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node_modules/vant/lib/collapse-item/index.css

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+.van-collapse-item{position:relative}.van-collapse-item--border::after{position:absolute;box-sizing:border-box;content:' ';pointer-events:none;top:0;right:16px;left:16px;border-top:1px solid #ebedf0;-webkit-transform:scaleY(.5);transform:scaleY(.5)}.van-collapse-item__title .van-cell__right-icon::before{-webkit-transform:rotate(90deg) translateZ(0);transform:rotate(90deg) translateZ(0);-webkit-transition:-webkit-transform .3s;transition:-webkit-transform .3s;transition:transform .3s;transition:transform .3s,-webkit-transform .3s}.van-collapse-item__title::after{right:16px;display:none}.van-collapse-item__title--expanded .van-cell__right-icon::before{-webkit-transform:rotate(-90deg);transform:rotate(-90deg)}.van-collapse-item__title--expanded::after{display:block}.van-collapse-item__title--borderless::after{display:none}.van-collapse-item__title--disabled{cursor:not-allowed}.van-collapse-item__title--disabled,.van-collapse-item__title--disabled .van-cell__right-icon{color:#c8c9cc}.van-collapse-item__title--disabled:active{background-color:#fff}.van-collapse-item__wrapper{overflow:hidden;-webkit-transition:height .3s ease-in-out;transition:height .3s ease-in-out;will-change:height}.van-collapse-item__content{padding:12px 16px;color:#969799;font-size:14px;line-height:1.5;background-color:#fff}

node_modules/vant/lib/collapse-item/index.js

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+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
+
+exports.__esModule = true;
+exports.default = void 0;
+
+var _extends2 = _interopRequireDefault(require("@babel/runtime/helpers/extends"));
+
+var _utils = require("../utils");
+
+var _raf = require("../utils/dom/raf");
+
+var _relation = require("../mixins/relation");
+
+var _cell = _interopRequireDefault(require("../cell"));
+
+var _shared = require("../cell/shared");
+
+// Utils
+// Mixins
+// Components
+var _createNamespace = (0, _utils.createNamespace)('collapse-item'),
+    createComponent = _createNamespace[0],
+    bem = _createNamespace[1];
+
+var CELL_SLOTS = ['title', 'icon', 'right-icon'];
+
+var _default = createComponent({
+  mixins: [(0, _relation.ChildrenMixin)('vanCollapse')],
+  props: (0, _extends2.default)({}, _shared.cellProps, {
+    name: [Number, String],
+    disabled: Boolean,
+    lazyRender: {
+      type: Boolean,
+      default: true
+    },
+    isLink: {
+      type: Boolean,
+      default: true
+    }
+  }),
+  data: function data() {
+    return {
+      show: null,
+      inited: null
+    };
+  },
+  computed: {
+    currentName: function currentName() {
+      var _this$name;
+
+      return (_this$name = this.name) != null ? _this$name : this.index;
+    },
+    expanded: function expanded() {
+      var _this = this;
+
+      if (!this.parent) {
+        return null;
+      }
+
+      var _this$parent = this.parent,
+          value = _this$parent.value,
+          accordion = _this$parent.accordion;
+
+      if (process.env.NODE_ENV === 'development' && !accordion && !Array.isArray(value)) {
+        console.error('[Vant] Collapse: type of prop "value" should be Array');
+        return;
+      }
+
+      return accordion ? value === this.currentName : value.some(function (name) {
+        return name === _this.currentName;
+      });
+    }
+  },
+  created: function created() {
+    this.show = this.expanded;
+    this.inited = this.expanded;
+  },
+  watch: {
+    expanded: function expanded(_expanded, prev) {
+      var _this2 = this;
+
+      if (prev === null) {
+        return;
+      }
+
+      if (_expanded) {
+        this.show = true;
+        this.inited = true;
+      } // Use raf: flick when opened in safari
+      // Use nextTick: closing animation failed when set `user-select: none`
+
+
+      var nextTick = _expanded ? this.$nextTick : _raf.raf;
+      nextTick(function () {
+        var _this2$$refs = _this2.$refs,
+            content = _this2$$refs.content,
+            wrapper = _this2$$refs.wrapper;
+
+        if (!content || !wrapper) {
+          return;
+        }
+
+        var offsetHeight = content.offsetHeight;
+
+        if (offsetHeight) {
+          var contentHeight = offsetHeight + "px";
+          wrapper.style.height = _expanded ? 0 : contentHeight; // use double raf to ensure animation can start
+
+          (0, _raf.doubleRaf)(function () {
+            wrapper.style.height = _expanded ? contentHeight : 0;
+          });
+        } else {
+          _this2.onTransitionEnd();
+        }
+      });
+    }
+  },
+  methods: {
+    onClick: function onClick() {
+      if (!this.disabled) {
+        this.toggle();
+      }
+    },
+    // @exposed-api
+    toggle: function toggle(expanded) {
+      if (expanded === void 0) {
+        expanded = !this.expanded;
+      }
+
+      var parent = this.parent,
+          currentName = this.currentName;
+      var close = parent.accordion && currentName === parent.value;
+      var name = close ? '' : currentName;
+      this.parent.switch(name, expanded);
+    },
+    onTransitionEnd: function onTransitionEnd() {
+      if (!this.expanded) {
+        this.show = false;
+      } else {
+        this.$refs.wrapper.style.height = '';
+      }
+    },
+    genTitle: function genTitle() {
+      var _this3 = this;
+
+      var h = this.$createElement;
+      var border = this.border,
+          disabled = this.disabled,
+          expanded = this.expanded;
+      var titleSlots = CELL_SLOTS.reduce(function (slots, name) {
+        if (_this3.slots(name)) {
+          slots[name] = function () {
+            return _this3.slots(name);
+          };
+        }
+
+        return slots;
+      }, {});
+
+      if (this.slots('value')) {
+        titleSlots.default = function () {
+          return _this3.slots('value');
+        };
+      }
+
+      return h(_cell.default, {
+        "attrs": {
+          "role": "button",
+          "tabindex": disabled ? -1 : 0,
+          "aria-expanded": String(expanded)
+        },
+        "class": bem('title', {
+          disabled: disabled,
+          expanded: expanded,
+          borderless: !border
+        }),
+        "on": {
+          "click": this.onClick
+        },
+        "scopedSlots": titleSlots,
+        "props": (0, _extends2.default)({}, this.$props)
+      });
+    },
+    genContent: function genContent() {
+      var h = this.$createElement;
+
+      if (this.inited || !this.lazyRender) {
+        return h("div", {
+          "directives": [{
+            name: "show",
+            value: this.show
+          }],
+          "ref": "wrapper",
+          "class": bem('wrapper'),
+          "on": {
+            "transitionend": this.onTransitionEnd
+          }
+        }, [h("div", {
+          "ref": "content",
+          "class": bem('content')
+        }, [this.slots()])]);
+      }
+    }
+  },
+  render: function render() {
+    var h = arguments[0];
+    return h("div", {
+      "class": [bem({
+        border: this.index && this.border
+      })]
+    }, [this.genTitle(), this.genContent()]);
+  }
+});
+
+exports.default = _default;

