如何导入 NodeJS winston-daily-rotate-file 依赖项？

Question

我可以winston-daily-rotate-file通过使用来使用依赖项require。

var DailyRotateFile = require('winston-daily-rotate-file');

但是当我尝试像下面这样导入时，它不起作用。如何解决呢？

import * as DailyRotateFile from 'winston-daily-rotate-file';

自定义logger.js

import { createLogger, format, transports } from 'winston';
import * as DailyRotateFile from 'winston-daily-rotate-file';
import fs from 'fs';
import path from 'path';

const env = process.env.NODE_ENV || 'development';
const logDir = 'log';
if(!fs.existsSync(logDir)) {
    fs.mkdirSync(logDir);
}

const dailyRotateFileTransport = new DailyRotateFile({
    filename: `${logDir}/%DATE%-results.log`,
    datePattern: 'YYYY-MM-DD',
    maxSize: '1k'
})

const logger = createLogger({
    level: env === 'development' ? 'debug' : 'info',
    format: format.combine(
        format.label({ label: path.basename(process.mainModule.filename)}),
        //format.colorize(),
        format.timestamp({
            format: 'YYYY-MM-DD HH:mm:ss'
        }),
        format.json()
    ),
    transports: [
        new transports.Console({
            level: 'info',
            format: format.combine(
                format.printf(
                    info => `${info.timestamp} ${info.level} [${info.label}]: ${info.message}`
                )
            )
        }),
        dailyRotateFileTransport
    ]
});

module.exports = logger;

运行应用程序时，出现以下错误

var dailyRotateFileTransport = new DailyRotateFile({
                               ^

TypeError: DailyRotateFile is not a constructor

---

Answer 1

import * as winston from 'winston';
import 'winston-daily-rotate-file';
import appRoot from 'app-root-path';


const logger = winston.createLogger({
    transports: [
        new winston.transports.DailyRotateFile ({
            filename: 'application-%DATE%.log',
            dirname: `${appRoot}/logs/`,
            level: 'info',
            handleExceptions: true,
            colorize: true,
            json: false,
            zippedArchive: true,
            maxSize: '20m',
            maxFiles: '14d'        
        })
    ],
    exitOnError: false
});

logger.stream = {
    write: function(message, encoding) {
      logger.info(message);
    },
  };

export default logger;

这会将记录器配置为每日轮换。

Answer 2

尝试这个

import DailyRotateFile = require("winston-daily-rotate-file");