Node.js fs.filehandle.sync() Method

The fs.filehandle.sync() method is an inbuilt application programming interface of class fs.filehandle within File System module which is used to synchronize this file's in-core state with the storage device.
Syntax: 
 

const filehandle.sync()

Parameter: This method does not accept any argument as parameter.
Return Value: This method returns a pending promise which contains no value in it.
Below programs illustrates the use of fs.filehandle.sync() method.
Example 1: Filename: index.js 
 

Directory structure before running the program: 
 

👁 Image

Directory structure after running the program: 
 

👁 Image

Run index.js file using the following command: 
 

node index.js

Output: 
 

content of file before operation :- Content of file: example.txt
data is synchronized successfully
content of file after operation :- Content of file: example.txt

Example 2: Filename: index.js 
 

Directory structure before running the program: 
 

👁 Image

Directory structure after running the program: 
 

👁 Image

Run index.js file using the following command: 
 

node index.js

Output: 
 

content of file before operation :- This is a file containing a collection of books. 
data is synchronized successfully 
content of file after operation :- This is a file containing a collection of books. 
 

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