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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.import { asyncIterableToCallback } from "./_fs_watch.ts";import Dirent from "./_fs_dirent.ts";import { denoErrorToNodeError } from "../internal/errors.ts";import { getValidatedPath } from "../internal/fs/utils.mjs";import { Buffer } from "../buffer.ts";import { promisify } from "../internal/util.mjs";
function toDirent(val: Deno.DirEntry): Dirent {  return new Dirent(val);}
type readDirOptions = {  encoding?: string;  withFileTypes?: boolean;};
type readDirCallback = (err: Error | null, files: string[]) => void;
type readDirCallbackDirent = (err: Error | null, files: Dirent[]) => void;
type readDirBoth = (  ...args: [Error] | [null, string[] | Dirent[] | Array<string | Dirent>]) => void;
export function readdir(  path: string | Buffer | URL,  options: { withFileTypes?: false; encoding?: string },  callback: readDirCallback,): void;export function readdir(  path: string | Buffer | URL,  options: { withFileTypes: true; encoding?: string },  callback: readDirCallbackDirent,): void;export function readdir(path: string | URL, callback: readDirCallback): void;export function readdir(  path: string | Buffer | URL,  optionsOrCallback: readDirOptions | readDirCallback | readDirCallbackDirent,  maybeCallback?: readDirCallback | readDirCallbackDirent,) {  const callback =    (typeof optionsOrCallback === "function"      ? optionsOrCallback      : maybeCallback) as readDirBoth | undefined;  const options = typeof optionsOrCallback === "object"    ? optionsOrCallback    : null;  const result: Array<string | Dirent> = [];  path = getValidatedPath(path);
  if (!callback) throw new Error("No callback function supplied");
  if (options?.encoding) {    try {      new TextDecoder(options.encoding);    } catch {      throw new Error(        `TypeError [ERR_INVALID_OPT_VALUE_ENCODING]: The value "${options.encoding}" is invalid for option "encoding"`,      );    }  }
  try {    asyncIterableToCallback(Deno.readDir(path.toString()), (val, done) => {      if (typeof path !== "string") return;      if (done) {        callback(null, result);        return;      }      if (options?.withFileTypes) {        result.push(toDirent(val));      } else result.push(decode(val.name));    }, (e) => {      callback(denoErrorToNodeError(e as Error, { syscall: "readdir" }));    });  } catch (e) {    callback(denoErrorToNodeError(e as Error, { syscall: "readdir" }));  }}
function decode(str: string, encoding?: string): string {  if (!encoding) return str;  else {    const decoder = new TextDecoder(encoding);    const encoder = new TextEncoder();    return decoder.decode(encoder.encode(str));  }}
export const readdirPromise = promisify(readdir) as (  & ((path: string | Buffer | URL, options: {    withFileTypes: true;    encoding?: string;  }) => Promise<Dirent[]>)  & ((path: string | Buffer | URL, options?: {    withFileTypes?: false;    encoding?: string;  }) => Promise<string[]>));
export function readdirSync(  path: string | Buffer | URL,  options: { withFileTypes: true; encoding?: string },): Dirent[];export function readdirSync(  path: string | Buffer | URL,  options?: { withFileTypes?: false; encoding?: string },): string[];export function readdirSync(  path: string | Buffer | URL,  options?: readDirOptions,): Array<string | Dirent> {  const result = [];  path = getValidatedPath(path);
  if (options?.encoding) {    try {      new TextDecoder(options.encoding);    } catch {      throw new Error(        `TypeError [ERR_INVALID_OPT_VALUE_ENCODING]: The value "${options.encoding}" is invalid for option "encoding"`,      );    }  }
  try {    for (const file of Deno.readDirSync(path.toString())) {      if (options?.withFileTypes) {        result.push(toDirent(file));      } else result.push(decode(file.name));    }  } catch (e) {    throw denoErrorToNodeError(e as Error, { syscall: "readdir" });  }  return result;}