import { Schedule } from "@effect/core/io/Schedule/definition";
/**
 * Returns a new schedule that packs the input and output of this schedule
 * into the first element of a tuple. This allows carrying information through
 * this schedule.
 * @tsplus getter effect/core/io/Schedule first
 * @tsplus location "@effect/core/io/Schedule/operations/first"
 */
export declare function first<State, Env, In, Out, X>(self: Schedule<State, Env, In, Out>): Schedule<readonly [State, void], Env, readonly [In, X], readonly [Out, X]>;
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