add proxy example to context boilerplate

Cards/dev/Create Context Boilerplate.md

@@ -72,3 +72,26 @@ const useMyContext = () => useContext(MyContext)
 ```
 
 Which will allow you to **[destructure](https://www.geeksforgeeks.org/destructuring-of-props-in-reactjs/#:~:text=What%20is%20Destructuring%3F,variables%20created%20by%20the%20developer.)** your values: `const {someValue} = useMyContext()`
+
+---
+
+### Bonus
+If you try to use the `useContext` hook outside of the context provider, React will just be like: "eh.. lgtm!"
+
+You probably dont want that. A cool thing you can do is add a `Proxy` object as an argument to your `createContext` call
+instead of an empty object.
+
+Here's an example:
+
+```tsx
+const MyContext = createContext(
+  new Proxy(
+    {},
+    {
+      get(){
+        throw new Error("useMyContext must be used from inside Provider")
+      }
+    }
+  )
+)
+```