For repiping streams. Useful for laying pipelines.
npm install through2-repipe
var repipe = require('through2-repipe');
var pipeline = cipher.pipe(decipher).pipe(process.stdout);
var line = pipeline.pipe(repipe(cipher, process.stdout));
fs.createReadStream('README.md').pipe(line);
becomes
fs.createReadStream('README.md').pipe(cipher).pipe(decipher).pipe(process.stdout);