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

src/checkbox-group/index.js

@@ -0,0 +1,24 @@
+import { createNamespace } from '../utils';
+import { ParentMixin } from '../mixins/relation';
+
+const [createComponent, bem] = createNamespace('checkbox-group');
+
+export default createComponent({
+  mixins: [ParentMixin('vanCheckbox')],
+
+  props: {
+    max: Number,
+    value: Array,
+    disabled: Boolean
+  },
+
+  watch: {
+    value(val) {
+      this.$emit('change', val);
+    }
+  },
+
+  render(h) {
+    return <div class={bem()}>{this.slots()}</div>;
+  }
+});