fix(types): augment ref unwrap bail types in appropriate packages

Packages can now augment the ref unwrap bail types in their own `d.ts`.
Also updated the build script to auto concat any files in a package's
`types` directory to the final generated `d.ts`.

- `@vue/reactivity` should no longer require `libs: ["DOM"]` in tsconfig
- Properly bail on `VNode` and `ComponentPublicInstance` in runtime-core

packages/runtime-core/src/index.ts

@@ -87,6 +87,23 @@ export {
 
 // Types -----------------------------------------------------------------------
 
+import { VNode } from './vnode'
+import { ComponentInternalInstance } from './component'
+
+// Augment Ref unwrap bail types.
+// Note: if updating this, also update `types/refBail.d.ts`.
+declare module '@vue/reactivity' {
+  export interface RefUnwrapBailTypes {
+    runtimeCoreBailTypes:
+      | VNode
+      | {
+          // directly bailing on ComponentPublicInstance results in recursion
+          // so we use this as a bail hint
+          $: ComponentInternalInstance
+        }
+  }
+}
+
 export {
   ReactiveEffect,
   ReactiveEffectOptions,

packages/runtime-core/types/refBail.d.ts

@@ -0,0 +1,14 @@
+// Note: this file is auto concatenated to the end of the bundled d.ts during
+// build.
+
+declare module '@vue/reactivity' {
+  export interface RefUnwrapBailTypes {
+    runtimeCoreBailTypes:
+      | VNode
+      | {
+          // directly bailing on ComponentPublicInstance results in recursion
+          // so we use this as a bail hint
+          $: ComponentInternalInstance
+        }
+  }
+}