[Vue warn]: The setup binding property "formatSettingsExpand" is already declared.

[sumon-devxhub]

<script>
import { defineComponent, ref } from '@nuxtjs/composition-api'
export default defineComponent({
   setup() {
      const formatSettingsExpand = ref(false)
      return {
         formatSettingsExpand,
      }
   }
})
</script>

• I tried all of the solutions from this issue but they are not working - https://github.com/vuejs/composition-api/issues/213

[danielroe]

Would you provide a reproduction? 🙏

[cdwieber]

I know this is an old issue, but just in case someone comes along looking for an answer: in my case it's because I'm working while overtired and inattentive and at some point I installed @nuxt/composition-api on top of @vue/composition-api. Nuxt includes the second one as a dependency, no need to do that; it was loading twice, hence the error.

Long story short, in my case it was a PEBKAC... I guess check your package.json and make sure you include only one?

[rchl]

We will have to assume that the initial issue was the same because it doesn't reproduce here in a minimal setup.