Module not found: Error: Can't resolve 'angularfire2' in '..' -- Angular 4

[luuksuijkerbuijk]

I saw more people with this problem in the Issues, but I wasn't able to resolve my problem with that informatie.

When I run ng serve I get the follow error:

ERROR in ./src/app/app.component.ts
Module not found: Error: Can't resolve 'angularfire2' in '......'

I am using angular 4

My package.json looks like this:

{
"name": "xxxxxxx",
"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/animations": "^4.0.1",
"@angular/common": "^4.0.1",
"@angular/compiler": "^4.0.1",
"@angular/compiler-cli": "^4.0.1",
"@angular/core": "^4.0.1",
"@angular/forms": "^4.0.1",
"@angular/http": "^4.0.1",
"@angular/platform-browser": "^4.0.1",
"@angular/platform-browser-dynamic": "^4.0.1",
"@angular/platform-server": "^4.0.1",
"@angular/router": "^4.0.1",
"core-js": "^2.4.1",
"rxjs": "^5.1.0",
"typescript": "^2.2.2",
"zone.js": "^0.8.4"
},
"devDependencies": {
"@angular/cli": "1.0.0",
"@angular/compiler-cli": "^4.0.0",
"@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": "~4.5.0",
"typescript": "~2.2.0"
}
}

Can anyone help me?

[luuksuijkerbuijk]

I think is was because Firebase itself wasn't installed right.
This did it for me:

npm install firebase angularfire2 --save

[danwguy]

Is there a solution for this??
I can do 'ionic cordova build browser' perfectly fine, it works great. However, every single time I do 'ionic cordova build browser --prod' I get a ton of errors and they all have

"Module not found: Error: Can't resolve '../../../angularfire2/database'"

I have done ionic cordova platform rm browser, then ionic cordova platform add browser. I have done npm install firebase angularfire2 --save, and still, it will only build normal, every time I try to build -prod I get can't resolve '../../../angularfire2/database' and "Field 'browser' doesn't contain a valid alias configuration" Please help, I need to build this project. I will be more than happy to give my package.json and my app.module.ts file if it will help. Thank you.

[andr3medeiros]

@danwguy downgrade to angularfire2@4.0.0-rc.1 worked for me on mac

[rastographics]

same thing as @andr3medeiros said...i could ionic serve and ionic build, but ionic build --prod would fail, thinking that angular2/database was a relative reference to a module, instead of looking in the node_modules folder.

downgrading to angularfire2@4.0.0-rc.1 solved it for me too.
on windows

[BAWES]

Downgrading to angularfire2@4.0.0-rc.1 did it for me. Thanks @andr3medeiros !

[Hailong]

Downgrading to angularfire2@4.0.0-rc.1 works for me too, I'm on Mac.

[alltej]

I am having this issue. Downgrading to angularfire2@4.0.0-rc.1 did not help.

[alltej]

I have to do a clean install of the dependencies, remove angularfire2 and install angularfire2@4.0.0-rc.1. That seems to work. Here are the steps:

1. delete node_modules folder

2. in package.json file, delete angularfire2 in dependencies

3. npm install

4. npm install --save angularfire2@4.0.0-rc.1

5. ionic cordova build android --prod

[CarlosAmaral]

Why is the issue closed though? Any hopes to get this working without having to downgrade?
Thank you!

[RalfViellieber]

Thanks alltej, same problem, same solution :-)
But still having to downgrade in 2018?!

[MrDrProfX]

Same problem.

[bobbycv64]

I know this is about Angular 4, here's the Angular 6 update:

npm install --save firebase angularfire2

angularfire2@5.1.0: AngularFire has moved, we're now @angular/fire

import { AngularFireModule } from '@angular/fire';
import { AngularFireDatabaseModule } from 'angularfire2/database';

[muhammadumerfarooq]

npm install -S angularfire2@latest

just run this command, then you will be able to find to angularfire2/firestore