Add default implementation of ApolloCache#gc (#5974)

* Add default implementation of ApolloCache#gc Addresses #5966 * Changelog update Co-authored-by: Hugh Willson <hugh@octonary.com>
apollographql · Feb 21, 2020 · d42c280 · d42c280
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -125,6 +125,9 @@
 - Expose cache `modify` and `identify` to the mutate `update` function.  <br/>
   [@hwillson](https://github.com/hwillson) in [#5956](https://github.com/apollographql/apollo-client/pull/5956)
 
+- Add a default `gc` implementation to `ApolloCache`.  <br/>
+  [@justinwaite](https://github.com/justinwaite) in [#5974](https://github.com/apollographql/apollo-client/pull/5974)
+
 ### Bug Fixes
 
 - `useMutation` adjustments to help avoid an infinite loop / too many renders issue, caused by unintentionally modifying the `useState` based mutation result directly.  <br/>

diff --git a/src/cache/core/cache.ts b/src/cache/core/cache.ts
@@ -95,6 +95,10 @@ export abstract class ApolloCache<TSerialized> implements DataProxy {
   ): boolean {
     return false;
   }
+
+  public gc(): string[] {
+    return [];
+  }
 
   // Experimental API