/**
 * `UnifiedChatMessage` (what the chat state produces, and what a host like
 * Mingo hands in) → `Message` (what the thread renders).
 *
 * The two types overlap but are not the same: this step resolves the role's
 * default name and avatar, folds `segments` back into `content`, and stamps a
 * timestamp for rows that arrived without one. So it is a REBUILD, and a
 * rebuild names every field it keeps — which makes "a new field was added
 * upstream" a silent data loss by default, not a compile error.
 *
 * It has cost us that twice already. `hidden` was dropped here, and a synthetic
 * directive the reader was never meant to see rendered as an ordinary bubble.
 * Then Guide Mode's `sources` / `refs` were dropped here, and every answer lost
 * its citation strip while its cards fell back to being titled by their own id
 * — with the decoder, the reducer and the renderer all working correctly, which
 * is exactly why it took a screenshot diff to find.
 *
 * Hence this module: pure, cheap to render-free test, and the one place the
 * pass-through list is pinned.
 */
import type { Message } from '../types/message.types';
import type { UnifiedChatMessage } from '../types/unified-chat-state.types';
export interface HostMessageMapOptions {
    /** Display name for `user` rows when the host supplies none. */
    userName?: string;
    /** Avatar for `user` rows when the host supplies none. */
    userAvatar?: string;
    /**
     * Fallback timestamps for rows that carry none, keyed by message id. Mutated:
     * a row must keep the SAME fallback across renders, or its bubble re-stamps
     * itself on every keystroke elsewhere in the thread.
     */
    timestampCache: Map<string, Date>;
}
export declare function mapHostMessage(m: UnifiedChatMessage, options: HostMessageMapOptions): Message;
/**
 * Drop cached fallback timestamps for messages no longer in the thread, so the
 * map cannot grow unbounded across a long-lived session.
 */
export declare function pruneTimestampCache(timestampCache: Map<string, Date>, liveIds: Set<string>): void;
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