Compiliar Sass

gistfile.js

// CSS settings
var css = {
  src         : dir.src + 'scss/style.scss',
  watch       : dir.src + 'scss/**/*',
  build       : dir.build,
  sassOpts: {
    outputStyle     : 'nested',
    imagePath       : images.build,
    precision       : 3,
    errLogToConsole : true
  },
  processors: [
    require('postcss-assets')({
      loadPaths: ['images/'],
      basePath: dir.build,
      baseUrl: '/wp-content/themes/wptheme/'
    }),
    require('autoprefixer')({
      browsers: ['last 2 versions', '> 2%']
    }),
    require('css-mqpacker'),
    require('cssnano')
  ]
};

// CSS processing
gulp.task('css', ['images'], () => {
  return gulp.src(css.src)
    .pipe(sass(css.sassOpts))
    .pipe(postcss(css.processors))
    .pipe(gulp.dest(css.build))
    .pipe(browsersync ? browsersync.reload({ stream: true }) : gutil.noop());
});