import type { Db } from '../storage/database.js';
import type { EventBus } from './events.js';
import type { ThreadBranch, Message } from '../types.js';
export declare class BranchService {
    private readonly db;
    private readonly events;
    constructor(db: Db, events: EventBus);
    /** Create a branch from any message. Returns the new branch. */
    create(parentMessageId: number, createdBy: string, name?: string | null): ThreadBranch;
    /** Get a branch by ID. */
    getById(id: number): ThreadBranch | null;
    /** List branches, optionally filtered by parent message. */
    list(parentMessageId?: number): ThreadBranch[];
    /** Get messages in a specific branch. */
    branchMessages(branchId: number): Message[];
    /** Count total branches. */
    count(): number;
}
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