import type { Mutable, TruthyObject } from '../helpers/utility-types.js';
/******************************************************************************
                                     Types
******************************************************************************/
type CollapseType<T> = {
    [K in keyof T]: T[K];
} & {};
type CopyReturn<T, O> = O extends {
    mutable: false;
} ? T : Mutable<T>;
interface CopyOptions {
    resetDates?: boolean;
    deepCloneAll?: boolean;
    mutable?: boolean;
}
/******************************************************************************
                                  Functions
******************************************************************************/
/**
 * Deep clones ONLY plain-objects (incl. null-prototype).
 *
 * - Root value must be a plain-object.
 * - Recursion descends only into plain-objects and arrays.
 * - Nested Date values are copied by epoch.
 * - `resetDates` resets all nested Date values to current time.
 * - Other nested non-plain objects are shallow-cloned by default.
 * - `deepCloneAll` deep-clones all nested object values.
 */
declare function copy<T extends TruthyObject, O extends CopyOptions | undefined = undefined>(value: T, options?: O): CollapseType<CopyReturn<T, O>>;
/******************************************************************************
                                  Functions
******************************************************************************/
export default copy;