/**
 * Return the input data.
 *
 * @param data The data to return.
 * @returns The input data.
 */
export declare function identity<T>(data: T): T;
/**
 * Throw the input data.
 *
 * @param data The data to throw.
 * @throws The input data.
 */
export declare function rethrow(data: unknown): never;
/**
 * Check if the target has an own property named after the key.
 *
 * @param target The target that should have the key. Null values are also accepted.
 * @param key The key to check for on the target.
 * @returns Whether or not the key exists on the target.
 */
export declare function has(target: object | null | undefined, key: string): boolean;