/**
 * Inputs that uniquely identify a conversation's current state for the
 * purpose of a conditional fetch. These all live on the parsed `Conversation`
 * and must be read AFTER `findConversationByUuid`'s staleness refresh — never
 * from a pre-refresh snapshot — so the validator reflects the same state the
 * response body would.
 */
export interface ConversationEtagInput {
    filePath: string;
    messageCount: number;
    timestamp: string;
}
/**
 * Derive a stable, opaque ETag for a conversation. The client never parses it;
 * it only echoes the value back via `If-None-Match`. Wrapping the inputs in a
 * hash keeps the formula changeable without the client caring.
 */
export declare function computeConversationEtag({ filePath, messageCount, timestamp, }: ConversationEtagInput): string;
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