/**
 * Adds the specified string to the end of the string until it reaches the specified length.
 *
 * @param string_ - The original string to apply padding
 * @param targetLength - The target length after padding
 * @param padString - The string to use for padding
 * @returns The string after padding has been applied
 */
export declare const padEnd: (string_: string, targetLength: number, padString: string) => string;