/**
 * Find duplicates in an array of objects based on a specific key.
 * @param data The array of objects to search for duplicates.
 * @param key The key to use for finding duplicates.
 * @param message The message to include in the duplicate object.
 * @returns An array of objects containing the index and key of the duplicate.
 */
export declare function findDuplicates<T extends Record<string, any>, K extends keyof T>(data: T[], key: K, message?: string): {
    [key]: string;
    _index: number;
}[];