Adding files mid-stream in Gulp

gistfile1.js

var path = require('path');
var gulp = require('gulp');
var concat = require('gulp-concat');
var templateCache = require('gulp-angular-templatecache');
var addsrc = require('gulp-add-src');

var paths = {
  src: 'public/assets/src'
};

var sourceFiles = [
  path.join(paths.src, 'app.js'),
  path.join('!' + paths.src, 'templates.js'),
  path.join(paths.src, 'routes.js'),
  path.join(paths.src, '**/*module*.js'),
  path.join(paths.src, '**/*.js')
];

var templates = path.join(paths.src, '**/*.html');

gulp.task('fox', function () {
  return gulp.src(sourceFiles)
    .pipe(
      addsrc(templates)
        .pipe(templateCache('templates.js', {
          root: '/assets/src',
          module: 'app.templates'
        }))
    )
    .pipe(concat('bundle.js'))
    .pipe(gulp.dest('dist'));
});