update

packages/reactivity/__tests__/computed.spec.ts

@@ -33,6 +33,20 @@ describe('reactivity/computed', () => {
     expect(cValue.value).toBe(1)
   })
 
+  it('pass oldValue to computed getter', () => {
+    const count = ref(0)
+    const oldValue = ref()
+    const curValue = computed(pre => {
+      oldValue.value = pre
+      return count.value
+    })
+    expect(curValue.value).toBe(0)
+    expect(oldValue.value).toBe(undefined)
+    count.value++
+    expect(curValue.value).toBe(1)
+    expect(oldValue.value).toBe(0)
+  })
+
   it('should compute lazily', () => {
     const value = reactive<{ foo?: number }>({})
     const getter = vi.fn(() => value.foo)

packages/reactivity/src/effect.ts

@@ -381,7 +381,7 @@ export function refreshComputed(computed: ComputedRefImpl): false | undefined {
 
   try {
     prepareDeps(computed)
-    const value = computed.fn()
+    const value = computed.fn(computed._value)
     if (dep.version === 0 || hasChanged(value, computed._value)) {
       computed._value = value
       dep.version++

packages/runtime-core/src/scheduler.ts

@@ -1,5 +1,5 @@
 import { ErrorCodes, callWithErrorHandling, handleError } from './errorHandling'
-import { type Awaited, NOOP, isArray } from '@vue/shared'
+import { NOOP, isArray } from '@vue/shared'
 import { type ComponentInternalInstance, getComponentName } from './component'
 
 export enum SchedulerJobFlags {

packages/shared/src/typeUtils.ts

@@ -13,15 +13,6 @@ export type LooseRequired<T> = { [P in keyof (T & Required<T>)]: T[P] }
 // https://stackoverflow.com/questions/49927523/disallow-call-with-any/49928360#49928360
 export type IfAny<T, Y, N> = 0 extends 1 & T ? Y : N
 
-// To prevent users with TypeScript versions lower than 4.5 from encountering unsupported Awaited<T> type, a copy has been made here.
-export type Awaited<T> = T extends null | undefined
-  ? T // special case for `null | undefined` when not in `--strictNullChecks` mode
-  : T extends object & { then(onfulfilled: infer F, ...args: infer _): any } // `await` only unwraps object types with a callable `then`. Non-object types are not unwrapped
-    ? F extends (value: infer V, ...args: infer _) => any // if the argument to `then` is callable, extracts the first argument
-      ? Awaited<V> // recursively unwrap the value
-      : never // the argument to `then` was not callable
-    : T // non-object or non-thenable
-
 /**
  * Utility for extracting the parameters from a function overload (for typed emits)
  * https://github.com/microsoft/TypeScript/issues/32164#issuecomment-1146737709