/**
 * Formats a string using placeholder tokens.
 *
 * If the first argument is a string, it is treated as a format string that
 * specifies placeholders for the subsequent arguments, which will be inserted
 * into the string in place of the placeholders. The placeholders are
 * specified using '%s' for string, '%d' for number, and '%j' for JSON.
 *
 * If the first argument is not a string, all arguments will be inspected and
 * concatenated into a space-separated string.
 *
 * @param {string|any} f - The format string or object to be formatted.
 * @param {...any} args - The values to be inserted into the format string.
 * @returns {string} The formatted string.
 *
 * @example
 * format('%s %s', 'hello', 'world'); // 'hello world'
 * format('%d %s', 42, 'answer'); // '42 answer'
 * format('%j', { foo: 'bar' }); // '{'foo':'bar'}'
 * format('no placeholders', 'needed'); // 'no placeholders needed'
 */
export function format(f: string | any, ...args: any[]): string;
export default format;