[destus]

https://www.npmjs.com/package/gulp-sass#source-maps

gulp.task('style:dist', function () {
    return gulp.src(path.app.style)
        .pipe(sourcemaps.init()).pipe(sass().on('error', sass.logError)).pipe(sourcemaps.write()).pipe(cleanCSS()).pipe(autoprefixer({browsers: ['last 15 versions'], cascade: false, grid: true})).pipe(gulp.dest(path.dist.css)).pipe(reload({stream: true}));
});