types: mixin and extends typing on data and setup (#2404)

close #2350

test-dts/defineComponent.test-d.tsx

@@ -445,10 +445,18 @@ describe('with mixins', () => {
   const MixinD = defineComponent({
     mixins: [MixinA],
     data() {
+      //@ts-expect-error computed are not available on data()
+      expectError<number>(this.dC1)
+      //@ts-expect-error computed are not available on data()
+      expectError<string>(this.dC2)
+
       return {
         d: 4
       }
     },
+    setup(props) {
+      expectType<string>(props.aP1)
+    },
     computed: {
       dC1(): number {
         return this.d + this.a
@@ -467,6 +475,34 @@ describe('with mixins', () => {
         required: true
       }
     },
+
+    data(vm) {
+      expectType<number>(vm.a)
+      expectType<number>(vm.b)
+      expectType<number>(vm.c)
+      expectType<number>(vm.d)
+
+      // should also expose declared props on `this`
+      expectType<number>(this.a)
+      expectType<string>(this.aP1)
+      expectType<boolean | undefined>(this.aP2)
+      expectType<number>(this.b)
+      expectType<any>(this.bP1)
+      expectType<number>(this.c)
+      expectType<number>(this.d)
+
+      return {}
+    },
+
+    setup(props) {
+      expectType<string>(props.z)
+      // props
+      expectType<string>(props.aP1)
+      expectType<boolean | undefined>(props.aP2)
+      expectType<any>(props.bP1)
+      expectType<any>(props.bP2)
+      expectType<string>(props.z)
+    },
     render() {
       const props = this.$props
       // props