chore: move mixins

src-next/mixins/slots.js

@@ -0,0 +1,18 @@
+/**
+ * Use scopedSlots in Vue 2.6+
+ * downgrade to slots in lower version
+ */
+export const SlotsMixin = {
+  methods: {
+    slots(name = 'default', props) {
+      const { $slots, $scopedSlots } = this;
+      const scopedSlot = $scopedSlots[name];
+
+      if (scopedSlot) {
+        return scopedSlot(props);
+      }
+
+      return $slots[name];
+    },
+  },
+};