WIP Got garbage-collecting selector results working

Author: markerikson

test/test_selector.ts

@@ -1359,13 +1359,20 @@ describe('More perf comparisons', () => {
     console.log('cwCounters2.recomputations()', cwCounters2.recomputations())
   })
 
-  test('Does something?', async () => {
+  test.only('Does something?', async () => {
     const fn = vi.fn()
+
+    let resolve: () => void
+    const promise = new Promise<void>(r => (resolve = r))
+
     const registry = new FinalizationRegistry(heldValue => {
+      resolve()
       console.log('Garbage-collected value for ID: ', heldValue)
       fn(heldValue)
     })
 
+    const createSelectorWeakmap = createSelectorCreator(weakMapMemoize)
+
     const store = configureStore({
       reducer: {
         counter: counterSlice.reducer,
@@ -1380,24 +1387,57 @@ describe('More perf comparisons', () => {
 
     const reduxStates: RootState[] = []
 
-    for (let i = 0; i < 10; i++) {
-      store.dispatch(counterSlice.actions.increment2())
+    const NUM_ITEMS = 10
+
+    for (let i = 0; i < NUM_ITEMS; i++) {
+      store.dispatch(todosSlice.actions.toggleCompleted(1))
       const state = store.getState()
       reduxStates.push(state)
       registry.register(state, i)
     }
 
+    const cdTodoIdsAndNames = createSelectorWeakmap(
+      (state: RootState) => state.todos,
+      todos => {
+        // console.log('Recalculating todo IDs')
+        return todos.map(todo => ({ id: todo.id, name: todo.name }))
+      }
+    )
+
+    for (const state of reduxStates) {
+      cdTodoIdsAndNames(state)
+    }
+
+    expect(cdTodoIdsAndNames.recomputations()).toBe(NUM_ITEMS)
+
+    for (const state of reduxStates) {
+      cdTodoIdsAndNames(state)
+    }
+
+    expect(cdTodoIdsAndNames.recomputations()).toBe(NUM_ITEMS)
+
+    console.log('clearCache: ', cdTodoIdsAndNames.clearCache)
+    cdTodoIdsAndNames.memoizedResultFunc.clearCache()
+
+    cdTodoIdsAndNames(reduxStates[0])
+
+    expect(cdTodoIdsAndNames.recomputations()).toBe(NUM_ITEMS + 1)
+
+    cdTodoIdsAndNames(reduxStates[1])
+
+    expect(cdTodoIdsAndNames.recomputations()).toBe(NUM_ITEMS + 2)
+
     console.log('Before nulling out')
     // @ts-ignore
-    reduxStates[3] = null
+    reduxStates[0] = null
     console.log('After nulling out')
     if (global.gc) {
       global.gc()
     }
     console.log('After GC')
 
-    await new Promise(resolve => setTimeout(resolve, 0))
-    expect(fn).toHaveBeenCalledWith(3)
+    await promise
+    expect(fn).toHaveBeenCalledWith(0)
 
     // garbage-collected for ID: 3
   })