/**
 * Canonical form of a connection's providerDomain: trimmed, lowercased, no
 * leading "www.". Rejects a value that canonicalizes to empty (whitespace-only,
 * or a bare "www.") — `min(1)` validation passes such input, but an empty stored
 * domain silently breaks the enable-time connectionRef domain match.
 */
export declare function canonicalProviderDomain(value: string): string;