/**
 * 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;
/**
 * Format a type name for error messages
 *
 * @param {undefined|{ group?: string, name?: string, type?: string }} type
 * @returns {string}
 */
export function stringFormatNameForError(type: undefined | {
    group?: string;
    name?: string;
    type?: string;
}): string;
/**
 * Format a full relation name
 *
 * @param {string} ownName
 * @param {string} inverseName
 * @param {string} ownKey
 * @param {string} inverseKey
 * @returns {string}
 */
export function stringFormatRelation(ownName: string, inverseName: string, ownKey: string, inverseKey: string): string;
/**
 * Combine the messages of the provided errors and throw a new error.
 *
 * Early returns if an empty array is provided.
 *
 * Other supported properties:
 * - messages: expected to be a string[]
 *
 * @param {Array<import("@compas/stdlib").AppError>} errors
 * @returns {void}
 */
export function errorsThrowCombinedError(errors: Array<import("@compas/stdlib").AppError>): void;