type SiblingResolver = 'mail' | 'calendar' | 'teams' | 'drive-share';
/**
 * Classify a Zod-validated URL string by which sibling resolver it
 * belongs to. Returns `null` when the URL matches none of the known
 * resolver families (caller falls through to its own "unknown URL"
 * rejection message).
 *
 * Precondition: `raw` has been validated through `z.url()`. Calling
 * with an unvalidated string is a programmer error — `new URL(raw)`
 * will throw and the atelier rule forbids try/catch outside infra.
 */
export declare const detectSiblingResolver: (raw: string) => SiblingResolver | null;
export type { SiblingResolver };