save

src/platforms/web/runtime/components/index.js

@@ -1,5 +1,7 @@
+import Transition from './transition'
 import TransitionControl from './transition-control'
 
 export default {
+  Transition,
   TransitionControl
 }

src/platforms/web/runtime/components/transition.js

@@ -0,0 +1,28 @@
+// import { emptyVNode } from 'core/vdom/vnode'
+
+export default {
+  name: 'transition',
+  props: ['name', 'appear', 'tag'],
+  _abstract: true,
+  render (h) {
+    const children = this.$slots.default
+    const props = this.$options.propsData
+    if (!children || !children.length) {
+      return
+    }
+    for (let i = 0; i < children.length; i++) {
+      const child = children[i]
+      ;(child.data || (child.data = {})).transition = props
+    }
+    if (children.length > 1) {
+      if (!props.tag) {
+        throw new Error('prop "tag" is required when <transition> contains more than one element.')
+      }
+      return h(props.tag, this.$vnode.data, children)
+    } else {
+      const child = children[0]
+      child.key = child.key || `__v${this._uid}__`
+      return child
+    }
+  }
+}