title: Error: Can't resolve 'core-js/es7/reflect' in '\node_modules\@angular-devkit\build-angular\src\angular-cli-files\models
body: <p>After updating to Angular 7.3.6, I get the following error on ng serve:</p>
  
  <p><a href="https://i.stack.imgur.com/XCSsR.png" rel="noreferrer"><img src="https://i.stack.imgur.com/XCSsR.png" alt="enter image description here"></a></p>
  
  <blockquote>
    <p>ERROR in
    ./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
    '\node_modules@angular-devkit\build-angular\src\angular-cli-files\models'</p>
  </blockquote>
  
  <p>Here is my package.json dependecies: </p>
  
  <pre><code>{
    "name": "frontend",
    "version": "0.0.0",
    "license": "MIT",
    "scripts": {
      "ng": "ng",
      "start": "ng serve",
      "build": "ng build --prod",
      "test": "ng test",
      "lint": "ng lint",
      "e2e": "ng e2e"
    },
    "private": true,
    "dependencies": {
      "@angular/animations": "^7.2.11",
      "@angular/cdk": "^7.3.6",
      "@angular/common": "^7.2.11",
      "@angular/compiler": "^7.2.11",
      "@angular/core": "^7.2.11",
      "@angular/flex-layout": "^7.0.0-beta.24",
      "@angular/forms": "^7.2.11",
      "@angular/http": "^7.2.11",
      "@angular/material": "^7.3.6",
      "@angular/platform-browser": "^7.2.11",
      "@angular/platform-browser-dynamic": "^7.2.11",
      "@angular/router": "^7.2.11",
      "adm-zip": "^0.4.13",
      "core-js": "^2.6.5",
      "hammerjs": "^2.0.8",
      "rxjs": "^6.4.0",
      "rxjs-compat": "^6.0.0-rc.0",
      "tslib": "^1.9.3",
      "zone.js": "^0.9.0"
    },
    "devDependencies": {
      "@angular-devkit/build-angular": "^0.13.7",
      "@angular/cli": "^7.3.7",
      "@angular/compiler-cli": "^7.2.11",
      "@angular/language-service": "^7.2.11",
      "@types/jasmine": "~3.3.12",
      "@types/jasminewd2": "~2.0.6",
      "@types/node": "~11.12.0",
      "codelyzer": "^5.0.0",
      "jasmine-core": "~3.3.0",
      "jasmine-spec-reporter": "~4.2.1",
      "karma": "^4.0.1",
      "karma-chrome-launcher": "~2.2.0",
      "karma-coverage-istanbul-reporter": "^2.0.5",
      "karma-jasmine": "~2.0.1",
      "karma-jasmine-html-reporter": "^1.4.0",
      "protractor": "^6.0.0",
      "ts-node": "~8.0.3",
      "tslint": "~5.14.0",
      "typescript": "3.1.6"
    }
  }
  </code></pre>