Angularjs ./~/firebase/app/shared_promise.js中出错

我正在尝试用AngularFire2创建Angular2应用程序

我跟着

每次我尝试在我的应用程序模块中导入AngularFireModule，然后在导入中执行AngularFireModule.initializeApp（config），当我尝试运行ng serve时，我都会遇到以下错误：

ERROR in ./~/firebase/app/shared_promise.js
Module not found: Error: Can't resolve 'promise-polyfill' in 
'C:\Users\username\Desktop\demo-app\node_modules\firebase\app'
@ ./~/firebase/app/shared_promise.js 22:35-62
@ ./~/firebase/app/firebase_app.js
@ ./~/firebase/app.js
@ ./~/firebase/firebase-browser.js
@ ./~/angularfire2/angularfire2.js
@ ./~/angularfire2/index.js
@ ./src/app/app.module.ts
@ ./src/main.ts
@ multi webpack-dev-server/client?http://localhost:4200 ./src/main.ts
webpack: Failed to compile.

我的package.json就是这样的：

 {
     "name": "xxxxx",
     "version": "0.0.0",
     "license": "MIT",
     "scripts": {
     "ng": "ng",
     "start": "ng serve",
     "build": "ng build",
     "test": "ng test",
     "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular/common": "^2.4.0",
    "@angular/compiler": "^2.4.0",
    "@angular/core": "^2.4.0",
    "@angular/forms": "^2.4.0",
    "@angular/http": "^2.4.0",
    "@angular/platform-browser": "^2.4.0",
    "@angular/platform-browser-dynamic": "^2.4.0",
    "@angular/router": "^3.4.0",
    "angularfire2": "^2.0.0-beta.8",
    "core-js": "^2.4.1",
    "firebase": "^3.7.8",
    "rxjs": "^5.1.0",
    "zone.js": "^0.7.6"
  },
  "devDependencies": {
    "@angular/cli": "1.0.0-rc.0",
    "@angular/compiler-cli": "^2.4.0",
    "@types/jasmine": "2.5.38",
    "@types/node": "~6.0.60",
    "codelyzer": "~2.0.0",
    "jasmine-core": "~2.5.2",
    "jasmine-spec-reporter": "~3.2.0",
    "karma": "~1.4.1",
    "karma-chrome-launcher": "~2.0.0",
    "karma-cli": "~1.0.1",
    "karma-jasmine": "~1.1.0",
    "karma-jasmine-html-reporter": "^0.2.2",
    "karma-coverage-istanbul-reporter": "^0.2.0",
    "protractor": "~5.1.0",
    "ts-node": "~2.0.0",
    "tslint": "~4.4.2",
    "typescript": "~2.0.0"
  }
}

它对我有用

npm install promise-polyfill --save-exact

在命令提示符下，粘贴此命令并运行它，

---

我也遇到了同样的问题，这篇文章帮助我解决了这个问题。

firebase npm包版本3.7.8中缺少“promise polyfill”依赖项，您可以安装“promise polyfill”或将firebase包降级为3.7.7

如果希望将依赖项也保存在package.json中，请确保包括--save标志和--save-exact

npm install promise-polyfill --save --save-exact

---

下面完全解决了我的问题

npm install promise-polyfill --save --save-exact

---

您是否在

app.module.ts

at

AngularFireModule

和NgModule内导入了用于导入的内容？是的，我在app.module.tsI中导入了4。AngularFire2的安装指南中有Setup@NgModule，我正按照指南中的说明进行操作，但幸运的是，您的软件包名称中没有输入错误。@Vitali Kniazeu:谢谢！现在已修复。适用于错误：无法解决“promise polyfill”！！！！谢谢

npm install promise-polyfill --save --save-exact