import type { CamelCaseToKebabCase, KebabCaseToCamelCase } from './types.js';
/**
 * Converts a kebab-case string to camelCase.
 * @param string - The kebab-case string to convert.
 * @returns The camelCase string.
 */
export declare function kebabCaseToCamelCase<T extends string>(string: T): KebabCaseToCamelCase<T>;
/**
 * Converts a camelCase string to kebab-case.
 * @param input - The camelCase string to convert.
 * @returns The kebab-case string.
 */
export declare function camelCaseToKebabCase<T extends string>(input: T): CamelCaseToKebabCase<T>;
/**
 * Converts a string to Title Case.
 * - Capitalizes the first letter of each major word.
 * - Keeps articles, conjunctions, and short prepositions in lowercase unless they are the first word.
 *
 * @param input - The string to convert.
 * @returns The formatted title case string.
 */
export declare function toTitleCase(input: string): string;
/**
 * Converts a string to Sentence Case.
 * - Capitalizes only the first letter of the sentence.
 * - Retains case of proper nouns.
 *
 * @param input - The string to convert.
 * @returns The formatted sentence case string.
 */
export declare function toSentenceCase(input: string): string;
export declare function capitalize<T extends string>(text: T): Capitalize<T>;
export declare function lowercase<T extends string>(text: T): Lowercase<T>;
export declare function uppercase<T extends string>(text: T): Uppercase<T>;