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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
export type CallbackWithError = (err?: Error) => void;
export interface FileOptions {  encoding?: string;  mode?: number;  flag?: string;}
export function isFileOptions(  fileOptions: string | FileOptions | undefined): fileOptions is FileOptions {  if (!fileOptions) return false;
  return (    (fileOptions as FileOptions).encoding != undefined ||    (fileOptions as FileOptions).flag != undefined ||    (fileOptions as FileOptions).mode != undefined  );}