add a file logger in sails.js

log.js

const winston = require('winston')
const customLogger = new (winston.Logger)({
  transports: [
    new (winston.transports.Console)({
      colorize: true,
      level: 'silly',
      json: false
    }),
    new (winston.transports.File)({ // add as many as you want
      name: 'verbose-file',
      filename: 'logs/verbose.log',
      colorize: false,
      level: 'verbose', // level of the log
      json: false
    }),
    new (winston.transports.File)({
      name: 'errors-file',
      filename: 'logs/error.log',
      colorize: false,
      level: 'error',
      json: false
    })
  ]
})

module.exports.log = {
  custom: customLogger

}