小编And*_*res的帖子

我遇到错误：

./node_modules/ng2-charts/fesm2015/ng2-charts.js 中的错误

找不到模块：错误：无法解析/node_modules/ng2-charts/fesm2015 中的“chart.js”

我做了“npm install --save ng2-charts”。你能帮我理解为什么会抛出这个错误吗？

我的 package.json

"dependencies": {
"@angular/animations": "~8.2.9",
"@angular/common": "~8.2.9",
"@angular/compiler": "~8.2.9",
"@angular/core": "~8.2.9",
"@angular/fire": "^5.2.3",
"@angular/forms": "~8.2.9",
"@angular/platform-browser": "~8.2.9",
"@angular/platform-browser-dynamic": "~8.2.9",
"@angular/router": "~8.2.9",
"@ngrx/store": "^8.6.0",
"@ngrx/store-devtools": "^8.6.0",
"bootstrap": "^4.4.1",
"firebase": "^7.6.0",
"ng2-charts": "^2.2.3",
"rxjs": "~6.4.0",
"sweetalert2": "^9.5.3",
"tslib": "^1.10.0",
"zone.js": "~0.9.1" }

"devDependencies": {
"@angular-devkit/build-angular": "^0.803.21",
"@angular/cli": "~8.3.8",
"@angular/compiler-cli": "~8.2.9",
"@angular/language-service": "~8.2.9",
"@types/jasmine": "~3.3.8",
"@types/jasminewd2": "~2.0.3",
"@types/node": "~8.9.4",
"codelyzer": "^5.0.0",
"jasmine-core": "~3.4.0",
"jasmine-spec-reporter": "~4.2.1",
"karma": "~4.1.0",
"karma-chrome-launcher": "~2.2.0",
"karma-coverage-istanbul-reporter": "~2.0.1", …

以下代码可用于在 Firebase 中创建新用户，但在浏览器中出现以下错误，您能帮我理解为什么吗？

使用无效数据调用函数 DocumentReference.set()。不支持的字段值：未定义（在字段名称中找到）

代码：

export class AuthService {

  private userSubscription: Subscription = new Subscription();

  constructor(private afAuth: AngularFireAuth,
    private router: Router,
    private afDB: AngularFirestore,
    private store: Store<AppState>) { }

initAuthListener() {

    this.afAuth.authState.subscribe((fbUser: firebase.User) => {
      if (fbUser) {
        this.userSubscription = this.afDB.doc(`${fbUser.uid}/usuario`).valueChanges()
          .subscribe((usuarioObj: any) => {

            const newUser = new User(usuarioObj)

            this.store.dispatch(new SetUserAction(newUser))

          })
      } else {
        this.userSubscription.unsubscribe()
      }
    })
  }

  createUser(nombre: string, email: string, password: string) {

    this.store.dispatch(new ActivarLoadingAction())

    this.afAuth.auth
      .createUserWithEmailAndPassword(email, password)
      .then(resp => {


        const user: User = …

我遇到这个错误：

error TS2488: Type 'Usuario' must have a '[Symbol.iterator]()' method
that returns an iterator.

我的代码：

usuarios.reducers.ts

export interface UsuarioState {
    users: Usuario[];
    loaded: boolean;
    loading: boolean;
    error: any;
}

const initState: UsuarioState = {
    users: [],
    loaded: false,
    loading: false,
    error: null
}

export function usuariosReducer(state = initState, action: fromUsuariosActions.usuariosAcciones): UsuarioState {

    switch (action.type) {

        case fromUsuariosActions.CARGAR_USUARIOS: 
            return {
                ...state,
                loading: true
            }

        case fromUsuariosActions.CARGAR_USUARIOS_SUCCESS:
            return {
                ...state,
                loading: false,
                loaded: true,
                users:[...action.usuarios]
            }

截屏：

我已经添加"es5", "dom.iterable"到我的tsconfig.json …

运行“npm install”后出现这些错误，我运行了“npm install --g --product windows-build-tools”，我还删除了 node_modules、package-lock.json 并安装了 Visual Studio Community 2019但仍然有同样的问题...

C:\Users\myuser\Documents\GitHub\myRepo\node_modules\snappy> if not defined npm_config_node_gyp
"C:\Users\myuser\Documents\GitHub\myRepo\node_modules\npm-lifecycle\node-gyp-bin\\..\..\node_modules\node-gyp\bin\node-gyp.js" rebuild )
 else (node "C:\Program Files\nodejs\node_modules\npm\node_modules\node-gyp\bin\node-gyp.js" rebuild )
Building the projects in this solution one at a time. To enable parallel build, please add the "-m" switch.

gyp ERR! find VS
gyp ERR! find VS msvs_version not set from command line or npm config
gyp ERR! find VS VCINSTALLDIR not set, not running in VS Command Prompt
gyp ERR! find VS checking …