Question

我最近将现有的Angular 6应用程序升级到了Angular7。我的大多数应用程序都基于Angular 6构建，然后我对其进行了升级。

这是我的package.json：

{
  "name": "app-name",
  "version": "0.0.0",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@agm/core": "^1.0.0-beta.5",
    "@angular/animations": "^7.0.0",
    "@angular/cdk": "^7.0.0",
    "@angular/common": "^7.0.0",
    "@angular/compiler": "^7.0.0",
    "@angular/core": "^7.0.0",
    "@angular/fire": "^5.0.2",
    "@angular/forms": "^7.0.0",
    "@angular/http": "^7.0.0",
    "@angular/material": "^7.0.0",
    "@angular/platform-browser": "^7.0.0",
    "@angular/platform-browser-dynamic": "^7.0.0",
    "@angular/router": "^7.0.0",
    "bootstrap": "^4.1.3",
    "core-js": "^2.5.4",
    "firebase": "^5.5.1",
    "npm": "^6.4.1",
    "rxjs": "^6.3.3",
    "sweetalert2": "^7.28.7",
    "zone.js": "^0.8.26"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "~0.6.8",
    "@angular/cli": "~7.0.2",
    "@angular/compiler-cli": "^7.0.0",
    "@angular/language-service": "^7.0.0",
    "@types/googlemaps": "^3.30.13",
    "@types/jasmine": "~2.8.6",
    "@types/jasminewd2": "~2.0.3",
    "@types/node": "~8.9.4",
    "codelyzer": "~4.2.1",
    "jasmine-core": "~2.99.1",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~1.7.1",
    "karma-chrome-launcher": "~2.2.0",
    "karma-coverage-istanbul-reporter": "~2.0.0",
    "karma-jasmine": "~1.1.1",
    "karma-jasmine-html-reporter": "^0.2.2",
    "protractor": "~5.3.0",
    "ts-node": "~5.0.1",
    "tslint": "~5.9.1",
    "typescript": "~3.1.3"
  }
}

这是我在运行ng build --prod时收到的警告：

C:\Development\Angular\MyApp>ng build --prod
Date: 2018-10-24T17:36:28.367Z
Hash: a03e526b7e8175b25c06
Time: 32695ms
chunk {0} 0.cafd68819f30185de9af.js () 74.8 kB  [rendered]
chunk {1} 1.00224f689303f6e8aae8.js () 33.7 kB  [rendered]
chunk {2} 2.c9d485747518d5177cf8.js () 29.7 kB  [rendered]
chunk {3} 3.e25546a8136eb13e9af3.js () 31.5 kB  [rendered]
chunk {4} 4.120580aa06e187956a3a.js () 51.3 kB  [rendered]
chunk {5} 5.890208a2f9c910b04821.js () 62.8 kB  [rendered]
chunk {6} 6.659eb84df5c798c5ff39.js () 29.4 kB  [rendered]
chunk {7} runtime.4ee86023cc00ae14666e.js (runtime) 1.99 kB [entry] [rendered]
chunk {8} styles.f6067b501f9d2a5208bf.css (styles) 215 kB [initial] [rendered]
chunk {9} polyfills.644a401562606166b860.js (polyfills) 59.6 kB [initial] [rendered]chunk {10} main.be4cab576441165d61f9.js (main) 1.13 MB [initial] [rendered]
WARNING in ./src/app/tv/components/add-program-card/add-program-card.component.ngfactory.js
31:52-87 "export 'ɵangular_packages_forms_forms_bh' (imported as 'i2') was not found in '@angular/forms'

WARNING in ./src/app/tv/components/edit-program-card/edit-program-card.component.ngfactory.js
31:52-87 "export 'ɵangular_packages_forms_forms_bh' (imported as 'i2') was not found in '@angular/forms'

WARNING in ./src/app/news/components/edit-article-card/edit-article-card.component.ngfactory.js
33:52-87 "export 'ɵangular_packages_forms_forms_bh' (imported as 'i2') was not found in '@angular/forms'

WARNING in ./src/app/news/components/add-news-card/add-news-card.component.ngfactory.js
33:52-87 "export 'ɵangular_packages_forms_forms_bh' (imported as 'i2') was not found in '@angular/forms'

WARNING in ./src/app/team/components/add-player-card/add-player-card.component.ngfactory.js
33:52-87 "export 'ɵangular_packages_forms_forms_bh' (imported as 'i2') was not found in '@angular/forms'

WARNING in ./src/app/team/components/edit-player-card/edit-player-card.component.ngfactory.js
33:52-87 "export 'ɵangular_packages_forms_forms_bh' (imported as 'i2') was not found in '@angular/forms'

WARNING in ./src/app/boutique/components/add-merchandise-card/add-merchandise-card.component.ngfactory.js
39:52-87 "export 'ɵangular_packages_forms_forms_bh' (imported as 'i6') was not found in '@angular/forms'

WARNING in ./src/app/boutique/components/edit-merchandise-card/edit-merchandise-card.component.ngfactory.js
39:52-87 "export 'ɵangular_packages_forms_forms_bh' (imported as 'i6') was not found in '@angular/forms'

WARNING in ./src/app/games/components/edit-game-card/edit-game-card.component.ngfactory.js
45:52-87 "export 'ɵangular_packages_forms_forms_bh' (imported as 'i2') was not found in '@angular/forms'

WARNING in ./src/app/games/components/add-game-card/add-game-card.component.ngfactory.js
45:52-87 "export 'ɵangular_packages_forms_forms_bh' (imported as 'i2') was not found in '@angular/forms'

WARNING in ./src/app/components/login/login.component.ngfactory.js
49:53-88 "export 'ɵangular_packages_forms_forms_bh' (imported as 'i5') was not found in '@angular/forms'

最初我不太喜欢这些警告。但是，当我尝试导航到Firebase Hosting上托管的应用程序时，我的应用程序未加载，并且在控制台上也出现此错误：

Uncaught TypeError: e is not a constructor
    at main.be4cab576441165d61f9.js:1
    at Xr (main.be4cab576441165d61f9.js:1)
    at main.be4cab576441165d61f9.js:1
    at new t (main.be4cab576441165d61f9.js:1)
    at Object.mi [as createNgModuleRef] (main.be4cab576441165d61f9.js:1)
    at e.create (main.be4cab576441165d61f9.js:1)
    at main.be4cab576441165d61f9.js:1
    at e.invoke (polyfills.644a401562606166b860.js:1)
    at Object.onInvoke (main.be4cab576441165d61f9.js:1)
    at e.invoke (polyfills.644a401562606166b860.js:1)

到目前为止我已经尝试过的事情：

搜索了ɵangular_packages_forms_forms_bh，发现它在angular/forms-builds/bundles/forms.umd.min.js.map中被引用，并被更新了约20分钟。以前，但不知道该怎么做。
在此 GitHub Issue 中发现了类似的问题，该问题指向 this comment ，但看起来与我的无关错误。它表明我需要从src/index.ts导出所有我目前没有的东西。

有人可以向我指出正确的方向，如何解决此错误吗？

更新

我在实现SharedModule的{{1}}中创建了一个自定义表单控件元素。这是相同的模板：

ControlValueAccessor

这些警告与此有关吗？

Answer 1

从Angular 6升级到Angular 7后，我有相同的警告和错误。我已删除我的 node_modules 文件夹，然后再次 npm install 。现在，编译成功完成，没有警告，而且我也没有错误“ Uncaught TypeError：e不是构造函数” 。

--prod生成警告并在升级到Angular 7后无法加载已部署的应用程序

更新

1 个答案: