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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.import {  intoCallbackAPIWithIntercept,  MaybeEmpty,  notImplemented,} from "../_utils.ts";import { fromFileUrl } from "../path.ts";import { promisify } from "../internal/util.mjs";
type ReadlinkCallback = (  err: MaybeEmpty<Error>,  linkString: MaybeEmpty<string | Uint8Array>,) => void;
interface ReadlinkOptions {  encoding?: string | null;}
function maybeEncode(  data: string,  encoding: string | null,): string | Uint8Array {  if (encoding === "buffer") {    return new TextEncoder().encode(data);  }  return data;}
function getEncoding(  optOrCallback?: ReadlinkOptions | ReadlinkCallback,): 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(`fs.readlink encoding=${optOrCallback.encoding}`);      }    }    return null;  }}
export function readlink(  path: string | URL,  optOrCallback: ReadlinkCallback | ReadlinkOptions,  callback?: ReadlinkCallback,) {  path = path instanceof URL ? fromFileUrl(path) : path;
  let cb: ReadlinkCallback | undefined;  if (typeof optOrCallback === "function") {    cb = optOrCallback;  } else {    cb = callback;  }
  const encoding = getEncoding(optOrCallback);
  intoCallbackAPIWithIntercept<string, Uint8Array | string>(    Deno.readLink,    (data: string): string | Uint8Array => maybeEncode(data, encoding),    cb,    path,  );}
export const readlinkPromise = promisify(readlink) as (  path: string | URL,  opt?: ReadlinkOptions,) => Promise<string | Uint8Array>;
export function readlinkSync(  path: string | URL,  opt?: ReadlinkOptions,): string | Uint8Array {  path = path instanceof URL ? fromFileUrl(path) : path;
  return maybeEncode(Deno.readLinkSync(path), getEncoding(opt));}