/**
 * Removes leading and trailing whitespace or specified characters from string.
 *
 * @param string - The string to trim
 * @param chars - The characters to trim
 * @returns The trimmed string
 *
 * @example
 * ```ts
 * trim('  abc  ');
 * // => 'abc'
 *
 * trim('-_-abc-_-', '_-');
 * // => 'abc'
 * ```
 */
export declare function trim(string: string, chars?: string): string;
/**
 * Removes leading whitespace or specified characters from string.
 *
 * @param string - The string to trim
 * @param chars - The characters to trim
 * @returns The trimmed string
 *
 * @example
 * ```ts
 * trimStart('  abc  ');
 * // => 'abc  '
 *
 * trimStart('-_-abc-_-', '_-');
 * // => 'abc-_-'
 * ```
 */
export declare function trimStart(string: string, chars?: string): string;
/**
 * Removes trailing whitespace or specified characters from string.
 *
 * @param string - The string to trim
 * @param chars - The characters to trim
 * @returns The trimmed string
 *
 * @example
 * ```ts
 * trimEnd('  abc  ');
 * // => '  abc'
 *
 * trimEnd('-_-abc-_-', '_-');
 * // => '-_-abc'
 * ```
 */
export declare function trimEnd(string: string, chars?: string): string;