Gulp任务在控制台中抛出ENOTEMPTY错误

Question

我正在运行一些Gulp任务，并且在使用del npm模块执行干净任务后，我无法完全清理dist /文件夹，这是Gulp建议删除文件夹和文件的。我的Gulpfile.js如下：

// Setup modules/Gulp plugins
var gulp            = require('gulp'),
    del             = require('del'),
    less            = require('gulp-less'),
    minifyCSS       = require('gulp-minify-css'),
    fileinclude     = require('gulp-file-include'),
    streamify       = require('gulp-streamify'),
    order           = require('gulp-order'),
    concat          = require('gulp-concat'),
    uglify          = require('gulp-uglify'),
    sourcemaps      = require('gulp-sourcemaps'),
    imagemin        = require('gulp-imagemin'),
    pngquant        = require('imagemin-pngquant'),
    plumber         = require('gulp-plumber'),
    connect         = require('gulp-connect');

// Configure file paths
var path = {
    DEST: 'dist/',
    SRC: 'src/',
    INCLUDES: 'include/',
    LESS_SRC: 'src/frontend/less/',
    LESS_MANIFEST: 'src/frontend/less/all.less',
    CSS_DEST: 'dist/frontend/css/',
    JS_SRC: 'src/frontend/js/',
    JS_MINIFIED_OUT: 'all.js',
    JS_DEST: 'dist/frontend/js',
    IMG_SRC: 'src/frontend/img/',
    IMG_DEST: 'dist/frontend/img/',
};

// Clean out build folder each time Gulp runs
gulp.task('clean', function (cb) {
    del([
        path.DEST
    ], cb);
});

// Compile LESS
gulp.task('less', function(){
    return gulp.src(path.LESS_MANIFEST)
        .pipe(plumber())
        .pipe(sourcemaps.init())
        .pipe(less())
        .pipe(sourcemaps.write('./'))
        .pipe(gulp.dest(path.CSS_DEST));
    // Copy src folders into dist folder
    // gulp.src(path.LESS_SRC + '**')
        // .pipe(gulp.dest(path.CSS_DEST + 'less/'));
});

// Allow HTML files to be included
gulp.task('html', function() {
    return gulp.src([path.SRC + '*.html'])
        .pipe(connect.reload())
        .pipe(plumber())
        .pipe(fileinclude({
            prefix: '@@',
            basepath: path.INCLUDES
        }))
        .pipe(gulp.dest(path.DEST));
});

// Concatenate and minify JavaScript
gulp.task('js', function() {
    return gulp.src(path.JS_SRC + '**/*.js')
        .pipe(order([
            path.JS_SRC + 'framework/*.js',
            path.JS_SRC + 'vendor/*.js',
            path.JS_SRC + 'client/*.js'
        ], {base: '.'} ))
        .pipe(concat(path.JS_MINIFIED_OUT))
        .pipe(uglify())
        .pipe(gulp.dest(path.JS_DEST));
});

// Minify images
gulp.task('imagemin', function () {
    return gulp.src(path.IMG_SRC + '*')
        .pipe(imagemin({
            progressive: true,
            use: [pngquant()]
        }))
        .pipe(gulp.dest(path.IMG_DEST));
});

// Copy folders
gulp.task('copy', function() {
    return gulp.src(path.SRC + 'extjs/*')
        .pipe(gulp.dest(path.DEST + 'extjs/'));
});

// Watch files
gulp.task('watch', function(){
    gulp.watch(path.LESS_SRC + '**/*.less', ['less']);
    gulp.watch(path.SRC + '*.html', ['html']);
    gulp.watch(path.JS_SRC + '**/*.js', ['js']);
});

// Connect to a server and livereload pages
gulp.task('connect', function() {
    connect.server({
        root: path.DEST,
        livereload: true
    });
});

// Default task
gulp.task('default', [
                    'clean',
                    'less',
                    'html',
                    'js',
                    'imagemin',
                    'copy',
                    'watch',
                    'connect'
                    ]);

通常每次运行此操作时，我都会在控制台中出现某种错误，并且在终端中运行gulp后，它并没有完全删除dist /文件夹。

[14:34:12] Using gulpfile ~/Desktop/outerbox/odot/Gulpfile.js
[14:34:12] Starting 'clean'...
[14:34:12] Starting 'less'...
[14:34:12] Starting 'html'...
[14:34:12] Starting 'js'...
[14:34:12] Starting 'imagemin'...
[14:34:12] Starting 'copy'...
[14:34:12] Starting 'watch'...
[14:34:12] Finished 'watch' after 16 ms
[14:34:12] Starting 'connect'...
[14:34:12] Finished 'connect' after 7.64 ms
[14:34:12] Server started http://localhost:8080
[14:34:12] LiveReload started on port 35729
[14:34:13] Finished 'html' after 303 ms
[14:34:13] 'clean' errored after 360 ms
[14:34:13] Error: ENOTEMPTY, rmdir '/Users/jacobtarr/Desktop/outerbox/odot/dist'
    at Error (native)
[14:34:13] 'js' errored after 340 ms
[14:34:13] Error: ENOENT, stat '/Users/jacobtarr/Desktop/outerbox/odot/dist/frontend/js/all.js'
    at Error (native)
[14:34:13] 'copy' errored after 330 ms
[14:34:13] Error: ENOENT, stat '/Users/jacobtarr/Desktop/outerbox/odot/dist/extjs/ext-all.js'
    at Error (native)
[14:34:13] Finished 'less' after 388 ms
[14:34:14] gulp-imagemin: Minified 30 images (saved 139.74 kB - 17.5%)
[14:34:14] Finished 'imagemin' after 1.49 s

如何修复此错误？如何在运行gulp之前正确刷出dist /文件夹？