types: (wip) improve dts output

packages/runtime-core/src/componentSlots.ts

@@ -1,16 +1,10 @@
 import { ComponentInternalInstance, currentInstance } from './component'
-import {
-  VNode,
-  NormalizedChildren,
-  normalizeVNode,
-  VNodeChild,
-  VNodeChildren
-} from './vnode'
+import { VNode, NormalizedChildren, normalizeVNode, VNodeChild } from './vnode'
 import { isArray, isFunction } from '@vue/shared'
 import { ShapeFlags } from './shapeFlags'
 import { warn } from './warning'
 
-export type Slot = (...args: any[]) => VNodeChildren
+export type Slot = (...args: any[]) => VNode[]
 
 export type InternalSlots = {
   [name: string]: Slot

packages/runtime-core/src/index.ts

@@ -30,7 +30,7 @@ export { PublicPatchFlags as PatchFlags } from '@vue/shared'
 export { getCurrentInstance } from './component'
 
 // For custom renderers
-export { createRenderer } from './createRenderer'
+export { createRenderer, RootRenderFunction } from './createRenderer'
 export { warn } from './warning'
 export {
   handleError,

packages/runtime-core/src/keepAlive.ts

@@ -135,7 +135,7 @@ export const KeepAlive = {
 
     return () => {
       if (!slots.default) {
-        return
+        return null
       }
 
       const children = slots.default()

packages/runtime-core/src/vnode.ts

@@ -25,9 +25,12 @@ export const Portal = Symbol(__DEV__ ? 'Portal' : undefined)
 export const Text = Symbol(__DEV__ ? 'Text' : undefined)
 export const Comment = Symbol(__DEV__ ? 'Comment' : undefined)
 
-const Suspense = (__FEATURE_SUSPENSE__
-  ? SuspenseImpl
-  : null) as typeof SuspenseImpl
+// Export as {} to avoid circular type dependency between `suspense.ts` and
+// `createRenderer.ts` in exported types.
+// A circular type dependency causes tsc to generate d.ts with dynmaic import()
+// calls using realtive paths, which works for separate d.ts files, but will
+// fail after d.ts rollup with API Extractor.
+const Suspense = (__FEATURE_SUSPENSE__ ? SuspenseImpl : null) as {}
 export { Suspense }
 
 export type VNodeTypes =