[improvement] Cell: functional (#2729)

packages/utils/functional.ts

@@ -1,4 +1,5 @@
-import { RenderContext, VNodeData } from 'vue';
+import { RenderContext, VNodeData } from 'vue/types';
+import { ScopedSlot } from 'vue/types/vnode';
 
 type ObjectIndex = {
   [key: string]: any;
@@ -40,9 +41,23 @@ export function emit(context: Context, eventName: string, ...args: any[]) {
     if (Array.isArray(listeners)) {
       listeners.forEach(listener => {
         listener(...args);
-      })
+      });
     } else {
       listeners(...args);
     }
   }
 }
+
+// unify slots & scopedSlots
+export function unifySlots(context: Context) {
+  const { scopedSlots } = context;
+  const slots = context.slots();
+
+  Object.keys(slots).forEach(key => {
+    if (!scopedSlots[key]) {
+      scopedSlots[key] = () => slots[key];
+    }
+  });
+
+  return scopedSlots;
+}