[improvement] declare functional sfc (#2695)

packages/switch-cell/index.js

@@ -5,34 +5,27 @@ import SwitchMixin from '../mixins/switch';
 
 const [sfc, bem] = use('switch-cell');
 
-export default sfc(
-  {
-    mixins: [SwitchMixin],
+export default sfc({
+  functional: true,
 
-    props: {
-      title: String,
-      border: Boolean,
-      size: {
-        type: String,
-        default: '24px'
-      }
-    },
+  mixins: [SwitchMixin],
 
-    render(h, context, inherit) {
-      const { props } = context;
-
-      return (
-        <Cell
-          center
-          title={props.title}
-          border={props.border}
-          class={bem()}
-          {...inherit}
-        >
-          <Switch {...{ props, on: context.listeners }} />
-        </Cell>
-      );
+  props: {
+    title: String,
+    border: Boolean,
+    size: {
+      type: String,
+      default: '24px'
     }
   },
-  true
-);
+
+  render(h, context, inherit) {
+    const { props } = context;
+
+    return (
+      <Cell center title={props.title} border={props.border} class={bem()} {...inherit}>
+        <Switch {...{ props, on: context.listeners }} />
+      </Cell>
+    );
+  }
+});