append to a csv file in typescript

To append data to a CSV file in TypeScript, you can use the fs module that comes with Node.js. Here's an example of how to do it:

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

const csvFilePath = 'path/to/file.csv';
const data = 'new,data,to,append\n';

fs.appendFile(csvFilePath, data, (err) => {
  if (err) throw err;
  console.log('Data appended to file successfully');
});
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Here, we first define the path to the CSV file and the data that we want to append to it. We then use the fs.appendFile() method to append the data to the file. If there is an error, we throw an exception. Otherwise, we show a success message in the console.

Make sure that you have the proper permissions to write to the file before running this code.