import { TRef } from "@effect/core/stm/TRef/definition";
import { STM } from "@effect/core/stm/STM/definition/base";
/**
 * Updates the value of the variable, returning a function of the specified
 * value.
 * @tsplus static effect/core/stm/TRef.Aspects modify
 * @tsplus pipeable effect/core/stm/TRef modify
 * @tsplus location "@effect/core/stm/TRef/operations/modify"
 */
export declare function modify<A, B>(f: (a: A) => readonly [B, A]): (self: TRef<A>) => STM<never, never, B>;
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