gulp-concat.js

gulp-concat.js

var through = require('through2')
var File = require('vinyl')

var concat = function(filename, opts) {
  var dest = new File({path: filename, contents: through()})

  var stream = through.obj(function(file, _, done) {
    file.contents
      .pipe(dest.contents, {end: false})
      .on('end', function() {
        done()
      })
  }, function(done) {
    dest.contents.end()
    done()
  });

  stream.push(dest)

  return stream
};