/** Known client identifiers. Used for soft validation — unrecognized clients are warned, not rejected. */
export declare const KNOWN_CLIENTS: Set<string>;
/** Returns true if the client name is recognized. 'all' is always valid. */
export declare function isKnownClient(client: string): boolean;
/** Strong path-prefix patterns per client. Only unambiguous signals — no bare filenames. */
export declare const CLIENT_CONTENT_PATTERNS: Record<string, RegExp[]>;
export declare const CLIENT_TAG_PREFIX = "client:";
/** Build a `client:X` tag from a client name. */
export declare function clientTag(client: string): string;
/**
 * Scan content and guidance for client-specific patterns.
 * Returns a single client name if exactly one client is detected, or null
 * if the content is universal or ambiguous (mentions multiple clients).
 */
export declare function detectClient(content: string, guidance: string): string | null;
/** Extract all `client:X` values from a tags array. */
export declare function getClientTags(tags: string[]): string[];
/**
 * Determine whether a note (by its tags) should be visible to a given client.
 *
 * Rules:
 * 1. No `client:` tags → universal, visible to all
 * 2. Has `client:all` → visible to all
 * 3. Otherwise → visible only if querying client matches a `client:` tag
 */
export declare function isVisibleToClient(tags: string[], client: string): boolean;
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