import type { Option } from "@effect-ts/core/Option";
import type { HashMap } from "@effect-ts/system/Collections/Immutable/HashMap";
import type { At } from "../At/index.js";
import * as _ from "../Internal/index.js";
import type { Iso } from "../Iso/index.js";
import type { Optional } from "../Optional/index.js";
export interface Index<S, I, A> {
    readonly index: (i: I) => Optional<S, A>;
}
export declare const fromAt: <T, J, B>(at: At<T, J, Option<B>>) => Index<T, J, B>;
/**
 * Lift an instance of `Index` using an `Iso`
 */
export declare const fromIso: <T, S>(iso: _.Iso<T, S>) => <I, A>(sia: Index<S, I, A>) => Index<T, I, A>;
export declare const indexArray: <A = never>() => Index<ReadonlyArray<A>, number, A>;
export declare const indexRecord: <A = never>() => Index<Readonly<Record<string, A>>, string, A>;
export declare const indexHashMap: <K = never, A = never>() => Index<Readonly<HashMap<K, A>>, K, A>;
//# sourceMappingURL=index.d.ts.map