fix(runtime-core): extra fixes for when V is unknown

Author: pfumagalli

packages/dts-test/setupHelpers.test-d.ts

@@ -200,20 +200,19 @@ describe('defineProps w/ generics and runtime declarations', () => {
       foo: {
         type: Object as PropType<T>,
         required: false,
-        default: null,
+        default: null
       },
       bar: {
         type: Object as PropType<T>,
-        required: true,
-      },
+        required: true
+      }
     })
     expectType<T | null>(props.foo)
     expectType<T>(props.bar)
   }
   test()
 })
 
-
 describe('defineEmits w/ type declaration', () => {
   const emit = defineEmits<(e: 'change') => void>()
   emit('change')

packages/runtime-core/src/componentProps.ts

@@ -125,12 +125,14 @@ type InferPropType<T> = [T] extends [null]
             : [T] extends [PropOptions<infer V, infer D>]
               ? unknown extends D
                 ? V
-                : V | D
-            : [T] extends [Prop<infer V, infer D>]
-              ? unknown extends V
-                ? IfAny<V, V, D>
-                : V
-              : T
+                : unknown extends V
+                  ? IfAny<V, V, D>
+                  : V
+              : [T] extends [Prop<infer V, infer D>]
+                ? unknown extends V
+                  ? IfAny<V, V, D>
+                  : V
+                : T
 
 /**
  * Extract prop types from a runtime props options object.