import type { Optic, A, B, S, T, TryA, TryT } from './optic.js';
import type { ArrayOrStringExpected, StringExpected } from './errors.js';
import type { Eq } from '../utils.js';
interface AtA extends A {
    0: TryA<this, S<this> extends string ? string : S<this> extends (infer Item)[] ? Item : ArrayOrStringExpected<S<this>>>;
}
interface AtT extends T {
    0: TryT<this, S<this> extends string ? Eq<B<this>, string> extends true ? string : StringExpected<B<this>> : S<this> extends (infer Item)[] ? (Item | B<this>)[] : ArrayOrStringExpected<S<this>>>;
}
export type At = Optic<'Prism', AtA, AtT, true>;
export declare const at: (i: number) => At;
export {};