I am not sure what is happening. From want I understand:

• VueUse does not directly import vue, while vue-demi has vue as peerDeps
• You already have vue in your package.json

In which vue is already satisfied. I don't know why yarn emits this error

Parent packages need to declare the non-optional peer dependencies of packages in their dependencies as peer or optional peer dependencies. It would be optional peer dependencies with */any version for @vueuse/* as they do not import vue

https://yarnpkg.com/advanced/error-codes#yn0002---missing_peer_dependency

I.e for each @vueuse/* package that depends on vue-demi, they need these lines (excluding the composition package as its optional in vue-demi): 1b258ac#diff-0b810c38f3c138a3d5e44854edefd5eb966617ca84e62f06511f60acc40546c7L41-L48

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Bump

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Issue still active

also related to #1912.

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Not stale

According to vue-demi's README, plugins/libraries using vue-demi need to also provide the peerDependencies for the versions of vue and @vue/composition-api they want to support:

https://github.com/vueuse/vue-demi#usage

That would be the recommended fix for this issue.

Otherwise, for now, users of vueuse can provide packageExtensions in the .yarnrc.yml to address the warning coming from yarn, with something such as the following (which mimics the required fix anyway):

packageExtensions:
  #"@vueuse/<package>@<version>:
  #e.g.:
  "@vueuse/core@10.4.1":
    peerDependencies:
      vue: ^3.0.0-0 || ^2.6.0

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

Still relevant

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Not stale

I'm using @vueuse/core and I had to fix the missing peerDependencies in multiple @vueuse packages because @vueuse/core depends on @vueuse/shared which also has a dependency to vue-demi.

Here are my changes to .yarnrc.yaml to whom it may concern:

packageExtensions:
  "@vueuse/core@*":
    peerDependencies:
      vue: ^3.0.0-0 || ^2.6.0
  "@vueuse/shared@*":
    peerDependencies:
      vue: ^3.0.0-0 || ^2.6.0

@antfu is this still relevant with v12?

Since vue-demi has been removed in #4349, I think the issue has been resolved.