import { type Maybe } from '../value/maybe.type';
export type CopySelectModelFieldsConfig<T = unknown> = Partial<CopyModelFieldsConfig<T>>;
export type CopyModelFieldsConfig<T = unknown> = {
    [K in keyof T]: Maybe<CopyModelFieldConfig>;
};
export interface CopyModelFieldConfig<V = unknown> {
    /**
     * Default value if not presented. If default is not defined and there is no value, the key will be ignored entirely.
     */
    default?: V;
}
/**
 * Used for copying one field from one partial object to a target object.
 */
export type CopyModelFieldFunction<T> = (from: Partial<T>, target: Partial<T>) => void;
/**
 * Creates a function that copies a single field from a partial source object to a partial target object.
 *
 * If the field exists on the source, its value (or the configured default if null) is assigned to the target.
 * If the field does not exist on the source but a default is configured, the default is used.
 * Otherwise, the target is left unchanged.
 *
 * @param key - The property key to copy
 * @param inputConfig - Optional config with a default value for the field
 * @returns A function that copies the field from source to target
 */
export declare function makeCopyModelFieldFunction<T extends object>(key: keyof T, inputConfig?: Maybe<CopyModelFieldConfig>): CopyModelFieldFunction<T>;