/**
 * @ignore
 */
interface Options {
    length?: number;
    omission?: any;
    separator?: RegExp | string;
}
/**
 * @ignore
 */
interface ToStringAble {
    toString(): string;
}
/**
 * Truncates `string` if it's longer than the given maximum string length.
 * The last characters of the truncated string are replaced with the omission
 * string which defaults to "...".
 *
 * @since 5.6.0
 * @category String
 * @param str The string to truncate.
 * @param options The options object.
 * @returns Returns the truncated string.
 * @see [[replace]]
 * @example
 *
 * ```js
 * truncate('hi-diddly-ho there, neighborino')
 * // => 'hi-diddly-ho there, neighbo...'
 *
 * truncate('hi-diddly-ho there, neighborino', {
 *   'length': 24,
 *   'separator': ' '
 * })
 * // => 'hi-diddly-ho there,...'
 *
 * truncate('hi-diddly-ho there, neighborino', {
 *   'length': 24,
 *   'separator': /,? +/
 * })
 * // => 'hi-diddly-ho there...'
 *
 * truncate('hi-diddly-ho there, neighborino', {
 *   'omission': ' [...]'
 * })
 * // => 'hi-diddly-ho there, neig [...]'
 * ```
 */
export declare function truncate(str: ToStringAble, options?: Options): string;
export declare function truncate(str: string, options?: Options): string;
export default truncate;