import type { HashMap } from "@effect-ts/core";
import type { Option } from "@effect-ts/core/Option";
import * as _ from "../Internal/index.js";
import type { Iso } from "../Iso/index.js";
import type { Lens } from "../Lens/index.js";
export interface At<S, I, A> {
    readonly at: (i: I) => Lens<S, A>;
}
/**
 * Lift an instance of `At` using an `Iso`
 */
export declare const fromIso: <T, S>(iso: _.Iso<T, S>) => <I, A>(sia: At<S, I, A>) => At<T, I, A>;
export declare const atRecord: <A = never>() => At<Readonly<Record<string, A>>, string, Option<A>>;
export declare const atHashMap: <K = never, A = never>() => At<Readonly<HashMap.HashMap<K, A>>, K, Option<A>>;
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