test: (value: Awaited<T>) => MaybePromise<boolean>): (input: Series<T>) => AsyncGenerator<Awaited<T>>;
/** Filters the elements by the specified test. */
export declare namespace filter {
    const sync: typeof filterSync;
    const async: typeof filterAsync;
}
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