export type DeepPartial<T> = T extends (...args: unknown[]) => unknown ? T : T extends readonly (infer U)[] ? readonly DeepPartial<U>[] : T extends object ? {
    [K in keyof T]?: DeepPartial<T[K]>;
} : T;
/**
 * Deep merge where overrides win.
 * Arrays are replaced.
 */
export declare function deepMerge<A extends object, B extends object>(base: A, override?: B): A & B;
export type Preset<Id extends string, T extends Record<string, unknown>, Base extends DeepPartial<T>> = <O extends DeepPartial<T>>(override?: O) => Record<Id, Base & O>;
export declare function presetFor<Ids extends string, T extends Record<string, unknown>>(): <const Id extends Ids, const Base extends DeepPartial<T>>(id: Id, base: Base) => Preset<Id, T, Base>;