fix(data): immutably delete an entity (#3040)

Closes #2553

Author: donohoea

modules/data/spec/reducers/entity-change-tracker-base.spec.ts

@@ -580,6 +580,22 @@ describe('EntityChangeTrackerBase', () => {
       const collection = tracker.trackDeleteMany(['1234', 456], origCollection);
       expect(collection).toBe(origCollection);
     });
+
+    it('should not mutate changeState when called on a tracked "updated" entity', () => {
+      const existingEntity = getFirstExistingEntity();
+      const updatedEntity = toUpdate({
+        ...existingEntity,
+        name: 'test update',
+      });
+      const collection = tracker.trackUpdateOne(updatedEntity, origCollection);
+      const change = collection.changeState[existingEntity!.id];
+      expect(change).toBeDefined();
+      expectChangeType(change, ChangeType.Updated);
+      Object.freeze(change);
+      expect(() => {
+        tracker.trackDeleteMany([existingEntity!.id], collection);
+      }).not.toThrowError();
+    });
   });
 
   describe('#trackUpdateOne', () => {

modules/data/src/reducers/entity-change-tracker-base.ts

@@ -454,7 +454,7 @@ export class EntityChangeTrackerBase<T> implements EntityChangeTracker<T> {
           } else if (trackedChange.changeType === ChangeType.Updated) {
             // Special case: switch change type from Updated to Deleted.
             cloneChgStateOnce();
-            trackedChange.changeType = ChangeType.Deleted;
+            chgState[id] = { ...chgState[id], changeType: ChangeType.Deleted };
           }
         } else {
           // Start tracking this entity

modules/store/spec/runtime_checks.spec.ts

@@ -138,15 +138,6 @@ describe('Runtime checks:', () => {
         flush();
       }).not.toThrow();
     }));
-
-    it('should not throw for NgRx actions', fakeAsync(() => {
-      const store = setupStore({ strictStateSerializability: true });
-
-      expect(() => {
-        store.dispatch(makeNgrxAction(invalidAction()));
-        flush();
-      }).not.toThrow();
-    }));
   });
 
   describe('Action Serialization:', () => {
@@ -172,6 +163,15 @@ describe('Runtime checks:', () => {
         flush();
       }).not.toThrow();
     }));
+
+    it('should not throw for NgRx actions', fakeAsync(() => {
+      const store = setupStore({ strictActionSerializability: true });
+
+      expect(() => {
+        store.dispatch(makeNgrxAction(invalidAction()));
+        flush();
+      }).not.toThrow();
+    }));
   });
 
   describe('State Mutations', () => {
@@ -338,19 +338,31 @@ function reducerWithBugs(state: any = {}, action: any) {
         invalidSerializationState: true,
         invalid: new Date(),
       };
-
+      
     case ErrorTypes.UnserializableAction: {
       return {
         invalidSerializationAction: true,
       };
     }
+    
+    case '@ngrx ' + ErrorTypes.UnserializableAction: {
+      return {
+        invalidSerializationAction: true,
+      };
+    }
 
     case ErrorTypes.MutateAction: {
       action.foo = 'foo';
       return {
         invalidMutationAction: true,
       };
     }
+    case '@ngrx ' + ErrorTypes.MutateAction: {
+      action.foo = 'foo';
+      return {
+        invalidMutationAction: true,
+      };
+    }
 
     case ErrorTypes.MutateState: {
       state.invalidMutationState = true;