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src/components/layouts/sideblock/sideblock.context.ts

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+import type { InjectionKey } from 'vue'
+import type { SideblockLayoutContext } from './sideblock.types'
+
+export const injectionKey = Symbol('sideblock-layout') as InjectionKey<SideblockLayoutContext>
+
+export function useSideblockLayoutContext() {
+  const context = inject(injectionKey)
+
+  if (!context) {
+    throw new Error('useSideblockLayoutContext() is called outside of <SideblockLayout> tree.')
+  }
+
+  return context
+}