✨Cache: Export NewInformer

Overwrting NewInformer may be useful for testing purposes and allows to
bring a custom Informer implementation.

pkg/cache/cache.go

@@ -239,8 +239,9 @@ type Options struct {
 	// If unset, this will fall through to the Default* settings.
 	ByObject map[client.Object]ByObject
 
-	// newInformer allows overriding of NewSharedIndexInformer for testing.
-	newInformer *func(toolscache.ListerWatcher, runtime.Object, time.Duration, toolscache.Indexers) toolscache.SharedIndexInformer
+	// NewInformer allows overriding of NewSharedIndexInformer, for example for testing
+	// or if someone wants to write their own Informer.
+	NewInformer *func(toolscache.ListerWatcher, runtime.Object, time.Duration, toolscache.Indexers) toolscache.SharedIndexInformer
 }
 
 // ByObject offers more fine-grained control over the cache's ListWatch by object.
@@ -432,7 +433,7 @@ func newCache(restConfig *rest.Config, opts Options) newCacheFunc {
 				WatchErrorHandler:     opts.DefaultWatchErrorHandler,
 				UnsafeDisableDeepCopy: ptr.Deref(config.UnsafeDisableDeepCopy, false),
 				EnableWatchBookmarks:  ptr.Deref(config.EnableWatchBookmarks, true),
-				NewInformer:           opts.newInformer,
+				NewInformer:           opts.NewInformer,
 			}),
 			readerFailOnMissingInformer: opts.ReaderFailOnMissingInformer,
 		}