/**
 * Chat conversation-id persistence — the SSE/Guide chat's ONLY local state.
 *
 * The stored value is the SERVER-minted conversation id echoed in the chat
 * stream's leading metadata frame; the client never generates ids. Message
 * history itself lives server-side (`chat_conversations` / `chat_messages`)
 * and is rehydrated via the history endpoint — see
 * `use-chat-history-hydration.ts`.
 *
 * Built on the lib-standard `createLocalStorageAdapter` (SSR guard,
 * try/catch, quota-failure logging, dynamic namespacing) instead of raw
 * `window.localStorage`. The namespace resolver runs on EVERY read/write, so
 * a proxy-auth identity switch mid-page automatically re-partitions the key.
 *
 * Key shape: `mingo-chat-<source>[-u-<email>].conversation`
 */
import { type LocalStorageAdapter } from '../../../utils/local-storage-adapter';
export interface PersistedChatConversation {
    conversationId: string;
}
/** One adapter per chat `source` (= platform). Memoize per mount. */
export declare function createChatConversationStorage(source: string): LocalStorageAdapter<PersistedChatConversation>;
/**
 * Sweep THIS source's stale keys: the other-identity variants (base vs
 * impersonation), and retired key shapes from before the server-minted-id
 * design (raw `mingo-chat-<source>` and versioned `-v1`/`-v2` full-history
 * stores). Boundary-aware: a hyphen-extended sibling source (`flamingo` vs
 * `flamingo-teaser`) is NOT this source's namespace and must never be swept.
 *
 * Raw storage enumeration is unavoidable here — the adapter abstraction is
 * per-key and Web Storage only exposes iteration on the raw object.
 */
export declare function pruneStaleChatConversationStorage(source: string): void;
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