npm WARN … requires a peer of … but none is installed. You must install peer dependencies yourself

Question

I tried to run a project downloaded from github. Unfortunately, during npm install the following warnings were shown. I tried to change the version based on thi

Answer 1

You need to only depend on one major version of angular, so update all modules depending on angular 2.x :

• update @angular/flex-layout to ^2.0.0-beta.9
• update @angular/material to ^2.0.0-beta.12
• update angularfire2 to ^4.0.0-rc.2
• update zone.js to ^0.8.18
• update webpack to ^3.8.1
• add @angular/cdk@2.0.0-beta.12 (required for @angular/material)
• replace angular2-google-maps by @agm/core@1.0.0-beta.1 (new name)

Answer 2

The accepted answer of using npm-install-peers did not work, nor removing node_modules and rebuilding. The answer to run

npm install --save-dev @xxxxx/xxxxx@latest

for each one, with the xxxxx referring to the exact text in the peer warning, worked. I only had four warnings, if I had a dozen or more as in the question, it might be a good idea to script the commands.

Answer 3

I had a similar issue and solved after running these instructions!

npm install npm -g
npm install --save-dev @angular/cli@latest
npm install
npm start

Answer 4

npm i -D @angular/material @angular/cdk @angular/animations