import type { Optic, A, B, S, T, TryA, TryT } from './optic.js';
interface ValueOrA<N> extends A {
    0: TryA<this, Exclude<S<this>, undefined> | N>;
}
interface ValueOrT extends T {
    0: TryT<this, B<this>>;
}
export declare const valueOr: <B>(b: B) => Optic<'Lens', ValueOrA<B>, ValueOrT>;
export {};