class FileHandler extends WriterHandlerimport { FileHandler } from "https://dotland.deno.dev/std@0.146.0/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(): voidhandle(logRecord: LogRecord): voidlog(msg: string): voidsetup()