/**
 * Formats a given input string with numeric placeholders.
 * @example
 * ```ts
 * // returns "Hello World"
 * formatString("{0} {1}", ["Hello", "World"]);
 * ```
 * @param string - The input string with placeholders.
 * @param formatArguments - An array of strings to place into the placeholders.
 * @returns The formatted string.
 */
export declare const formatString: (string: string, ...formatArguments: Array<string>) => string;
/**
 * Formats a given input string with alphanumeric placeholders.
 * @example
 * ```ts
 * // returns "Hello World"
 * formatString("{first} {second}", {first:"Hello", second:"World"});
 * ```
 * @param string - The input string with placeholders.
 * @param parameters - A hash of parameters to place in the placeholders.
 * @returns The formatted string.
 */
export declare const formatStringTemplate: (string: string, parameters: Record<string, string | undefined>) => string;