How to make a proxy for a file stream?

Question

JavaScript

There is such a library https://github.com/request/request you need to send a form from files but before that encrypt it.

const = {
   url: 'http://service.com/upload',
   //...
};
const stream = fs.createReadStream('file.text');
// Так работает
const r = request.post(options).form().append('file', stream);
// так нет
const encrypt = crypto.createCipher(algorithm, password);
const r = request.post(options).form().append('file', stream.pipe(encrypt));

How to change the transferred data without pipe?