Node.js fs.Dir.closeSync() Method

The fs.Dir.closeSync() method is an inbuilt application programming interface of class fs.Dir within File System module which is used to close the directory’s underlying resource handle synchronously.

Syntax:

const dir.closeSync()

Parameter: This method does not accept any parameter.
Return Value: This method returns an undefined object

Below programs illustrates the use of fs.Dir.closeSync() method.

Example 1: 

Filename: index.js

Javascript

// Node.js program to demonstrate the
// dir.closeSync() method
const fs = require('fs');

// Initiating async function
async function stop(path) {

  // Creating and initiating directory's
  // underlying resource handle
  const dir = await fs.promises.opendir(path);

  console.log("All the direct before operation :- ");
  for (var i = 0; i <= 6; i++) {
     console.log(((dir.readSync())).name);
  }

  // Synchronously closeSyncing the directory's
  // underlying resource handle
  const promise = dir.closeSync();

  // Display the result
  console.log("dir is closed successfully");
}

// Catching error
stop('./').catch(console.error);

Run index.js file using the following command: 

node index.js

Output:

All the direct before operation :-
abcd.cer
books.txt
cert.cer
certfile.cer
certificate1.cer
example.txt
features
dir is closed successfully

Example 2:

Filename: index.js

Javascript

// Node.js program to demonstrate the
// dir.closeSync() method
const fs = require('fs');
const fsPromises = fs.promises;

// Name of the directory to be created
let directo = './temp';

// Checking if the directory is present or not
if (!fs.existsSync(directo)){
  fs.mkdirSync(directo);
}

// Initiating asynchronous function
async function funct(path) {

  // Initializing dir
  let dir = null;
  let pathval = null;

  try {

   // Creating and initiating directory's
   // underlying resource handle
   dir = await fs.promises.opendir(
      new URL('file:///F:/java/temp'));

   console.log("All the direct before operation :- "
                 + ((dir.readSync())));

   // Getting the path of the directory
   // by using path() method
   pathval = dir.path;

  } finally {

    if (dir) {

      // Close the file if it is opened.
      console.log("Path :- " + pathval);

      console.log("All the direct before operation :- "
                          + ((dir.readSync())));

      console.log("dir is closed successfully");

      await dir.closeSync();
    }
  }
}

funct('./').catch(console.error);

Run index.js file using the following command: 

node index.js

Output: 

All the direct before operation:- [object Object]
Path :- F:
All the direct before operation:- [object Object]
dir is closed successfully

Reference: https://nodejs.org/dist/latest-v12.x/docs/api/fs.html#fs_dir_closesync