return gulp.src(paths.scripts)
           .pipe(sourcemaps.init())
           .pipe(to5())
           .pipe(concat('index.js'))
           .pipe(sourcemaps.write('.'))
           .pipe(gulp.dest(paths.dist))
           .on('error', function(e) { console.log(e); });

return pipe([
        gulp.src(paths.scripts)
        ,sourcemaps.init()
        ,to5()
        ,concat('index.js')
        ,sourcemaps.write('.')
        ,gulp.dest(paths.dist)
       ])
       .on('error', function(e) { console.log(e); });

return pipe(gulp.src(paths.scripts),
            [
              sourcemaps.init(),
              to5(),
              concat('index.js'),
              sourcemaps.write('.'),
              gulp.dest(paths.dist)
            ])
            .on('error', function(e) {console.log(e);});

module.exports = function pipe(stream, tubes) {
  tubes = tubes || stream.slice(1);
  return tubes.reduce(function(stream, tube) { return stream.pipe(tube); }, Array.isArray(stream) ? stream[0] : stream);
};