LoicGoyet/gulpfile.js

## gulpfile.js
var gulp = require('gulp');
var inject = require('gulp-inject');

gulp.task('inject', function () {
  var target = gulp.src('index.html');
  // It's not necessary to read the files (will speed up things), we're only after their paths:
  var sources = gulp.src(['style.css', 'script.js'], {read: false});

  return target.pipe(inject(sources))
    .pipe(gulp.dest('result.html'));
});

## index.html
<!DOCTYPE html>
<html>
<head>
  <title>My index</title>
  <!-- inject:css -->
  <!-- endinject -->
</head>
<body>

  <!-- inject:js -->
  <!-- endinject -->
</body>
</html>

## result.html
<!DOCTYPE html>
<html>
<head>
  <title>My index</title>
  <!-- inject:css -->
  <link rel="stylesheet" href="/style.css">
  <!-- endinject -->
</head>
<body>

  <!-- inject:js -->
  <script src="/script.js"></script>
  <!-- endinject -->
</body>
</html>
	var gulp = require('gulp');
	var inject = require('gulp-inject');

	gulp.task('inject', function () {
	var target = gulp.src('index.html');
	// It's not necessary to read the files (will speed up things), we're only after their paths:
	var sources = gulp.src(['style.css', 'script.js'], {read: false});

	return target.pipe(inject(sources))
	.pipe(gulp.dest('result.html'));
	});
	<!DOCTYPE html>
	<html>
	<head>
	<title>My index</title>
	<!-- inject:css -->
	<!-- endinject -->
	</head>
	<body>

	<!-- inject:js -->
	<!-- endinject -->
	</body>
	</html>