Gulp can't see scss - sass

Question

It's propably some stupid error, but I can't see it!
My gulp can't compile my scss. It seems like I gave him wrong directories, but that was the first thing to check.
There are no errors. Everything seems ok, but it just does not work.
There is this important part of my Gulpfile:
gulp.task('styles-dev', function() {
return gulp.src('src/scss/*.scss')
.pipe(plumber())
.pipe(sass({ style: 'expanded' }))
.pipe(autoprefixer('last 2 version', 'safari 5', 'ie 8', 'ie 9', 'opera 12.1'))
.pipe(gulp.dest('dist/css/'));
});
Folder structure:
root < here is gulpfile
dist
css
inc
node_modules
src
js
scss

Answer 1

I would start from something which works... For example:
'use strict';
var gulp = require('gulp');
var sass = require('gulp-sass');
gulp.task('styles-dev', function () {
return gulp.src('src/scss/**/*.scss')
.pipe(sass().on('error', sass.logError))
.pipe(gulp.dest('dist/css/'));
});
This code adds an error logging, too, so it should be easier to track possible errors...
Then, once you see it working, you can start adding other options and components (style, plumber, autoprefixer, ...).

Answer 2

To start with, you have a couple syntax errors:
Assuming your sass requires gulp-sass, you have an typo: say outputStyle instead of style
Assuming your autoprefixer requires gulp-autoprefixer, your syntax is wrong (see https://github.com/postcss/autoprefixer#usage). It should have { browsers: [] }, "last 2 versions", and capitalization. I think this will work:
.pipe(autoprefixer({ browsers: ['last 2 versions', 'Safari 5', 'IE 8', 'IE 9', 'Opera 12.1'] }))
(To be clear, that will support the two most recent versions of all the major browsers PLUS Safari 5, IE 8 & 9, and Opera 12.1. If that isn't what you wanted to support, check out https://github.com/ai/browserslist#queries)
Once you've made those fixes, add error logging to your plumber: Replace .pipe(plumber()) with
.pipe(plumber({
errorHandler: function (error) {
console.log(error.message);
this.emit('end');
}}))
If you still have trouble, let us know what errors are logged in the console and we can help you debug!