Winston/Node.js how add a Transport only for certain environment?

Question

I have the follow configuration:

var winston = require(\'winston\');
var Mail = require(\'winston-mail\').Mail;

var logger = new (winston.Logger)({
  transports         


        

Answer 1

The transports configuration is just a plain old Array. So we can use all the usual tricks on it. In this case, you want a conditional push().

const winston = require('winston');
const transports = [
    new winston.transports.Console({
        level    : 'info',
        colorize : true
    }),
    new winston.transports.File({
        level    : 'info',
        filename : './logs/logs.log'
    })
];

if (process.env.NODE_ENV === 'production') {
    const Mail = require('winston-mail').Mail;

    transports.push(new Mail({
        to       : 'xxxxxx@xxxxxx.xx',
        from     : 'winston@xxxxx.xx',
        subject  : 'Errors occurred',
        level    : 'error',
        host     : 'smtp.xxxxx.xx',
        username : 'xxxx@xxxx.xx', 
        password : 'xxxxx',
        port     : 1234
    }));
}

const logger = new winston.Logger({
    transports
});

This code should be usable as is on Node.js >= 4, after filling in the mail configuration placeholders.

The same principle can be applied to the exceptionHandlers.