Gulp. Why doesn't it take css and js files when executing a task?

Question

Node.js

gulp.task('useref', function(){
return gulp.src('app/*.html')
.pipe(useref())
.pipe(gulpIf('*.js', uglify()))
.pipe (gulpIf('*.css', cssnano()))
.pipe(gulp.dest('dist'))
});
When executing, the task takes only html files ... how to make it take all the rest?

Answer 1

return gulp.src('app/*.html') you have a template and says to take only html files
and in general you have to return at the beginning