import { Chat } from '../models';
/**
 * Merge previously persisted thread messages with an incoming delta-only
 * payload by finding the longest overlap and appending only the new tail.
 * This is effectively the inverse of `_extractMessageDelta`.
 * @public
 */
export declare function mergeMessagesForThread(saved?: Chat.Api.Message[], incoming?: Chat.Api.Message[]): Chat.Api.Message[];
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