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Когда я пытаюсь запустить gulp default команду в git bash, произошла ошибка!

Ошибка утверждения [ERR_ASSERTION]: функция задачи должна быть указана в Gulp.set [как _setTask] (C:wamp64wwwWP-PROJECTSthfireplaces.cademo_newwp-contentthemesthfireplacesnode_modulesundertakerlibset-task.js:10:3 ) залпом.задание (C:wamp64wwwWP-PROJECTSthfireplaces.cademo_newwp-contentthemesthfireplacesnode_modulesundertakerlibtask.js:13:8 ) на Объекте. (C:wamp64wwwWP-PROJECTSthfireplaces.cademo_newwp-contentthemesthfireplacesgulpfile.js:181:6 ) в модуле._compile (internal/modules/cjs/loader.js:955:30) в объекте.Module._extensions..js (внутренний/modules/cjs/loader.js:991:10) в модуле.загрузка (internal/modules/cjs/loader.js:811:32) в функции.Модуль._load (internal/modules/cjs/loader.js:723:14) в Module.require (internal/modules/cjs/loader.js:848:19) в require (internal/modules/cjs/helpers.js:74:18) в requireOrImport (C:UsersMomin Эр-РиядAppDataРоуминг npm node_modulesgulp node_modulesgulp-clilib sharedrequire-or-import.js:19:11) { Генерируемое сообщение: false, код: ‘ERR_ASSERTION’, фактическое: false, ожидаемое: true, оператор: ‘==’ }

Вот сведения о моей машине версия узла версия 12.14.1 npm 7.0.2 локальная версия gulp 4.0.2 !

package.json

 {
  "name": "instaHtmlQuickPack",
  "version": "0.6.5",
  "description": "Html Quick Pack",
  "main": "index.js",
  "scripts": {
    "postinstall": "gulp default"
  },
  "engines": {
    "npm": ">=2.1.8"
  },
  "repository": {
    "type": "git",
    "url": "#"
  },
  "keywords": [
    "wordpress",
    "theme",
    "bootstrap"
  ],
  "author": "Azizul Hoq",
  "license": "GPL-2.0",
  "bugs": {
    "url": "#"
  },
  "homepage": "#",
  "dependencies": {
    "bootstrap": "4.3.1",
    "browser-sync": "^2.18.12",
    "del": "^3.0.0",
    "gulp": "^4.0.0",
    "gulp-clean-css": "^3.7.0",
    "gulp-clone": "^1.0.0",
    "gulp-concat": "^2.6.1",
    "gulp-cssnano": "^2.1.2",
    "gulp-ignore": "^2.0.2",
    "gulp-imagemin": "^3.3.0",
    "gulp-merge": "^0.1.1",
    "gulp-plumber": "^1.1.0",
    "gulp-rename": "^1.2.2",
    "gulp-rimraf": "^0.2.1",
    "gulp-sass": "^3.1.0",
    "gulp-sequence": "^0.4.6",
    "gulp-sourcemaps": "2.6.0",
    "gulp-uglify": "^3.0.0",
    "gulp-watch": "^4.3.11",
    "jquery": "3.2.1",
    "merge2": "^1.1.0",
    "popper.js": "^1.11.1",
    "run-sequence": "^2.0.0"
  },
  "devDependencies": {
    "gulp-autoprefixer": "^4.0.0",
    "gulp-csscomb": "^3.0.8",
    "gulp-filenames": "^4.0.1"
  }
}

  

gulpfile.js

 // Defining base pathes
var basePaths = {
    node: './node_modules/',
    src: './src/',
    assets: './assets/',
    vendorsCss: './src/vendors/css/',
    vendorsJs: './src/vendors/js/'
};

var jsFileList = [
        basePaths.vendorsJs '*.js',
        basePaths.src 'js/custom-script.js'
    ];

var cssFileList = [
        basePaths.vendorsCss '*.css'
    ];
    

   // console.log(jsFileList);

// Defining requirements
var gulp = require('gulp');
var plumber = require('gulp-plumber');
var sass = require('gulp-sass');
var watch = require('gulp-watch');
var minifyCSS = require('gulp-cssnano');
var rename = require('gulp-rename');
var concat = require('gulp-concat');
var uglify = require('gulp-uglify');
var merge2 = require('merge2');
var ignore = require('gulp-ignore');
var del = require('del');
var sourcemaps = require('gulp-sourcemaps');
var autoprefixer = require('gulp-autoprefixer');
var csscomb = require('gulp-csscomb');
var imagemin = require('gulp-imagemin');
var browserSync = require('browser-sync').create();


