onLog

• 类型：(level: LogLevel, log: RollupLog, defaultHandler: LogOrStringHandler) => void

  ¥Type: (level: LogLevel, log: RollupLog, defaultHandler: LogOrStringHandler) => void

• 可选：是 ✅

  ¥Optional: Yes ✅

自定义日志处理程序。在将每条日志消息写入控制台之前调用此方法。

¥Custom handler for logs. Called for each log message before it's written to the console.