/**
 * Event text for a retriever preview.
 *
 * The preview used to cut every event at 240 characters with no marker, so an
 * agent quoting a fetched line could not tell it was quoting a fragment: on
 * the homepage demo the recommendation lines came out as "... - Transient
 * error StatusCode.UNAVA" and "... - Receive ListRecommend". A preview holds
 * at most ten events, so it can carry them whole. Only an event over
 * PREVIEW_TEXT_MAX_CHARS (a multi-kilobyte blob, not a log line) is shortened,
 * and then the entry says so in `text_truncated` and `text_chars`, so nobody
 * mistakes the fragment for the line.
 */
export declare const PREVIEW_TEXT_MAX_CHARS = 8000;
export interface PreviewText {
    text?: string;
    /** Present and true only when `text` is a prefix of a longer event. */
    text_truncated?: true;
    /** The full event length, present only alongside `text_truncated`. */
    text_chars?: number;
}
export declare function previewText(raw: unknown): PreviewText;