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src/utils/useCurrentInstance.ts

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+import { getCurrentInstance } from 'vue'
+import type { ComponentInternalInstance } from 'vue'
+
+export default function useCurrentInstance() {
+    if (!getCurrentInstance()) {
+        throw new Error('useCurrentInstance() can only be used inside setup() or functional components!')
+    }
+    const { appContext } = getCurrentInstance() as ComponentInternalInstance
+    const proxy = appContext.config.globalProperties
+    return {
+        proxy,
+    }
+}