add file

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

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+export {};

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

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+import { useChildren } from '../common/relation';
+import { VantComponent } from '../common/component';
+VantComponent({
+    field: true,
+    relation: useChildren('checkbox', function (target) {
+        this.updateChild(target);
+    }),
+    props: {
+        max: Number,
+        value: {
+            type: Array,
+            observer: 'updateChildren',
+        },
+        disabled: {
+            type: Boolean,
+            observer: 'updateChildren',
+        },
+        direction: {
+            type: String,
+            value: 'vertical',
+        },
+    },
+    methods: {
+        updateChildren() {
+            this.children.forEach((child) => this.updateChild(child));
+        },
+        updateChild(child) {
+            const { value, disabled, direction } = this.data;
+            child.setData({
+                value: value.indexOf(child.data.name) !== -1,
+                parentDisabled: disabled,
+                direction,
+            });
+        },
+    },
+});

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

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+{
+  "component": true
+}

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

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

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

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