how to use the readv function from the fs-extra library in typescript

To use the readv function from the fs-extra library in TypeScript, you need to import the fs-extra module and use the readv function as follows:

index.ts
import * as fs from 'fs-extra';

const fileDescriptor = await fs.open('/path/to/file', 'r');
const bufferList = [
    Buffer.alloc(10),
    Buffer.alloc(20),
    Buffer.alloc(30)
];
const bytesRead = await fs.readv(fileDescriptor, bufferList);
await fs.close(fileDescriptor);

console.log(`Read ${bytesRead} bytes from file`);
console.log(bufferList.map(buffer => buffer.toString()));
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In this TypeScript code, we first import the fs-extra module and open a file in read mode using the open function. We then create an array of Buffer objects, each with a different size, that will store the read data.

We pass both the file descriptor and the array of buffer objects to the readv function to read data from the file into the buffers. The function returns the total number of bytes read.

Finally, we close the file descriptor using the close function and log the number of bytes read from the file and the content of each buffer converted to a string.

Note that the fs-extra library provides many other file system related functions that you can use in TypeScript to manipulate files and directories.