Function writeErrorLog

src/bin/codegraph.ts:404–445

* Write detailed error log to .codegraph/errors.log

(projectPath: string, errors: Array<{ message: string; filePath?: string; severity: string; code?: string }>)

 * Write detailed error log to .codegraph/errors.log
 */
function writeErrorLog(projectPath: string, errors: Array<{ message: string; filePath?: string; severity: string; code?: string }>): void {
  const cgDir = getCodeGraphDir(projectPath);
  if (!fs.existsSync(cgDir)) return;

  const logPath = path.join(cgDir, 'errors.log');

  // Group errors by file path
  const errorsByFile = new Map<string, Array<{ message: string; code?: string }>>();
  const noFileErrors: Array<{ message: string; code?: string }> = [];

  for (const err of errors) {
    if (err.severity !== 'error') continue;
    if (err.filePath) {
      let list = errorsByFile.get(err.filePath);
      if (!list) {
        list = [];
        errorsByFile.set(err.filePath, list);
      }
      list.push({ message: err.message, code: err.code });
    } else {
      noFileErrors.push({ message: err.message, code: err.code });
    }
  }

  const lines: string[] = [
    `CodeGraph Error Log - ${new Date().toISOString()}`,
    `${errorsByFile.size} files with errors`,
    '',
  ];

  for (const [filePath, fileErrors] of errorsByFile) {
    for (const err of fileErrors) {
      lines.push(`${filePath}: ${err.message}`);
    }
  }

  for (const err of noFileErrors) {
    lines.push(err.message);
  }

  fs.writeFileSync(logPath, lines.join('\n') + '\n');
}

/**
 * Telemetry for a completed full index (see TELEMETRY.md). The bounded flush