如何使用打字稿在winston中设置自定义日志级别？

Question

我在enum 中声明了LogLevel，winston 抛出了一个错误。那么levels 的类型应该是什么？

logger.ts

enum LogLevel {
  trace,
  debug,
  info,
  warn,
  error
}

const logConfig = {
  format: _format.json(),
  levels: LogLevel,
  transports: [
    new _transports.Console() 
  ]

const logger =  createLogger(logConfig);

错误

Argument of type '{ format: Format; levels: typeof LogLevel; level: string; transports: _transports.ConsoleTransportInstance[]; }' is not assignable to parameter of type 'LoggerOptions'.
  Types of property 'levels' are incompatible.
    Type 'typeof LogLevel' is not assignable to type 'AbstractConfigSetLevels'.
      Index signatures are incompatible.
        Type 'string' is not assignable to type 'number'.ts(2345)

Answer 1

解决方案

不是将枚举直接传递给级别，而是在键值对中定义一个常量，如_logLevel 所示。

enum LogLevel {
  trace,
  debug,
  info,
  warn,
  error
}

const _logLevel = {
  error: LogLevel.Error,
  warn: LogLevel.Warn,
  info: LogLevel.Info,
  debug: LogLevel.Debug,
  trace: LogLevel.Trace
};

const logConfig = {
  format: _format.json(),
  levels: _logLevel,
  transports: [
    new _transports.Console() 
  ]

const logger =  createLogger(logConfig);