节点Winston记录器：着色不起作用

Question

我创建了一个使用Winston的记录器模块。我正在尝试格式化日志，以便对它们进行颜色编码。但是，它通过以下输出弄乱了我的日志。

{"message":"Server Running On: localhost:3000","level":"\u001b[32minfo\u001b[39m","timestamp":"2018-06-30 19:20:09"}
{"message":"MongoDB Successfully Connected On: mongodb://localhost:27017/project","level":"\u001b[32minfo\u001b[39m","timestamp":"2018-06-30 19:20:09"}

可以看到\ u ....字符串。日志也不进行颜色编码。我的配置怎么了？我正在使用Winston 3，请参见下面的代码。

import { createLogger, transports, format } from "winston";
import * as appRoot from "app-root-path";

class Logger {

    public logger: any;

    constructor() {

        const options = {
            file: {
                level: "info",
                filename: `${appRoot}/logs/app.log`,
                handleExceptions: true,
                json: true,
                maxsize: 5242880, // 5MB
                maxFiles: 5,
                colorize: true,
            },
            console: {
                level: "debug",
                handleExceptions: true,
                json: false,
                colorize: true,
            },
            exceptionHandlers: {
                filename: `${appRoot}/logs/exceptions.log`,
            },
        };

        this.logger = createLogger({

            format: format.combine(
                format.simple(),
                format.timestamp({
                    format: "YYYY-MM-DD HH:mm:ss",
                }),
                format.colorize(),
                format.json(),
            ),

            transports: [
                new transports.File(options.file),
                new transports.Console(options.console),
            ],
            exceptionHandlers: [
                new transports.File(options.exceptionHandlers),
            ],
            // do not exit on handled exceptions
            exitOnError: false,
        });

    }

}

export default new Logger().logger;