gulp concat javascript files in order same as in index.html

Question

I would like use gulp-useref for concant js files in same order as in index.html.

Solution has this structure:

• Solution Folder
  • App Folder
    • Services Folder
      • service.js
  • Scripts Folder
    • angular.js

index.html

<script src = "scripts/angular.js"></script>
<script src = "app/services/service.js"></script>

Gulp

gulp.src("index.html")
    .pipe(useref())
    .pipe(gulpif('*.js', uglify()))
    .pipe(concant("app.js"))
    .pipe(gulp.dest(config.dist + "/app"));

When I run this gulp task app.js file is created but contains content of index.html.

What I do wrong?