export interface RepoMessageStatus {
    type?: string;
    reason?: string;
}
export interface RepoMessageContent {
    type: string;
    text?: string;
    [key: string]: unknown;
}
export interface RepoMessage {
    id?: string;
    role?: string;
    status?: RepoMessageStatus;
    content?: string | RepoMessageContent[];
    metadata?: Record<string, unknown>;
    createdAt?: Date | string | number;
    [key: string]: unknown;
}
/** Entry in `repo.messages` — may be flat or wrapped `{ message: RepoMessage }`. */
export interface RepoEntry {
    parentId?: string | null;
    message?: RepoMessage;
    id?: string;
    role?: string;
    status?: RepoMessageStatus;
    content?: string | RepoMessageContent[];
    [key: string]: unknown;
}
/** Minimal structure of the normalised thread repository used by AssistantChat. */
export interface NormalizedRepo {
    messages?: RepoEntry[];
    headId?: string;
    queuedMessages?: unknown[];
    [key: string]: unknown;
}
export declare function getRepoMessages(repo: NormalizedRepo | null | undefined): RepoEntry[];
export declare function getRepoMessage(entry: RepoEntry): RepoMessage | null;
export declare function getAssistantRunDurationMs(message: {
    metadata?: unknown;
} | null | undefined): number | null;
export declare function withLastAssistantRunDuration<T extends NormalizedRepo>(repo: T, durationMs: number | null | undefined): T;
/**
 * Collapse duplicate message ids before a repository is handed to
 * `threadRuntime.import()`. assistant-ui's `MessageRepository` throws
 * "MessageRepository(performOp/link): A message with the same id already exists
 * in the parent tree" when the imported messages contain the same id more than
 * once (Sentry AGENT-NATIVE-BROWSER-2Q). Duplicate ids are never valid thread
 * data — they come from optimistic+echo races, streaming reconnect replays, or
 * multi-tab merges — so keep only the LAST occurrence of each id (the most
 * recent, most complete copy). parentId references stay valid because the
 * surviving entry keeps the same id.
 *
 * Returns the input unchanged (same reference) when there are no duplicates, so
 * the overwhelmingly common no-dupe case is a cheap no-op with zero behavioural
 * change for normal threads.
 */
export declare function dedupeRepoMessagesById<T extends NormalizedRepo>(repo: T | null | undefined): T | null | undefined;
export declare function dropEmptyAssistantMessages<T extends NormalizedRepo>(repo: T | null | undefined): T | null | undefined;
export declare function isAssistantMessageTerminal(message: RepoMessage | null): boolean;
export declare function repoHasAssistantMessage(repo: NormalizedRepo | null | undefined): boolean;
export declare function shouldImportServerThreadData(currentRepo: NormalizedRepo | null | undefined, incomingRepo: NormalizedRepo | null | undefined): boolean;
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