Function useFileLogger

src/logger.ts:185–198

(logFile?: string)

 * Sets up logging to the firebase-debug.log file.
 */
export function useFileLogger(logFile?: string): string {
  const logFileName = logFile ?? findAvailableLogFile();
  logger.add(
    new winston.transports.File({
      level: "debug",
      filename: logFileName,
      format: winston.format.printf((info) => {
        const segments = [info.message, ...(info[SPLAT] || [])].map(tryStringify);
        return `[${info.level}] ${stripVTControlCharacters(segments.join(" "))}`;
      }),
    }),
  );
  return logFileName;
}

/**
 * Sets up logging to the command line.