import { Duration } from "@tsplus/stdlib/data/Duration";
import { Schedule } from "@effect/core/io/Schedule/definition";
/**
 * A schedule that always recurs, increasing delays by summing the preceding
 * two delays (similar to the fibonacci sequence). Returns the current
 * duration between recurrences.
 * @tsplus static effect/core/io/Schedule.Ops fibonacci
 * @tsplus location "@effect/core/io/Schedule/operations/fibonacci"
 */
export declare function fibonacci(one: Duration): Schedule<readonly [Duration, Duration], never, unknown, Duration>;
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