/** Case-sensitive alphabet used only for generated public codes. */
export declare const SLUG_ALPHABET = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
/** Generated codes start short and grow only after repeated collisions. */
export declare const DEFAULT_SLUG_LENGTH = 3;
export declare const MAX_GENERATED_SLUG_LENGTH = 96;
export declare const COLLISION_ATTEMPTS_PER_LENGTH = 8;
export declare const SYSTEM_RESERVED_PUBLIC_SLUGS: Set<string>;
export type SlugTokenFactory = (length: number) => string;
export declare function randomToken(length?: number): string;
/**
 * Return the generated-code length for a zero-based collision attempt.
 * Eight atomic insert collisions at one size move allocation to the next size.
 */
export declare function adaptiveSlugLength(attempt: number, requestedLength?: number): number;
export declare function normalizeGeneratedSlugLength(length?: number): number;
/** Friendly aliases and generated codes share one root-path slug syntax. */
export declare function normalizeSlug(slug: string, additionalReserved?: Iterable<string>): string;