[improvement] rename packages dir to src (#3659)

src/radio-group/index.js

@@ -0,0 +1,27 @@
+import { createNamespace } from '../utils';
+import { ParentMixin } from '../mixins/relation';
+
+const [createComponent, bem] = createNamespace('radio-group');
+
+export default createComponent({
+  mixins: [ParentMixin('vanRadio')],
+
+  props: {
+    value: null,
+    disabled: Boolean
+  },
+
+  watch: {
+    value(value) {
+      this.$emit('change', value);
+    }
+  },
+
+  render(h) {
+    return (
+      <div class={bem()} role="radiogroup">
+        {this.slots()}
+      </div>
+    );
+  }
+});