add file

node_modules/@vant/weapp/dist/radio-group/index.d.ts

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+export {};

node_modules/@vant/weapp/dist/radio-group/index.js

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+import { VantComponent } from '../common/component';
+import { useChildren } from '../common/relation';
+VantComponent({
+    field: true,
+    relation: useChildren('radio'),
+    props: {
+        value: {
+            type: null,
+            observer: 'updateChildren',
+        },
+        direction: String,
+        disabled: {
+            type: Boolean,
+            observer: 'updateChildren',
+        },
+    },
+    methods: {
+        updateChildren() {
+            this.children.forEach((child) => child.updateFromParent());
+        },
+    },
+});

node_modules/@vant/weapp/dist/radio-group/index.json

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+{
+  "component": true
+}

node_modules/@vant/weapp/dist/radio-group/index.wxml

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+<wxs src="../wxs/utils.wxs" module="utils" />
+
+<view class="{{ utils.bem('radio-group', [direction]) }}">
+  <slot></slot>
+</view>

node_modules/@vant/weapp/dist/radio-group/index.wxss

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+@import '../common/index.wxss';.van-radio-group--horizontal{display:flex;flex-wrap:wrap}