/**
 * User Message ID Cache
 *
 * Tracks which message IDs belong to user messages within each session.
 * Used by OpenCodeEventHub to skip processing of user messages during
 * message-part-update events (so only assistant/tool parts are rendered).
 *
 * The cache is bounded at 20 entries per session to prevent unbounded growth.
 */
export declare class UserMessageIdCache {
    private userMessageIdsBySession;
    /**
     * Remember a user message ID for the given session.
     * Caps the per-session set at 20 entries by evicting the oldest entry.
     */
    remember(sessionId: string, messageId: string): void;
    /**
     * Check whether a given message/part ID belongs to a user message
     * that was previously recorded for this session.
     */
    isUserMessage(sessionId: string, messageId: string): boolean;
    /**
     * Remove all tracked message IDs for the given session.
     */
    clear(sessionId: string): void;
}
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