/**
 * Normalize the application base path.
 * @param basePath The base path to normalize
 * @example normalizeAppBasePath('admin') // returns '/admin/'
 * @example normalizeAppBasePath('/admin') // returns '/admin/'
 * @example normalizeAppBasePath('admin/') // returns '/admin/'
 * @example normalizeAppBasePath('/admin/') // returns '/admin/'
 * @returns The normalized base path
 */
export declare function normalizeAppBasePath(basePath: string | undefined): string;