fix(types): fix storeToRefs state return type (#2574)

packages/pinia/src/storeToRefs.ts

@@ -11,21 +11,46 @@ import {
   toRefs,
 } from 'vue-demi'
 import { StoreGetters, StoreState } from './store'
-import type { PiniaCustomStateProperties, StoreGeneric } from './types'
+import type {
+  _ActionsTree,
+  _GettersTree,
+  _UnwrapAll,
+  PiniaCustomStateProperties,
+  StateTree,
+  Store,
+  StoreGeneric,
+} from './types'
 
 type ToComputedRefs<T> = {
   [K in keyof T]: ToRef<T[K]> extends Ref<infer U>
     ? ComputedRef<U>
     : ToRef<T[K]>
 }
 
+/**
+ * Extracts the refs of a state object from a store. If the state value is a Ref or type that extends ref, it will be kept as is.
+ * Otherwise, it will be converted into a Ref.
+ */
+declare type ToStateRefs<SS> =
+  SS extends Store<
+    string,
+    infer UnwrappedState,
+    _GettersTree<StateTree>,
+    _ActionsTree
+  >
+    ? UnwrappedState extends _UnwrapAll<Pick<infer State, infer Key>>
+      ? {
+          [K in Key]: ToRef<State[K]>
+        }
+      : ToRefs<UnwrappedState>
+    : ToRefs<StoreState<SS>>
+
 /**
  * Extracts the return type for `storeToRefs`.
  * Will convert any `getters` into `ComputedRef`.
  */
-export type StoreToRefs<SS extends StoreGeneric> = ToRefs<
-  StoreState<SS> & PiniaCustomStateProperties<StoreState<SS>>
-> &
+export type StoreToRefs<SS extends StoreGeneric> = ToStateRefs<SS> &
+  ToRefs<PiniaCustomStateProperties<StoreState<SS>>> &
   ToComputedRefs<StoreGetters<SS>>
 
 /**

packages/pinia/test-dts/customizations.test-d.ts

@@ -121,13 +121,16 @@ expectType<{
 pinia.use(({ options, store }) => {
   const { debounce: debounceOptions } = options
   if (debounceOptions) {
-    return Object.keys(debounceOptions).reduce((debouncedActions, action) => {
-      debouncedActions[action] = debounce(
-        store[action],
-        debounceOptions[action]
-      )
-      return debouncedActions
-    }, {} as Record<string, (...args: any[]) => any>)
+    return Object.keys(debounceOptions).reduce(
+      (debouncedActions, action) => {
+        debouncedActions[action] = debounce(
+          store[action],
+          debounceOptions[action]
+        )
+        return debouncedActions
+      },
+      {} as Record<string, (...args: any[]) => any>
+    )
   }
 })
 
@@ -185,8 +188,106 @@ expectType<{
       const double = computed(() => n.value * 2)
       return {
         n,
-        double
+        double,
+      }
+    })()
+  )
+)
+
+expectType<{
+  n: Ref<number>
+  customN: Ref<number> & { plusOne: () => void }
+  double: ComputedRef<number>
+  myState: Ref<number>
+  stateOnly: Ref<number>
+}>(
+  storeToRefs(
+    defineStore('a', () => {
+      const n = ref(1)
+      const customN = ref(1) as Ref<number> & { plusOne: () => void }
+      const double = computed(() => n.value * 2)
+      return {
+        n,
+        customN,
+        double,
+      }
+    })()
+  )
+)
+
+expectType<{
+  n: Ref<number>
+  customN: Ref<number> & { plusOne: () => void }
+  double: ComputedRef<number>
+  myState: Ref<number>
+  stateOnly: Ref<number>
+}>(
+  storeToRefs(
+    defineStore('a', () => {
+      const n = ref(1)
+      const customN = ref(1) as Ref<number> & { plusOne: () => void }
+      const double = computed(() => n.value * 2)
+
+      function plusOne() {
+        customN.value++
+      }
+
+      return {
+        n,
+        customN,
+        double,
+        plusOne,
       }
     })()
   )
 )
+
+expectType<{
+  n: Ref<number>
+  customN: Ref<number> & { plusOne: () => void }
+  double: ComputedRef<number>
+  myState: Ref<number>
+  stateOnly: Ref<number>
+}>(
+  storeToRefs(
+    defineStore('a', {
+      state: () => ({
+        n: 1,
+        customN: ref(1) as Ref<number> & { plusOne: () => void },
+      }),
+      getters: {
+        double: (state) => state.n * 2,
+      },
+      actions: {
+        plusOne() {
+          this.n++
+        },
+      },
+    })()
+  )
+)
+
+expectType<{
+  n: Ref<number>
+  customN: Ref<number> & { plusOne: () => void }
+  double: ComputedRef<number>
+  myState: Ref<number>
+  stateOnly: Ref<number>
+}>(
+  storeToRefs(
+    defineStore('a', {
+      state: () => ({
+        n: 1,
+        customN: ref(1) as Ref<number> & { plusOne: () => void },
+      }),
+      getters: {
+        double: (state) => state.n * 2,
+      },
+      actions: {
+        plusOne() {
+          this.n++
+        },
+      },
+    })()
+  )
+)