/**
 * Converts a string to camelCase.
 *
 * @example
 * toCamelCase("Hello World") // "helloWorld"
 * toCamelCase("kebab-case-string") // "kebabCaseString"
 * toCamelCase("") // ""
 *
 * @param str The string to convert to camelCase.
 * @returns The camelCase version of the input string.
 */
export declare function toCamelCase(str: string): string;