import type { ContentBlock } from '../types/blocks.js';
/**
 * Derive a short title from a user_input event's content. Used by both
 * `DefaultSessionStore.summarize()` (offline summary rebuild) and
 * `FileSessionWriter.observeForSummary()` (live tracking), so it lives
 * here to avoid a bidirectional import between those two modules.
 */
export declare function userInputTitle(content: string | ContentBlock[]): string;
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