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

Resolving version conflicts

In the case of version clashes after a package update, remove node_modules and the package-lock.json file. Then, reinstall all packages. It's a decent workout as well:

// hits the gym
rm -rf node_modules package-lock.json

// post-workout protein shake
npm install


To avoid the same gym and shake routine, review and align the package versions in your package.json before reinstalling.

Power to the developer

Take charge and manage your peer dependencies directly in your package.json. This proactive step ensures you know exactly what's going on in your project. Use npm info to check the peer dependencies of a new package:

// look before you leap
npm info [package] peerDependencies


Debugging import troubles

Import issues can occur, often linked to stylesheets or modules from packages like @angular/cdk or @angular/material. Your detective process should be:

1. Examine the import paths.
2. Check the package versions in your project.
3. If the issues persist—send in the cavalry! That means reinstall the peer dependencies.

This detective work ensures the right and harmonious paths and configurations in your project.

Batch installation to save time

In case of multiple peer dependencies to install, consider scripting the process. Write a shell script to read the peer dependencies and run npm install --save for each. Existing npm utilities can automate this process but be aware that some of these might be a relic of the past.

Keeping up with the times

Keeping up-to-date with tools is essential. Regularly updating npm ensures that you won't miss the latest features and fixes. Update with:

// because new is almost always better
npm install -g npm@latest


Once you've updated your dependencies or npm itself, remember to give your project a fresh start—npm start your journey once more.

Organized troubleshooting approach

When walking through the debris of peer dependency warnings, here are some steps to take:

1. Understand the error message — identify missing peers.
2. Seek out these required peers and confirm compatible versions.
3. Then hold your hammer high and install the missing peers.

Stay organized, save time and keep calm!