import type { Prefix, Suffix } from '@toolbox-ts/types/defs/string';
/**
 * Capitalizes the first letter of a string.
 * @example
 * ```ts
 * capitalize('hello') // 'Hello'
 * capitalize('h')     // 'H'
 * ```
 */
export declare const capitalize: <S extends string = string>(str: S) => Capitalize<S>;
/**
 * Uncapitalizes the first letter of a string.
 * @example
 * ```ts
 * uncapitalize('Hello') // 'hello'
 * uncapitalize('H')     // 'h'
 * ```
 */
export declare const uncapitalize: <S extends string = string>(str: S) => Uncapitalize<S>;
/**
 * Prefixes a string with another string.
 *
 * @example
 * ```ts
 * prefix('pre', '-fix') // 'pre-fix'
 * prefix('pre-', 'fix') // 'pre-fix'
 * ```
 */
export declare const prefix: <P extends string = string, S extends string = string>(pre: P, str: S) => Prefix<P, S>;
/**
 * Suffixes a string with another string.
 *
 * @example
 * ```ts
 * suffix('suf-', 'fix') // 'suf-fix'
 * suffix('suf', '-fix') // 'suf-fix'
 * ```
 */
export declare const suffix: <P extends string = string, S extends string = string>(str: S, suf: P) => Suffix<S, P>;