// browser-sync watched files
// automatically reloads the page when files changed
var browserSyncWatchFiles = [
    basePaths.assets 'css/*.css',
    basePaths.assets 'js/*.js',
    basePaths.src 'media/**',
    './*.html',
    './*.php'
];

var browserSyncOptions = {
    proxy: "http://localhost/WP-PROJECTS/thfireplaces.ca/demo_new/",
    notify: false
};

// Run:
// gulp browser-sync
// Starts browser-sync task for starting the server.
gulp.task('browser-sync', function() {
    browserSync.init(browserSyncWatchFiles, browserSyncOptions);
});

// Run:
// gulp sass
// Compiles SCSS files in CSS
gulp.task('sass', function () {
    gulp.src(basePaths.src 'sass/*.scss')
        .pipe(plumber())
        .pipe(sourcemaps.init())
        .pipe(sass())
        .pipe(autoprefixer())
        .pipe(sourcemaps.init({loadMaps: true}))
        .pipe(sourcemaps.write('.'))
        // .pipe(csscomb())
        .pipe(gulp.dest(basePaths.assets 'css'))
        .pipe(browserSync.stream());
});


// Run:
// gulp concat-css
// concat css file from src
gulp.task('concat-css', function() {
    return gulp.src(cssFileList)
        .pipe(plumber())
        .pipe(concat('bundle.css'))
        .pipe(gulp.dest(basePaths.assets 'css/'))
        .pipe(browserSync.stream());
});

// Run:
// gulp concat-js
// concat js file from src
gulp.task('concat-js', function() {
    return gulp.src(jsFileList)
        .pipe(plumber())
        .pipe(concat('bundle.js'))
        .pipe(gulp.dest(basePaths.assets 'js/'))
        .pipe(browserSync.stream());
});


// Run:
// gulp minifycss
// Minifies CSS files
gulp.task('minifycss',  function(){
  return gulp.src([basePaths.assets 'css/bundle.css', basePaths.assets 'css/theme.css'])
    .pipe(plumber())
    .pipe(concat('theme.min.css'))
    .pipe(minifyCSS({keepBreaks:false,safe: true}))
    .pipe(minifyCSS({
            reduceIdents: {
                keyframes: false
            },
            discardUnused: {
                keyframes: false
            },
            discardComments: {
                removeAll: true
            }
        }
    ))
    .pipe(gulp.dest(basePaths.assets 'css/'));
});

// Run:
// gulp minifyjs
// Minifies js files
gulp.task('minifyjs', function() {
    return gulp.src(basePaths.assets 'js/bundle.js')
        .pipe(plumber())
        // .pipe(concat('bundle.min.js'))
        .pipe(rename({suffix: '.min'}))
        .pipe(uglify())
        .pipe(gulp.dest(basePaths.assets 'js/'));
});


// Run:
// gulp clean
// Remove file
gulp.task('clean', function () {
  return del([
    'css/*',
    // here we use a globbing pattern to match everything inside the `mobile` folder
    'js/*.js',
    // we don't want to clean this file though so we negate the pattern
    '!css/*.min.css',
    '!js/*.min.js'
  ]);
});




// Run:
// gulp imagemin
// Running image optimizing task
gulp.task('imagemin', function(){
    gulp.src(basePaths.src 'img/**')
    .pipe(imagemin())
    .pipe(gulp.dest(basePaths.assets 'img/'))
});


// Run:
// gulp watch
// Starts watcher. Watcher runs gulp sass task on changes
gulp.task('watch', function () {
    // gulp.watch(basePaths.src 'sass/**/*.scss', ['sass']);
    gulp.watch(basePaths.src 'sass/**/*.scss', gulp.series('sass'));
    gulp.watch(cssFileList,gulp.series('concat-css'));
    gulp.watch(jsFileList,gulp.series('concat-js'));
    gulp.watch(basePaths.src 'img/**', gulp.series('imagemin'));
    //gulp.watch('browser-sync');
});



//task register
// gulp.task('default', ['watch', 'sass', 'concat-css', 'concat-js', 'browser-sync']);
// gulp.task('build', ['sass', 'concat-css', 'concat-js', 'minifycss', 'minifyjs', 'imagemin']);

gulp.task('default', gulp.series('watch', 'sass', 'concat-css', 'concat-js', 'browser-sync'));
gulp.task('build', gulp.series('sass', 'concat-css', 'concat-js', 'minifycss', 'minifyjs', 'imagemin'));