winston 加時間戳記

這邊是我把 winston npm 官方文件抓下來改版的，改版後有時間戳記。

const winston = require("winston");

const logger = winston.createLogger({

  level: 'info',

  format: winston.format.combine(

    winston.format.timestamp(),

    winston.format.json()

  ),

  defaultMeta: { service: 'user-service' },

  transports: [

    //

    // - Write all logs with importance level of `error` or less to `error.log`

    // - Write all logs with importance level of `info` or less to `combined.log`

    //

    new winston.transports.File({ filename: 'error.log', level: 'error', }),

    new winston.transports.File({ filename: 'combined.log' }),

  ],

});

//

// If we're not in production then log to the `console` with the format:

// `${info.level}: ${info.message} JSON.stringify({ ...rest }) `

//

if (process.env.NODE_ENV !== 'production') {

  logger.add(new winston.transports.Console({

    format: winston.format.simple(),

  }));

}

module.exports = logger;