concatStringsAndStreams.js

const CombinedStream = require('combined-stream2');

function concatStringsAndStreams(strings, ...args) {
  let combinedStream = CombinedStream.create()
  combinedStream.append(Buffer.from(strings[0], 'utf8'))
  for (let i = 0; i < args.length; i++) {
    let arg = args[i]
    let string = strings[i+1]
    if (arg && arg.pipe) {
      combinedStream.append(arg)
    }
    else {
      combinedStream.append(Buffer.from(String(arg), 'utf8'))
    }
    combinedStream.append(Buffer.from(String(string), 'utf8'))
  }
  return combinedStream
}

module.exports = concatStringsAndStreams