export interface HistoryEntry {
    role: 'user' | 'assistant';
    content: string;
}
export declare function appendMessage(user: string, role: HistoryEntry['role'], content: string): void;
export declare function getHistory(user: string): HistoryEntry[];
export declare function clearHistory(user: string): void;
export declare function formatTranscript(history: HistoryEntry[]): string;
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