/**
 * Uppercase first character of the input string
 *
 * @param {string|undefined} [str] input string
 * @returns {string}
 */
export function upperCaseFirst(str?: string | undefined): string;
/**
 * Lowercase first character of the input string
 *
 * @param {string|undefined} [str] input string
 * @returns {string}
 */
export function lowerCaseFirst(str?: string | undefined): string;
/**
 * Hash the input string
 *
 * @param {string} string
 * @returns {number}
 */
export function getHashForString(string: string): number;
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