import type { Patch, State } from "../types";
/**
 * Copies state with patches recursively. Keys with `undefined` or `null` values in patch are deleted.
 * @param prev original state
 * @param curr patches to merge
 * @returns a new patched state
 */
export declare const patch: <S extends State>(prev: Readonly<Patch<S>>, curr: Readonly<Patch<S>>) => Readonly<Patch<S>>;
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