export interface MessageArchiveHint {
    /** Stable title of the matched `:ConversationArchive`. */
    archiveTitle: string;
    /** Zero-based position of the matched `:Section` within the archive. */
    sectionIndex: number;
}
/**
 * Look up per-archive enrichment hints for a batch of IMAP messages.
 *
 * Given each message's RFC 5322 date, find an account-scoped
 * `:ConversationArchive {source:'email'}` whose `:Section` covers the
 * date. Returns at most one hint per message (the earliest matching
 * section by `firstMessageAt`).
 */
export declare function getMessageArchiveHints(messages: Array<{
    messageId: string | null;
    receivedAt: string;
}>, accountId: string): Promise<Map<string, MessageArchiveHint>>;
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