PostCss плагин postcss-easy-import не импортирует стили. Почему?

Question

[Николай]

Не импортируются стили

var 	        gulp          = require('gulp'),
		gutil         = require('gulp-util' ),
		pug        	  = require('gulp-pug'),
		postcss 	  = require('gulp-postcss'),
		assets  	  = require('postcss-assets'),
		cssnext		  = require('postcss-cssnext'),
	    sourcemaps 	  = require('gulp-sourcemaps'),
	    reporter 	  = require('postcss-browser-reporter'),
	    importcss 	  = require('postcss-easy-import'),
	    rucksack 	  = require('rucksack-css'),
	    lost 		  = require('lost'),
	    stylelint	  = require('stylelint'),
	    config		  = require('./stylelint.config.js'),
	    plumber 	  = require('gulp-plumber'),
	    browsersync   = require('browser-sync'),
		concat        = require('gulp-concat'),
		uglify        = require('gulp-uglify'),
		rename        = require('gulp-rename'),
		notify        = require("gulp-notify"),
		rsync         = require('gulp-rsync');

gulp.task('browser-sync', function() {
	browsersync({
		server: {
			baseDir: 'app'
		},
		notify: false,
		// open: false,
		// tunnel: true,
		// tunnel: "projectmane", //Demonstration page: http://projectmane.localtunnel.me
	})
});

var paths = {
			pugSourse: 'dev/',
			pugDestination: 'app/',
			cssSource: 'dev/',
  			cssDestination: 'app/css/'
		};

gulp.task('pug', function buildHTML() {
	return gulp.src(paths.pugSourse + '*.pug')
	.pipe(plumber({
		errorHandler: notify.onError(function(err){
			return {
				title: 'Pug',
				message: err.message
			}
		})
	}))
	.pipe(pug({
		pretty: true
	}))
	.pipe(gulp.dest(paths.pugDestination))
	.pipe(browsersync.reload( {stream: true} ))
});

gulp.task('css', function() {
  return gulp.src(paths.cssSource + '*.css')
    .pipe(sourcemaps.init())
    .pipe(postcss([
      importcss(),
      cssnext(),
      rucksack(),
      assets({ loadPaths: ['app/img/bg/']}),
      lost(),
      stylelint(config),
      reporter()
    ]))
    .pipe(sourcemaps.write('./'))
    .pipe(gulp.dest(paths.cssDestination));
});

gulp.task('js', function() {
	return gulp.src([
		'app/libs/jquery/dist/jquery.min.js',
		'app/js/common.js', // Always at the end
		])
	.pipe(concat('scripts.min.js'))
	// .pipe(uglify()) // Mifify js (opt.)
	.pipe(gulp.dest('app/js'))
	.pipe(browsersync.reload({ stream: true }))
});

gulp.task('rsync', function() {
	return gulp.src('app/**')
	.pipe(rsync({
		root: 'app/',
		hostname: '[e-mail]',
		destination: 'yousite/public_html/',
		// include: ['*.htaccess'], // Includes files to deploy
		exclude: ['**/Thumbs.db', '**/*.DS_Store'], // Excludes files from deploy
		recursive: true,
		archive: true,
		silent: false,
		compress: true
	}))
});

gulp.task('watch', ['pug', 'css', 'js', 'browser-sync'], function() {
	gulp.watch(paths.pugSourse + '**/*.pug', ['pug']);
	gulp.watch(paths.pugSourse + '**/*.css', ['css']);
	gulp.watch('app/*.html', browsersync.reload)
});

gulp.task('default', ['watch']);