import { Maybe } from "@tsplus/stdlib/data/Maybe/definition";
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 modifySome
 * @tsplus pipeable effect/core/stm/TRef modifySome
 * @tsplus location "@effect/core/stm/TRef/operations/modifySome"
 */
export declare function modifySome<A, B>(def: B, pf: (a: A) => Maybe<readonly [B, A]>): (self: TRef<A>) => STM<never, never, B>;
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