import type { TwiningConfig } from "./utils/types.js";
/**
 * Highest .twining/ on-disk format version this server can write.
 * A project whose config.yml carries a higher version was migrated by a
 * newer Twining release — this server must not write there (see
 * formatVersionRefusal), or old and new clients silently diverge.
 */
export declare const SUPPORTED_CONFIG_VERSION = 2;
/**
 * Returns a human-readable refusal reason when the on-disk format is newer
 * than this server supports, or null when writes are safe.
 */
export declare function formatVersionRefusal(config: TwiningConfig): string | null;
export declare const DEFAULT_CONFIG: TwiningConfig;
/**
 * Load config from .twining/config.yml, deep-merged with defaults.
 * If the file doesn't exist, returns DEFAULT_CONFIG.
 */
export declare function loadConfig(twiningDir: string): TwiningConfig;
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