type CaseType = 'camelCase' | 'PascalCase' | 'snake_case' | 'kebab-case' | 'CONSTANT_CASE';

/**
 * Converts an input string to camelCase.
 * e.g., "hello world" -> "helloWorld"
 * @param input The string to convert.
 * @returns The camelCased string.
 * @throws {TypeError} If input is not a string.
 */
declare function toCamelCase(input: string): string;
/**
 * Converts an input string to PascalCase (UpperCamelCase).
 * e.g., "hello world" -> "HelloWorld"
 * @param input The string to convert.
 * @returns The PascalCased string.
 * @throws {TypeError} If input is not a string.
 */
declare function toPascalCase(input: string): string;
/**
 * Converts an input string to snake_case.
 * e.g., "hello world" -> "hello_world"
 * @param input The string to convert.
 * @returns The snake_cased string.
 * @throws {TypeError} If input is not a string.
 */
declare function toSnakeCase(input: string): string;
/**
 * Converts an input string to kebab-case.
 * e.g., "hello world" -> "hello-world"
 * @param input The string to convert.
 * @returns The kebab-cased string.
 * @throws {TypeError} If input is not a string.
 */
declare function toKebabCase(input: string): string;
/**
 * Converts an input string to CONSTANT_CASE (SCREAMING_SNAKE_CASE).
 * e.g., "hello world" -> "HELLO_WORLD"
 * @param input The string to convert.
 * @returns The CONSTANT_CASED string.
 * @throws {TypeError} If input is not a string.
 */
declare function toConstantCase(input: string): string;

export { type CaseType, toCamelCase, toConstantCase, toKebabCase, toPascalCase, toSnakeCase };