import type { Predicate, Static } from '../types';
export declare const at: <K extends PropertyKey, T extends Predicate<any>>(key: K, predicate: T) => (value: unknown) => value is StaticAt<K, T>;
declare type StaticAt<K extends PropertyKey, T extends Predicate<any>> = Extract<Static<T>, undefined> extends never ? {
    [P in K]: Static<T>;
} : {
    [P in K]?: Static<T>;
};
export {};