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Module Not Found Error Can T Resolve Classlist Js

Hi here is what I am doing, I have upgraded the core-js to 3.1.3.
Here is my package.json file

            {   "name": "apex",   "version": "4.1.0",   "license": "",   "scripts": {     "start-server": "node server.js",     "ng": "ng",     "start": "ng serve",     "build": "ng build",     "master-build": "ng build --prod --named-chunks",     "test": "ng test",     "lint": "ng lint",     "e2e": "ng e2e"   },   "private": true,   "dependencies": {     "@agm/core": "^1.0.0-beta.5",     "@agm/js-marker-clusterer": "^1.0.0-beta.5",     "@angular/animations": "^6.1.10",     "@angular/common": "^6.1.10",     "@angular/compiler": "^6.1.10",     "@angular/core": "^6.1.10",     "@angular/forms": "^6.1.10",     "@angular/http": "^6.1.10",     "@angular/platform-browser": "^6.1.10",     "@angular/platform-browser-dynamic": "^6.1.10",     "@angular/platform-server": "^6.1.10",     "@angular/router": "^6.1.10",     "@ng-bootstrap/ng-bootstrap": "^1.0.4",     "@ngrx/store": "^5.2.0",     "@ngx-share/core": "^6.0.1",     "@ngx-translate/core": "^9.0.2",     "@ngx-translate/http-loader": "^2.0.1",     "@qontu/ngx-inline-editor": "^0.2.0-alpha.12",     "@swimlane/ngx-charts": "^7.1.0",     "@types/chartist": "^0.9.44",     "@types/d3-shape": "^1.3.1",     "agm-direction": "^0.5.9",     "angular-calendar": "^0.23.7",     "angular-formio": "^3.16.2",     "angular-wizard-form": "^0.4.1",     "angular2-signaturepad": "^2.8.0",     "angular2-wizard": "^0.4.0",     "angularfire2": "^5.1.3",     "bootstrap": "^4.3.1",     "bootstrap-material-design": "^4.1.1",     "bourbon": "^4.3.4",     "chartist": "^0.11.0",     "classlist.js": "^1.1.20150312",     "core-js": "3.1.3",     "d3": "^4.13.0",     "firebase": "^5.11.1",     "intl": "^1.2.5",     "jquery": "^3.4.1",     "js-marker-clusterer": "^1.0.0",     "jspdf": "^1.5.3",     "moment": "^2.24.0",     "ng-chartist": "^1.1.1",     "ng-lazyload-image": "^5.1.2",     "ng-socket-io": "^0.2.4",     "ng2-charts": "^1.6.0",     "ng2-ckeditor": "1.2.2",     "ng2-file-upload": "^1.3.0",     "ng2-nouislider": "^1.8.2",     "ng2-select2": "^1.0.0-beta.16",     "ng2-validation": "^4.2.0",     "ngx-chips": "^1.9.8",     "ngx-color-picker": "^5.3.8",     "ngx-text-overflow-clamp": "0.0.1",     "ngx-toastr": "^9.2.0",     "ngx-ui-switch": "^1.6.0",     "node-sass": "^4.10.0",     "nouislider": "^11.0.3",     "ramda": "0.25.0",     "resize-observer-polyfill": "^1.5.1",     "rxjs": "6.0.0",     "rxjs-compat": "6.2.2",     "screenfull": "^3.3.3",     "select2": "4.0.6-rc.1",     "slick-carousel": "^1.8.1",     "sweetalert2": "^7.33.1",     "web-animations-js": "^2.2.5",     "zone.js": "^0.8.29"   },   "devDependencies": {     "@angular-devkit/build-angular": "^0.11.4",     "@angular/cli": "^6.2.9",     "@angular/compiler-cli": "^6.1.10",     "@angular/language-service": "^6.1.10",     "@types/core-js": "^0.9.43",     "@types/jasmine": "^2.8.16",     "@types/jquery": "^3.3.29",     "@types/jspdf": "^1.3.0",     "@types/node": "^9.6.48",     "@types/slick-carousel": "^1.6.33",     "agm-overlays": "^1.3.3",     "codelyzer": "^4.5.0",     "jasmine-core": "^2.99.1",     "jasmine-spec-reporter": "^4.2.1",     "karma": "^3.1.4",     "karma-chrome-launcher": "^2.2.0",     "karma-cli": "~1.0.1",     "karma-coverage-istanbul-reporter": "^1.4.3",     "karma-jasmine": "^1.1.2",     "karma-jasmine-html-reporter": "^0.2.2",     "protractor": "^5.4.2",     "ts-node": "^4.1.0",     "tslint": "^5.16.0",     "typescript": "2.7.2"   } }                      

and here is my polyyfills file

            /**  * This file includes polyfills needed by Angular and is loaded before the app.  * You can add your own extra polyfills to this file.  *  * This file is divided into 2 sections:  *   1. Browser polyfills. These are applied before loading ZoneJS and are sorted by browsers.  *   2. Application imports. Files imported after ZoneJS that should be loaded before your main  *      file.  *  * The current setup is for so-called "evergreen" browsers; the last versions of browsers that  * automatically update themselves. This includes Safari >= 10, Chrome >= 55 (including Opera),  * Edge >= 13 on the desktop, and iOS 10 and Chrome on mobile.  *  * Learn more in https://angular.io/docs/ts/latest/guide/browser-support.html  */  /***************************************************************************************************  * BROWSER POLYFILLS  */  /** IE9, IE10 and IE11 requires all of the following polyfills. **/ import 'core-js/es/symbol'; import 'core-js/es/object'; import 'core-js/es/function'; import 'core-js/es/parse-int'; import 'core-js/es/parse-float'; import 'core-js/es/number'; import 'core-js/es/math'; import 'core-js/es/string'; import 'core-js/es/date'; import 'core-js/es/array'; import 'core-js/es/regexp'; import 'core-js/es/map'; import 'core-js/es/weak-map'; import 'core-js/es/set';  /** IE10 and IE11 requires the following for NgClass support on SVG elements */ import 'classlist.js';  // Run `npm install --save classlist.js`.  /** IE10 and IE11 requires the following to support `@angular/animation`. */ import 'web-animations-js';  // Run `npm install --save web-animations-js`.   /** Evergreen browsers require these. **/ import 'core-js/es/reflect'; (window as any).global = window;  /** ALL Firefox browsers require the following to support `@angular/animation`. **/ import 'web-animations-js';  // Run `npm install --save web-animations-js`.    /***************************************************************************************************  * Zone JS is required by Angular itself.  */ import 'zone.js/dist/zone';  // Included with Angular CLI.    /***************************************************************************************************  * APPLICATION IMPORTS  */  /* ngx-charts required polyfill ie11 */ import 'core-js/es/array';  /**  * Date, currency, decimal and percent pipes.  * Needed for: All but Chrome, Firefox, Edge, IE11 and Safari 10  */ // import 'intl';  // Run `npm install --save intl`. /**  * Need to import at least one locale-data with intl.  */ // import 'intl/locale-data/jsonp/en';  // Add global to window, assigning the value of window itself. (window as any).global = window;                      

but ng is unable to build the source code it is throwing the error, that is confusing

            Failed to compile.  ./node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/jit-polyfills.js Module not found: Error: Can't resolve 'core-js/es7/reflect' in 'E:\xampp\htdocs\vpanel\node_modules\@angular-devkit\build-angular\src\angular-cli-files\models'                      

Can someone help me in?

Module Not Found Error Can T Resolve Classlist Js

Source: https://github.com/zloirock/core-js/issues/573