Woah, npm 7 automatically installs peer dependencies:...
Woah, npm 7 automatically installs peer dependencies: https://github.blog/2020-10-13-presenting-v7-0-0-of-the-npm-cli/
This will bite people.
Example: If a package specifies React 16 as a peerDependency, it won't install if you're using React 17!
Workaround: disable auto install via this flag:
--legacy-peer-deps 😎
Takeaway: If you're maintaining an npm package, avoid declaring restrictive peerDependencies versions. If you specify a specific max version, you need to immediately update your peerDependencies when new major versions are released. Otherwise, your consumers will get an error.