import { TArray } from "@effect/core/stm/TArray/definition";
import { Predicate } from "@tsplus/stdlib/data/Predicate";
import { USTM } from "@effect/core/stm/STM/definition/base";
/**
 * Get the index of the first entry in the array matching a predicate.
 * @tsplus fluent ets/TArray indexWhere
 * @tsplus location "@effect/core/stm/TArray/operations/indexWhere"
 */
export declare function indexWhere_<A>(self: TArray<A>, f: Predicate<A>): USTM<number>;
/**
 * Get the index of the first entry in the array matching a predicate.
 * @tsplus static ets/TArray/Aspects indexWhere
 * @tsplus pipeable ets/TArray indexWhere
 * @tsplus location "@effect/core/stm/TArray/operations/indexWhere"
 */
export declare const indexWhere: <A>(f: import("@tsplus/stdlib/data/Predicate").Predicate<A>) => (self: import("../definition").TArray<A>) => import("../../STM").USTM<number>;
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