我有一个使用winston和winston-daily-rotate-file的打字脚本项目。在项目开始时，我检查是否存在环境变量。如果没有，我想使用logger.error()记录丢失的变量。但由于某种原因，错误日志从未创建。日志确实出现在我的控制台中。

注：

日志记录器和检查环境变量的函数来自一个定制的npm模块，因为我想在我的所有其他项目中重用这个逻辑，所以日志记录器实际上放在node_modules/my-custom-project/util/logger. ts中

控制台输出：

yarn run v1.22.19
$ ts-node src/index.ts
Debugger attached.
info: Starting project Test {"timestamp":"2023-01-19T07:49:53.342Z","type":"start-project"}
error: Missing environment variable DEFAULT_REQUIRED_VARIABLE {"timestamp":"2023-01-19T07:49:53.348Z"}
error: Exiting because of missing environment variables {"data":["DEFAULT_REQUIRED_VARIABLE"],"timestamp":"2023-01-19T07:50:05.447Z"}

节点模块/我的自定义项目/实用程序/日志记录器. ts

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

const infoTransport: DailyRotateFile = new DailyRotateFile({
  level: "info",
  filename: "./logs/%DATE%/combined.log",
  datePattern: "YYYY-MM-DD-HH",
  maxSize: "20m",
  maxFiles: "14d",
  utc: true,
});
const warnTransport: DailyRotateFile = new DailyRotateFile({
  level: "warn",
  filename: "./logs/%DATE%/warn.log",
  datePattern: "YYYY-MM-DD-HH",
  maxSize: "20m",
  maxFiles: "14d",
  utc: true,
});
const errorTransport: DailyRotateFile = new DailyRotateFile({
  level: "error",
  filename: "./logs/%DATE%/error.log",
  datePattern: "YYYY-MM-DD-HH",
  maxSize: "20m",
  maxFiles: "14d",
  utc: true,
});

const logger = winston.createLogger({
  format: winston.format.combine(
    winston.format.timestamp(),
    winston.format.json()
  ),
  transports: [infoTransport, warnTransport, errorTransport],
});

if (process.env.NODE_ENV !== "test") {
  logger.add(
    new winston.transports.Console({
      format: winston.format.simple(),
    })
  );
}

export default logger;

node_modules/我的自定义项目/实用程序/要求环境变量. ts

export default (extraVariables: string[]): boolean => {
  let success = false;
  const missing: string[] = [],
    requiredVariables = [
      "DEFAULT_REQUIRED_VARIABLE",
      ...extraVariables,
    ];

  for (let variable of requiredVariables) {
    if (!(variable in process.env)) {
      missing.push(variable);
      logger.error(`Missing environment variable ${variable}`); // <-- no log file create, but log appears in my console?
    }
  }

  if (missing.length > 0) {
    handleError({
      error: {
        message: "Exiting because of missing environment variables",
        data: missing,
      },
      ...
    });
  } else {
    success = true;
  }
  return success;
};

索引. ts

const run = async () => {
  let log: Log = {
    message: `Starting project ${process.env.PROJECT_NAME}`,
    type: "start-project",
    data: new Date().toISOString,
  };
  logger.info(log);
  if (!requireEnvironmentVariables(['NON_DEFAULT_REQUIRED_VARIABLE']) process.exit();
  ...
};

run().catch((error) => handleError(error));

我尝试了以下操作：

• 正在将node_modules/my-custom-project/util/logger.ts和node_modules/my-custom-project/util/requireEnvironmentVariables.ts移动到我的本地项目。
• 在检查变量之前调用logger.info()。不创建日志文件。
• 如果所有环境变量都存在，并且在运行此函数后调用第一个logger.info()，则它似乎工作正常？

编辑：

我找到logger. on方法，它可以用来监听finish事件：

logger.on('finish', (info) => {
  // Still nog logs written here...
})

但是日志在那个时候并不存在，而且这里的info参数是未定义的，没有用。