code: function transform (stream, target) {
    return stream
    .pipe($.plumber(::console.error))
    .pipe($.sourcemaps.init())
      .pipe($.babel({/** see .babelrc **/}))
    .pipe($.sourcemaps.write())
    .pipe($.plumber.stop())
    .pipe(gulp.dest(target))
  }
docs: Lazypipe alternative re-usable code
  @param  {[type]} stream [description]
  @param  {[type]} target [description]
  @return {[type]}        [description]