Function parseNDJSON

test/helpers/session-runner.ts:78–112

(lines: string[])

 * reader and unit tests.
 */
export function parseNDJSON(lines: string[]): ParsedNDJSON {
  const transcript: any[] = [];
  let resultLine: any = null;
  let turnCount = 0;
  let toolCallCount = 0;
  const toolCalls: ParsedNDJSON['toolCalls'] = [];

  for (const line of lines) {
    if (!line.trim()) continue;
    try {
      const event = JSON.parse(line);
      transcript.push(event);

      // Track turns and tool calls from assistant events
      if (event.type === 'assistant') {
        turnCount++;
        const content = event.message?.content || [];
        for (const item of content) {
          if (item.type === 'tool_use') {
            toolCallCount++;
            toolCalls.push({
              tool: item.name || 'unknown',
              input: item.input || {},
              output: '',
            });
          }
        }
      }

      if (event.type === 'result') resultLine = event;
    } catch { /* skip malformed lines */ }
  }

  return { transcript, resultLine, turnCount, toolCallCount, toolCalls };
}

function truncate(s: string, max: number): string {
  return s.length > max ? s.slice(0, max) + '…' : s;