node_modules/vant/lib/collapse-item/index.less

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+@import '../style/var';
+@import '../style/mixins/hairline';
+
+.van-collapse-item {
+  position: relative;
+
+  &--border {
+    &::after {
+      .hairline-top(@cell-border-color, @padding-md, @padding-md);
+    }
+  }
+
+  &__title {
+    .van-cell__right-icon::before {
+      // using translateZ to fix safari rendering issues
+      // see: https://github.com/vant-ui/vant/issues/8608
+      transform: rotate(90deg) translateZ(0);
+      transition: transform @collapse-item-transition-duration;
+    }
+
+    &::after {
+      right: @padding-md;
+      display: none;
+    }
+
+    &--expanded {
+      .van-cell__right-icon::before {
+        transform: rotate(-90deg);
+      }
+
+      &::after {
+        display: block;
+      }
+    }
+
+    &--borderless {
+      &::after {
+        display: none;
+      }
+    }
+
+    &--disabled {
+      cursor: not-allowed;
+
+      &,
+      & .van-cell__right-icon {
+        color: @collapse-item-title-disabled-color;
+      }
+
+      &:active {
+        background-color: @white;
+      }
+    }
+  }
+
+  &__wrapper {
+    overflow: hidden;
+    transition: height @collapse-item-transition-duration ease-in-out;
+    will-change: height;
+  }
+
+  &__content {
+    padding: @collapse-item-content-padding;
+    color: @collapse-item-content-text-color;
+    font-size: @collapse-item-content-font-size;
+    line-height: @collapse-item-content-line-height;
+    background-color: @collapse-item-content-background-color;
+  }
+}

node_modules/vant/lib/collapse-item/style/index.js

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+require('../../style/base.css');
+require('../../info/index.css');
+require('../../icon/index.css');
+require('../../cell/index.css');
+require('../index.css');

node_modules/vant/lib/collapse-item/style/less.js

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+require('../../style/base.less');
+require('../../info/index.less');
+require('../../icon/index.less');
+require('../../cell/index.less');
+require('../index.less');