import { Equivalence } from "@tsplus/stdlib/prelude/Equivalence/definition";
import { TArray } from "@effect/core/stm/TArray/definition";
import { STM } from "@effect/core/stm/STM/definition/base";
/**
 * Get the first index of a specific value in the array or -1 if it does not
 * occur.
 * @tsplus static effect/core/stm/TArray.Aspects indexOf
 * @tsplus pipeable effect/core/stm/TArray indexOf
 * @tsplus location "@effect/core/stm/TArray/operations/indexOf"
 */
export declare function indexOf<A>(equivalence: Equivalence<A>, value: A): (self: TArray<A>) => STM<never, never, number>;
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