import type { OAuthTokens, OAuthTokenSnapshot, RefreshCapableTokenStore, TokenStore } from "./types.js";
/** Runtime capability guard for stores that can refresh without lost updates. */
export declare function isRefreshCapableTokenStore(store: TokenStore): store is RefreshCapableTokenStore;
/**
 * Validate and detach a token row crossing an application-provided store
 * boundary. Returns null for malformed rows without invoking property getters.
 */
export declare function normalizeStoredOAuthTokens(value: unknown): OAuthTokens | null;
/** Validate and detach a revisioned token-store snapshot without invoking getters. */
export declare function normalizeOAuthTokenSnapshot(value: unknown): OAuthTokenSnapshot | null;
//# sourceMappingURL=token-utils.d.ts.map