/**
 * World (LEVEL) name rule: the single source for the CLI, API and console. A world name is a
 * directory under worlds/, so only characters safe in paths and commands.
 */
export declare const WORLD_NAME_PATTERN: RegExp;
/**
 * A LEVEL that already exists in a config.env (legacy names such as
 * `My World` predate WORLD_NAME_PATTERN, #649). It is read, never written:
 * any value that names exactly one directory under worlds/ is accepted, and
 * only values that cannot be interpreted safely are rejected (path
 * separators, `.`/`..`, quotes, control characters). Writing a LEVEL still
 * requires WORLD_NAME_PATTERN.
 */
export declare const EXISTING_WORLD_NAME_PATTERN: RegExp;
/**
 * WorldName Value Object
 * A validated world directory name, used as a server's LEVEL
 */
export declare class WorldName {
    private readonly _value;
    private constructor();
    get value(): string;
    /**
     * Why a world name is invalid, or undefined when it is valid.
     * Checks the exact string; create() trims first.
     */
    static validate(value: string): string | undefined;
    static create(value: string): WorldName;
    toString(): string;
}
type ConfigEnv = Readonly<Record<string, string | undefined>>;
/**
 * The world set in a server's config.env: LEVEL, then the legacy WORLD_NAME
 * alias. Not validated, so existing configs keep working.
 */
export declare function configuredWorldName(env: ConfigEnv): string | undefined;
/**
 * The world a server uses: its configured world, else itzg's runtime default
 * 'world' (with `--universe /worlds/`, that is worlds/world).
 */
export declare function resolveWorldName(env: ConfigEnv): string;
export {};
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