how to use appendfile from fs-extra library in typescript

import * as fsExtra from 'fs-extra';

const filePath: string = 'path/to/file.txt'; const dataToAppend: string = 'New data to append to file';

fsExtra.appendFile(filePath, dataToAppend, (error) => { if (error) { console.error(error); } else { console.log('Data has been appended to file'); } });

index.ts

In this example, we import the `fs-extra` library and use the `appendFile` method to append the `dataToAppend` string to the `filePath` file. 

Note that in TypeScript, it's best practice to explicitly define the variable types, like we did with `filePath` and `dataToAppend`. It's also important to handle any errors that may occur during the file write operation.

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