/**
 * Converts an underline-separated string to camel case.
 * e.g. underlineToHump('hello_word') => 'helloWord'
 *
 * @param {string} target - The underline-separated string to convert.
 * @return {string} The camel case version of the input string.
 */
export declare function underlineToHump(target: string): string;