我跟随this tutorial使用angularfire2将firebase应用于离子项目。我完全按照教程，直到我在运行
时收到错误$ ionic serve
完整的错误是这样的：
typescript: home/brian/node_modules/angularfire2/angularfire2.d.ts, line: 1
Cannot find module '@angular/core'.
L1: import { InjectionToken, NgZone } from '@angular/core';
L2: import { Observable, Subscription } from 'rxjs';
typescript: home/brian/node_modules/angularfire2/angularfire2.d.ts, line: 2
Cannot find module 'rxjs'.
L1: import { InjectionToken, NgZone } from '@angular/core';
L2: import { Observable, Subscription } from 'rxjs';
L3: import { FirebaseOptions, FirebaseAppConfig } from '@firebase/app-types';
typescript: home/brian/node_modules/angularfire2/auth/auth.d.ts, line: 3
Cannot find module '@angular/core'.
L2: import { FirebaseOptions, FirebaseAppConfig } from '@firebase/app-types';
L3: import { NgZone } from '@angular/core';
L4: import { Observable } from 'rxjs';
typescript: home/brian/node_modules/angularfire2/auth/auth.d.ts, line: 4
Cannot find module 'rxjs'.
L3: import { NgZone } from '@angular/core';
L4: import { Observable } from 'rxjs';
L5: export declare class AngularFireAuth {
typescript: home/brian/node_modules/angularfire2/firebase.app.module.d.ts, line: 1
Cannot find module '@angular/core'.
L1: import { InjectionToken } from '@angular/core';
L2: import { FirebaseApp as _FirebaseApp, FirebaseOptions, FirebaseAppConfig } from '@firebase/app-types';
追溯，当我通过命令行安装angularfire2时，我运行此命令（following the documentation）
npm install firebase angularfire2 --save
然后它返回：
npm WARN registry Unexpected warning for https://registry.npmjs.org/: Miscellaneous Warning EAI_AGAIN: request to https://registry.npmjs.org/firebase failed, reason: getaddrinfo EAI_AGAIN registry.npmjs.org registry.npmjs.org:443
npm WARN registry Using stale package data from https://registry.npmjs.org/ due to a request error during revalidation.
npm WARN angularfire2@5.0.0-rc.7 requires a peer of @angular/common@^5.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN angularfire2@5.0.0-rc.7 requires a peer of @angular/core@^5.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN angularfire2@5.0.0-rc.7 requires a peer of @angular/platform-browser@^5.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN angularfire2@5.0.0-rc.7 requires a peer of @angular/platform-browser-dynamic@^5.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN angularfire2@5.0.0-rc.7 requires a peer of @firebase/app@^0.1.6 but none is installed. You must install peer dependencies yourself.
npm WARN angularfire2@5.0.0-rc.7 requires a peer of rxjs@^5.5.4 but none is installed. You must install peer dependencies yourself.
npm WARN angularfire2@5.0.0-rc.7 requires a peer of zone.js@^0.8.0 but none is installed. You must install peer dependencies yourself.
npm WARN bin@1.0.0 No description
npm WARN bin@1.0.0 No repository field.
+ angularfire2@5.0.0-rc.7
+ firebase@5.0.2
updated 2 packages in 80.502s
然后我尝试再次运行相同的命令，现在它返回几乎与上面相同，但没有 npm WARN注册表。
npm WARN angularfire2@5.0.0-rc.8.0 requires a peer of @angular/common@^6.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN angularfire2@5.0.0-rc.8.0 requires a peer of @angular/core@^6.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN angularfire2@5.0.0-rc.8.0 requires a peer of @angular/platform-browser@^6.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN angularfire2@5.0.0-rc.8.0 requires a peer of @angular/platform-browser-dynamic@^6.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN angularfire2@5.0.0-rc.8.0 requires a peer of rxjs@^6.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN angularfire2@5.0.0-rc.8.0 requires a peer of zone.js@^0.8.0 but none is installed. You must install peer dependencies yourself.
npm WARN bin@1.0.0 No description
npm WARN bin@1.0.0 No repository field.
package.json 文件位于/ home / brian中，它包含以下行。
{
"name": "bin",
"version": "1.0.0",
"main": "index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"author": "",
"license": "ISC",
"description": "",
"dependencies": {
"angular": "^1.7.0",
"angularfire2": "^5.0.0-rc.8.0",
"cordova": "^8.0.0",
"firebase": "^5.0.2",
"ionic": "^3.20.0",
"npm": "^6.0.1"
}
}
运行$ ionic serve
后，浏览器中有此文本Ionic Framework: 3.9.2
Ionic App Scripts: 3.1.9
Angular Core: 5.2.10
Angular Compiler CLI: 5.2.10
Node: 10.0.0
OS Platform: Linux 4.4
Navigator Platform: Linux x86_64
User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:57.0) Gecko/20100101 Firefox/57.0
我想我在与npm和node相同的位置安装了angularfire， 因为我在默认位置运行所有这些安装命令 打开命令行时。它应该在/ home / brian中。我也有 这个文件夹/ home / brian / node_modules。
This similar thread说我们需要将@angular重命名为@ angular2，但我发现它返回相同的错误。
有没有人遇到同样的问题？任何帮助将不胜感激。
答案 0 :(得分：4)
根据您ionic v 3.9.2 的版本信息，您需要安装angular V4.4.6，请参阅离子 dependencies 。顺便说一句，如果您没有声明要安装的确切版本，npm将默认安装最新版本。
您可以使用以下命令：
// all angular packages listed in above dependencies
npm install @angular/[package-name]@4.4.6
根据角度套餐的版本，您应安装 **v5.0.0-rc.3的AngularFire2 v5.0.1+(not v6.x) **和rxjs
npm install firebase@4.5.0 angularfire2@5.0.0-rc.3 --save
npm install rxjs@5.0.1 --save
答案 1 :(得分：0)
感谢@Pengyy，您的建议非常接近修复它，只需再添加一步。
此错误是由我使用的非兼容版本引起的 - @ angular / core - firebase - angularfire2 - 和rxjs。
我解决它的方法是关注@Penggyy的回答：
在我的主文件夹/home/brian中运行
npm install @angular/[package-name]@4.4.6 npm install firebase@4.5.0 angularfire2@5.0.0-rc.3 --save npm install rxjs@5.0.1 --save 然后需要再做一步：在我运行离子服务的离子项目文件夹中，（例如项目名称为myApp，文件夹为/home/brian/myApp）运行此命令。
npm install firebase@4.5.0 最后一步是必要的，否则我仍然会收到错误
Runtime Error
Cannot find module "firebase/auth"
这个问题解决了！