Gulp sourcemaps and sass issues

Im trying to merge all my styles(css, scss) files into one file and compile. The reason is because there is files that based on variables in another file, but now i cant create a sourcemap.

What am I doing wrong? Is there a better solution?

const gulp = require('gulp');
const debug = require('gulp-debug');
const sass = require('gulp-sass');
const concat = require('gulp-concat');  
const uglify = require('gulp-uglify');  
const csso = require('gulp-csso');
const autoprefixer = require('gulp-autoprefixer');
const addsrc = require('gulp-add-src');
const sourcemaps = require('gulp-sourcemaps');
const ngmin = require('gulp-ngmin');
const browserSync = require('browser-sync');

gulp.task('default', ['browser-sync'], function(){
    gulp.watch('app/**/*.scss', ['styles']);
    gulp.watch('app/**/*.js', ['app-scripts']);
    gulp.watch('app/components/**/*.html', ['components-html']);
    gulp.watch('app/views/**/*.html', ['view-html']);
    gulp.watch('app/index.html', ['copy-index-html']);
    gulp.watch('app/json/**/*.json', ['copy-jsons']);
});

gulp.task('styles', () => 
    gulp.src([
        'app/style/vendors/*.css',
        'app/style/utils/*.scss',
        'app/style/base/*.scss',
        'app/style/layout/*.scss',
        'app/components/**/*.scss',
        'app/views/**/*.scss'
    ])
    .pipe(concat('styles.scss'))
    .pipe(sass())
    .pipe(autoprefixer())
    .pipe(csso())
    .pipe(concat('styles.min.css'))
    .pipe(gulp.dest('dist/style'))
);

gulp.task('copy-fonts', () =>
   gulp.src('app/assets/fonts/**/*.{ttf,woff,eof,svg}')
        .pipe(gulp.dest('dist/style/fonts'))
);

gulp.task('copy-images', () =>
   gulp.src('app/assets/img/**/*.{png,jpg,jpeg,svg}')
        .pipe(gulp.dest('dist/img'))
);

gulp.task('copy-index-html', () =>
    gulp.src('app/index.html')
        .pipe(gulp.dest('dist'))
);

gulp.task('components-html', () =>
    gulp.src(['app/components/**/*.html'])
        .pipe(gulp.dest('dist/components'))
);

gulp.task('view-html', () =>
    gulp.src('app/views/**/*.html')
        .pipe(gulp.dest('dist/views'))
);

gulp.task('copy-jsons', () =>
   gulp.src('app/json/**/*.json')
        .pipe(gulp.dest('dist/json'))
);

gulp.task('app-scripts', () =>
    gulp.src(['app/*.js', '!app/app.js'])
        .pipe(addsrc.append([
            'app/services/**/*.js',
            'app/views/**/*.js',
            'app/directives/**/*.js',
            'app/components/**/*.js'
        ]))
        .pipe(addsrc.prepend('app/app.js'))
        .pipe(ngmin())
        .pipe(concat('app.min.js'))
        .pipe(gulp.dest('dist/js'))
);

gulp.task('vendor-scripts', () =>
    gulp.src(['app/vendor/angular/*.js', '!app/vendor/angular/angular.js'])
        .pipe(addsrc.prepend('app/vendor/angular/angular.js'))
        .pipe(addsrc.append('app/vendor/*.js'))
        .pipe(uglify())
        .pipe(concat('vendor.min.js'))
        .pipe(gulp.dest('dist/js'))
);

gulp.task('browser-sync', () => 
    browserSync({
        files: 'dist/**/*.css, dist/**/*.js, app/**/*.html',
        port: 8082
    })
);

---

It is a common practice to create a main.scss file from which you import your other stylesheets as needded. Using this technique will help you to better organize your dependencies. For example if you have the following structure:

--app/style/
  --vendors/
    --vendors.scss
  --utils/
    --utils.css
  --base/
    --base.scss
    --variables.css //here are all my variables

Just create a main.scss file under app/styles that will import all your other files:

@import 'base/variables'; //note that the order is important for variables
@import 'vendors/vendors';
@import 'base/base';

now, did you notice we do not specify the file extension? this is important as you will want to change your .css files to .scss files, and more over you will want to prepend an underscore(_) to all files that are not the main.scss (read more about this here), this way you make sure the sass compiler doesn't create a bunch of css files and your only output will be the main.css file.

This way you will get the sourcemaps you need, do note that currently, you are not running your .css files through any sass task at the moment, so you will not get sourcemaps for these files.

It seems like a lot of work to do if your project is already big, but this will save you a lot of trouble as your app gets bigger.

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