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node_modules/vant/es/sidebar/index.css

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+.van-sidebar{width:80px;overflow-y:auto;-webkit-overflow-scrolling:touch}

node_modules/vant/es/sidebar/index.js

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+import { createNamespace } from '../utils';
+import { ParentMixin } from '../mixins/relation';
+
+var _createNamespace = createNamespace('sidebar'),
+    createComponent = _createNamespace[0],
+    bem = _createNamespace[1];
+
+export default createComponent({
+  mixins: [ParentMixin('vanSidebar')],
+  model: {
+    prop: 'activeKey'
+  },
+  props: {
+    activeKey: {
+      type: [Number, String],
+      default: 0
+    }
+  },
+  data: function data() {
+    return {
+      index: +this.activeKey
+    };
+  },
+  watch: {
+    activeKey: function activeKey() {
+      this.setIndex(+this.activeKey);
+    }
+  },
+  methods: {
+    setIndex: function setIndex(index) {
+      if (index !== this.index) {
+        this.index = index;
+        this.$emit('change', index);
+      }
+    }
+  },
+  render: function render() {
+    var h = arguments[0];
+    return h("div", {
+      "class": bem()
+    }, [this.slots()]);
+  }
+});

node_modules/vant/es/sidebar/index.less

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+@import '../style/var';
+
+.van-sidebar {
+  width: @sidebar-width;
+  overflow-y: auto;
+  -webkit-overflow-scrolling: touch;
+}

node_modules/vant/es/sidebar/style/index.js

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+import '../../style/base.css';
+import '../index.css';

node_modules/vant/es/sidebar/style/less.js

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+import '../../style/base.less';
+import '../index.less';