how to use the writev function from fs-extra in javascript

The writev function from the fs-extra module is used to write multiple buffers to a file at once. It is an efficient way to write data to a file, especially when you have many small buffers.

Here's an example that demonstrates how to use the writev function:

index.tsx
const fs = require('fs-extra');

const file = 'output.txt';
const buffers = [
  Buffer.from('Hello, '),
  Buffer.from('world!'),
];

fs.writev(file, buffers, (err) => {
  if (err) {
    console.error(err);
    return;
  }

  console.log('Data written to file.');
});
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In this example, we first import the fs-extra module using the require function. Then, we specify the name of the file (in this case, output.txt) and create an array of the buffers we want to write using the Buffer.from function.

Next, we call the writev function with the file name, the array of buffers, and a callback function that will be called when the operation is complete. If an error occurs, the error will be passed to the callback function as the first argument.

If the data is successfully written to the file, the callback function will be called without any arguments. In that case, we output a success message to the console using the console.log function.