···

       
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544
       
 
       


     

       
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545
       
 
       
However, we're able to pass additional variables to our mutation, e.g. `{ extra }`, and since

     

       
546
       
546
       
 
       
`$extra` isn't defined it will be filtered once the mutation is sent to the API. An optimistic

     

       
547
       
547
       
-
       
mutation however will still be able to access this variable.

     

       
547
       
547
       
+
       
mutation however will still be able to access this variable, like so:

     

       
548
       
548
       
+
       


     

       
549
       
549
       
+
       
```js

     

       
550
       
550
       
+
       
cacheExchange({

     

       
551
       
551
       
+
       
  updates: {

     

       
552
       
552
       
+
       
    Mutation: {

     

       
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553
       
+
       
      updateTodo(_result, _args, _cache, info) {

     

       
554
       
554
       
+
       
        const extraVariable = info.variables.extra;

     

       
555
       
555
       
+
       
      },

     

       
556
       
556
       
+
       
    },

     

       
557
       
557
       
+
       
  },

     

       
558
       
558
       
+
       
});

     

       
559
       
559
       
+
       
```

     

       
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560
       
 
       


     

       
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### Reading on

     

       
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