Firebase导入未在构造函数离子原生中初始化

Question

我正在研究离子fcm推送通知。我已经进口了

import { Firebase } from '@ionic-native/firebase';但我无法在构造函数中初始化Firebase。这是我的代码

import { Injectable } from '@angular/core';
import { Firebase } from '@ionic-native/firebase';
import { Platform } from 'ionic-angular';
import {HttpClient, HttpHeaders} from '@angular/common/http';

@Injectable()
export class FcmProvider {

  constructor(private platform: Platform, 
              public firebaseNative:Firebase,
              public http: HttpClient) {
    console.log('Hello FcmProvider Provider');
  }

  // Get permission from the user
  async getToken() {
    let token;

    if (this.platform.is('android')) {
      token = await this.firebaseNative.getToken()
    }      
  }
  }
}

我收到错误

constructor(private platform: Platform, 
              public firebaseNative:Firebase,

这是说

找不到名字Firebase

我关注this article。

我安装了npm i @ ionic-native / firebase和npm i @ ionic-native / fcm包仍然没有得到它。有关更多信息，请参见截图

更新：请Package.Json

  "private": true,
  "dependencies": {
    "@angular/common": "^7.2.2",
    "@angular/core": "^7.2.2",
    "@angular/forms": "^7.2.2",
    "@angular/http": "^7.2.2",
    "@angular/platform-browser": "^7.2.2",
    "@angular/platform-browser-dynamic": "^7.2.2",
    "@angular/router": "^7.2.2",
    "@ionic-native/core": "^5.0.0",
    "@ionic-native/fcm": "^5.1.0",
    "@ionic-native/firebase": "^5.1.0",
    "@ionic-native/splash-screen": "^5.0.0",
    "@ionic-native/status-bar": "^5.0.0",
    "@ionic/angular": "^4.0.0",
    "angularfire2": "^5.1.1",
    "cordova-plugin-firebase": "2.0.5",
    "core-js": "^2.5.4",
    "firebase": "^5.8.3",
    "ionic-angular": "^3.1.0",
    "nvm-win": "^0.2.4",
    "reinstall": "^2.0.0",
    "rxjs": "~6.3.3",
    "zone.js": "~0.8.29"
  },
}

我该如何解决这个问题？

Answer 1

可能您正在使用离子版本3项目，并且您使用的是最新版本的离子V4。

第一解决方案

如v4文档中所述，在导入路径的最后使用“ngx”

喜欢：-

从'@ ionic-native / firebase / ngx'导入{Firebase}; REF：https://ionicframework.com/docs/native/firebase

二解决方案

首先删除现有的插件离子cordova插件删除cordova-plugin-firebase

重新添加

离子cordova插件添加cordova-plugin-firebase

npm install --save @ ionic-native / firebase @ 4

请记住遵循doc v3进一步实施

https://ionicframework.com/docs/v3/native/firebase/

Answer 2

由于您使用的Angular版本大于Angular 6，因此您需要在导入结束时包含/ngx。即import { Firebase } from '@ionic-native/firebase/ngx';

Answer 3

如果您为项目类型安装了错误的本机插件版本，或者在导入结束时没有附加ngx，则会出现此错误。

检查ionic.config.json中的项目类型

如果类型为“ionic-angular”（通常为Ionic 3），则安装4.x.x版本。

npm i -s @ionic-native/firebase@4

如果类型为“angular”（通常为Ionic 4），则安装最新版本

npm i -s @ionic-native/firebase

注意：

仅在使用Angular 6时才在导入结束时添加ngx

import { Firebase } from '@ionic-native/firebase/ngx';

如果不从导入中删除ngx

import { Firebase } from '@ionic-native/firebase'

Refencence：https://github.com/ionic-team/ionic/issues/15225#issuecomment-414074074