class FileHandler extends WriterHandlerimport { FileHandler } from "https://deno.land/std@0.156.0/log/handlers.ts"; ConstructorsnewFileHandler(levelName: LevelName, options: FileHandlerOptions)Propertiesprotected_buf: BufWriterSyncprotected_encoder: TextEncoderprotected_file: Deno.FsFile | undefinedprotected_filename: stringprotected_mode: LogModeprotected_openOptions: Deno.OpenOptionsMethodsdestroy()flush()handle(logRecord: LogRecord)log(msg: string)setup()