/**
 * Fails to compile when a converter does not destructure every field of its input.
 * Pass the rest of the destructured input object.
 */
export declare function assertAllFieldsMapped(_unmapped: Record<string, never>): void;
/**
 * Returns the object without the keys whose value is undefined. A key with a null value stays.
 */
export declare function withoutUndefined<T extends object>(obj: NoInfer<T>): T;
export declare function copyArray<T>(array: T[]): T[];
export declare function copyArray<T>(array: T[] | undefined): T[] | undefined;
export declare function copyArray<T>(array: T[] | null | undefined): T[] | null | undefined;
export declare function mapArray<T, R>(array: T[], fn: (item: T) => R): R[];
export declare function mapArray<T, R>(array: T[] | undefined, fn: (item: T) => R): R[] | undefined;
export declare function mapRecord<T, R>(record: {
    [key: string]: T;
} | undefined, fn: (item: T) => R): {
    [key: string]: R;
} | undefined;
//# sourceMappingURL=declarativeFields.d.ts.map