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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.import {  notImplemented,  intoCallbackAPIWithIntercept,  MaybeEmpty} from "./_utils.ts";
import { appendFile, appendFileSync } from "./_fs/_fs_appendFile.ts";export { appendFile, appendFileSync };
const {  readFile: denoReadFile,  readFileSync: denoReadFileSync,  readlink: denoReadlink,  readlinkSync: denoReadlinkSync} = Deno;
type ReadFileCallback = (  err: MaybeEmpty<Error>,  data: MaybeEmpty<string | Uint8Array>) => void;
interface ReadFileOptions {  encoding?: string | null;  flag?: string;}
type ReadlinkCallback = (  err: MaybeEmpty<Error>,  linkString: MaybeEmpty<string | Uint8Array>) => void;
interface ReadlinkOptions {  encoding?: string | null;}
function getEncoding(  optOrCallback?: ReadFileOptions | ReadFileCallback): string | null {  if (!optOrCallback || typeof optOrCallback === "function") {    return null;  } else {    if (optOrCallback.encoding) {      if (        optOrCallback.encoding === "utf8" ||        optOrCallback.encoding === "utf-8"      ) {        return "utf8";      } else if (optOrCallback.encoding === "buffer") {        return "buffer";      } else {        notImplemented();      }    }    return null;  }}
function maybeDecode(  data: Uint8Array,  encoding: string | null): string | Uint8Array {  if (encoding === "utf8") {    return new TextDecoder().decode(data);  }  return data;}
function maybeEncode(  data: string,  encoding: string | null): string | Uint8Array {  if (encoding === "buffer") {    return new TextEncoder().encode(data);  }  return data;}
export function readFile(  path: string,  optOrCallback: ReadFileCallback | ReadFileOptions,  callback?: ReadFileCallback): void {  let cb: ReadFileCallback | undefined;  if (typeof optOrCallback === "function") {    cb = optOrCallback;  } else {    cb = callback;  }
  const encoding = getEncoding(optOrCallback);
  intoCallbackAPIWithIntercept<Uint8Array, string | Uint8Array>(    denoReadFile,    (data: Uint8Array): string | Uint8Array => maybeDecode(data, encoding),    cb,    path  );}
export function readFileSync(  path: string,  opt?: ReadFileOptions): string | Uint8Array {  return maybeDecode(denoReadFileSync(path), getEncoding(opt));}
export function readlink(  path: string,  optOrCallback: ReadlinkCallback | ReadlinkOptions,  callback?: ReadlinkCallback): void {  let cb: ReadlinkCallback | undefined;  if (typeof optOrCallback === "function") {    cb = optOrCallback;  } else {    cb = callback;  }
  const encoding = getEncoding(optOrCallback);
  intoCallbackAPIWithIntercept<string, Uint8Array | string>(    denoReadlink,    (data: string): string | Uint8Array => maybeEncode(data, encoding),    cb,    path  );}
export function readlinkSync(  path: string,  opt?: ReadlinkOptions): string | Uint8Array {  return maybeEncode(denoReadlinkSync(path), getEncoding(opt));}
/** Revist once https://github.com/denoland/deno/issues/4017 lands */export function access(  path: string, // eslint-disable-line @typescript-eslint/no-unused-vars  modeOrCallback: number | Function, // eslint-disable-line @typescript-eslint/no-unused-vars  callback?: Function // eslint-disable-line @typescript-eslint/no-unused-vars): void {  notImplemented("Not yet available");}
/** Revist once https://github.com/denoland/deno/issues/4017 lands */// eslint-disable-next-line @typescript-eslint/no-unused-varsexport function accessSync(path: string, mode?: number): undefined {  notImplemented("Not yet available");}