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I've just cloned a repo, which recommends the use of Yarn to install dependencies. When I run yarn install, it seems to be okay, but it provides this warning:
yarn install v0.20.3 [1/4] 🔍 Resolving packages... [2/4] 🚚 Fetching packages... [3/4] 🔗 Linking dependencies... warning "[email protected]" has incorrect peer dependency "node-sass@^3.4.2". [4/4] 📃 Building fresh packages... ✨ Done in 77.59s. I've looked online to find out exactly what "has incorrect peer dependency" means. But all I can find are reported issues on other repositories or questions about how to fix the problem.
Can someone explain what this means and why it is only a warning, and not an error?
Also, is it something that I should try to address or report to the community behind the repo I have just cloned?
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Having a peer dependency means that your package needs a dependency that is the same exact dependency as the person installing your package. This is useful for packages like react that need to have a single copy of react-dom that is also used by the person installing it.
Run npm install (or yarn install ) to install prod and dev , as well as peer dependencies. You still may see "unmet peer dependency" warnings, due to installation flow of npm/yarn. Also it won't update lock (shrinkwrap) files or modify package. json, keeping your setup pure and clean.
Solution 1: Ignore the peerDependencies The easiest way to fix the issue is to pass an additional parameter –legacy-peer-deps to npm install. The --legacy-peer-deps tells the npm to ignore the peer dependencies and continue the installation of the package.
Running yarn install --check-files or just yarn install can fix the issue and install the missing depecendencies. Explicitly adding to your package. json may also be an option.
It is only a warning as it won't actually stop your code from running, It's just there to give you a heads up that there's something wrong with your dependencies.
Effectively, peer dependencies are a way for packages to specify, "to use me, you should also have x version of y package installed".
You should upgrade to the latest versions, see this link for more details on sass-loader dependencies
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