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

To use the appendFile function from the fs-extra library in TypeScript, you first need to import both the fs-extra and fs libraries. Then, you can use appendFile function from fs-extra to append the content to the file asynchronously.

Here is an example of how to use the appendFile function:

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

const filePath = 'path/to/file.txt';
const contentToAppend = 'Hello, world!';

fsExtra.appendFile(fs, filePath, contentToAppend, (err) => {
  if (err) throw err;
  console.log('Content successfully appended to file!');
});
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In the above example, we first define the path to the file and the content we want to append to it. Then, we call the appendFile function from fs-extra, passing in the fs module, the path to the file, the content to append, and a callback function which will be called once the append operation completes.

Note: You can also use the Promise based syntax of appendFile from fs-extra library in TypeScript by using await and async keywords.