"angularfire2@5.0.0-rc.4 requires a peer of ... but none is installed" error, tried modifying package.json with angular/core@^5.5.0 but no matching version found

[MaryCooperGD]

Firebase: ^4.5.0

AngularFire: ^5.0.0-rc.4

I'm gonna explain straight the problem 'cause it is a bit complicated with the pattern ...
I've cloned an Ionic project from github, then run ionic serve and installed the missing modules. The problem came up with the installation of angulafire2, using npm npm install angularfire2 . It tells me this:

and if I run ionic serve the error page comes up saying that it can't find the module @firebase/app even if it was installed. So I've tried following what the warning told me, and changed the versions of angular/common, angular/core etc to ^5.0.0 as requested by angularfire2, then run npm install, but an error shows up:

I'm really stuck into this problem and can't go on, how do I resolve this?

[davideast]

What is your Angular version?

[MaryCooperGD]

4.4.3

[davideast]

Change your package.json entry to "@angular/core": "^5.0.0".

[MaryCooperGD]

As I said in the question, that is what I tried, but just to the get the error saying " no matching version found for angular/core^5.5.0". The original version was in fact 4.4.3, but if I change to 5.5.0 give the not found error.

[davideast]

Right. Don't use ^5.5.0, use ^5.0.0.

[MaryCooperGD]

Same error :( keeps telling me that it needs ^5.0.0 even if it is 5.0.0

[EdricChan03]

@MaryCooperGD Can you try running npm ls @angular/core?

[awsaunier]

I am having the same problem as above. New app created with the latest angular cli (1.6.6). I also ran npm ls @angular/core' and it returned: -- @angular/core@5.2.2

Here is my install log: 2018-01-28T03_44_51_312Z-debug.log

[awsaunier]

This is no longer a problem for me. The npm instructions gave me errors but I installed it a different way with npm and then there were no errors.