···

       
87
       
87
       
 
       
## Tracking unused fields

     

       
88
       
88
       
 
       


     

       
89
       
89
       
 
       
Currently the tracking unused fields feature has a few caveats with regards to tracking, first and foremost

     

       
90
       
90
       
-
       
it will only track in the same file to encourage [fragment co-location](https://www.apollographql.com/docs/react/data/fragments/#colocating-fragments).

     

       
91
       
91
       
-
       
Secondly it supports a few patterns which we'll add to as time progresses:

     

       
92
       
92
       
-
       


     

       
93
       
93
       
-
       
```ts

     

       
94
       
94
       
-
       
// Supported cases:

     

       
95
       
95
       
-
       
const result = (await client.query()) || useFragment();

     

       
96
       
96
       
-
       
const [result] = useQuery(); // --> urql

     

       
97
       
97
       
-
       
const { data } = useQuery(); // --> Apollo

     

       
98
       
98
       
-
       
const { field } = useFragment();

     

       
99
       
99
       
-
       
const [{ data }] = useQuery();

     

       
100
       
100
       
-
       
const {

     

       
101
       
101
       
-
       
  data: { pokemon },

     

       
102
       
102
       
-
       
} = useQuery();

     

       
103
       
103
       
-
       
```

     

       
90
       
90
       
+
       
it will only track the result and the accessed properties in the same file to encourage

     

       
91
       
91
       
+
       
[fragment co-location](https://www.apollographql.com/docs/react/data/fragments/#colocating-fragments).

     

       
104
       
92
       
 
       


     

       
105
       
105
       
-
       
Lastly we don't track mutations/subscriptions as some folks will add additional fields to properly support

     

       
93
       
93
       
+
       
Secondly, we don't track mutations/subscriptions as some folks will add additional fields to properly support

     

       
106
       
94
       
 
       
normalised cache updates.

     

       
107
       
95
       
 
       


     

       
108
       
96
       
 
       
## Fragment masking