import { Effect } from "@effect/core/io/Effect/definition";
import { Collection } from "@tsplus/stdlib/collections/Collection/definition";
import { Maybe } from "@tsplus/stdlib/data/Maybe/definition";
/**
 * Returns a successful effect with the head of the collection if the collection
 * is non-empty, or fails with the error `None` if the collection is empty.
 * @tsplus getter ets/Effect head
 * @tsplus location "@effect/core/io/Effect/operations/head"
 */
export declare function head<R, E, A>(self: Effect<R, E, Collection<A>>, __tsplusTrace?: string): Effect<R, Maybe<E>, A>;
//# sourceMappingURL=head.d.ts.map