how to use appendfilesync from fs-extra library in javascript

To use appendFileSync method from fs-extra library in Node.js, you need to follow these steps:

1. Install fs-extra library by running the following command in the terminal:

   index.tsx
   npm install fs-extra
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2. Import fs-extra library at the top of your JavaScript file:

   const fs = require('fs-extra');
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3. Use appendFileSync method to append data to a file:

   const filePath = 'path/to/file.txt';
   const data = 'Hello world!';
   
   try {
     fs.appendFileSync(filePath, data);
     console.log('Data has been appended to the file successfully.');
   } catch(err) {
     console.error(err);
   }
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   In the example above, we first specify the path of the file that we want to append data to. We then define the data that we want to append.

   Finally, we call the appendFileSync method and pass in the path of the file and the data that we want to append. If the operation is successful, we print a message to the console. Otherwise, we log the error to the console.

Note that appendFileSync is a synchronous method, which means that it will block the main thread until the operation is complete. Consider using the asynchronous method appendFile if you want to avoid blocking the main thread.