fix(types/tsx): make JSX.Element extend VNode (#3171)

test-dts/functionalComponent.test-d.tsx

@@ -1,4 +1,6 @@
 import {
+  h,
+  Text,
   FunctionalComponent,
   expectError,
   expectType,
@@ -6,7 +8,7 @@ import {
 } from './index'
 
 // simple function signature
-const Foo = (props: { foo: number }) => props.foo
+const Foo = (props: { foo: number }) => h(Text, null, props.foo)
 
 // TSX
 expectType<JSX.Element>(<Foo foo={1} />)

test-dts/tsx.test-d.tsx

@@ -5,9 +5,11 @@ import {
   Fragment,
   Teleport,
   expectError,
-  expectType
+  expectType,
+  VNode
 } from './index'
 
+expectType<VNode>(<div />)
 expectType<JSX.Element>(<div />)
 expectType<JSX.Element>(<div id="foo" />)
 expectType<JSX.Element>(<input value="foo" />)