Method onClose

packages/core/src/tools/grep.ts:423–441

(code: number | null)

              reject(new Error(`Failed to start system grep: ${err.message}`));
            };
            const onClose = (code: number | null) => {
              const stdoutData = Buffer.concat(stdoutChunks).toString('utf8');
              const stderrData = Buffer.concat(stderrChunks)
                .toString('utf8')
                .trim();
              cleanup();
              if (code === 0) resolve(stdoutData);
              else if (code === 1)
                resolve(''); // No matches
              else {
                if (stderrData)
                  reject(
                    new Error(
                      `System grep exited with code ${code}: ${stderrData}`,
                    ),
                  );
                else resolve(''); // Exit code > 1 but no stderr, likely just suppressed errors
              }
            };

            const cleanup = () => {
              child.stdout.removeListener('data', onData);