export interface JsonlCursor {
    newOffset: number;
    pendingTail: string;
}
/**
 * Return a baseline cursor for an append-only JSONL file without parsing the
 * historical content. This is used when attaching to an existing transcript:
 * old lines are history, so the caller only needs to start future reads after
 * the last complete newline.
 */
export declare function baselineJsonlCursor(path: string): JsonlCursor;
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