v2 first commit

resources/assets/js/components/Collapse/Collapse.vue

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+<template>
+  <div
+    id="accordion"
+    role="tablist"
+    aria-multiselectable="true"
+    class="accordion"
+  >
+    <slot></slot>
+  </div>
+</template>
+
+<script>
+export default {
+  name: 'collapse',
+  props: {
+    animationDuration: {
+      type: Number,
+      default: 250,
+      description: 'Collapse animation duration'
+    },
+    multipleActive: {
+      type: Boolean,
+      default: true,
+      description: 'Whether you can have multiple collapse items opened at the same time'
+    },
+    activeIndex: {
+      type: Number,
+      default: -1,
+      description: 'Active collapse item index'
+    }
+  },
+  provide() {
+    return {
+      animationDuration: this.animationDuration,
+      multipleActive: this.multipleActive,
+      addItem: this.addItem,
+      removeItem: this.removeItem,
+      deactivateAll: this.deactivateAll
+    };
+  },
+  data() {
+    return {
+      items: []
+    };
+  },
+  methods: {
+    addItem(item) {
+      const index = this.$slots.default.indexOf(item.$vnode);
+      if (index !== -1) {
+        this.items.splice(index, 0, item);
+      }
+    },
+    removeItem(item) {
+      const items = this.items;
+      const index = items.indexOf(item);
+      if (index > -1) {
+        items.splice(index, 1);
+      }
+    },
+    deactivateAll() {
+      this.items.forEach(item => {
+        item.active = false;
+      });
+    },
+    activateItem() {
+      if (this.activeIndex !== -1) {
+        this.items[this.activeIndex].active = true;
+      }
+    }
+  },
+  mounted() {
+    this.$nextTick(() => {
+      this.activateItem();
+    });
+  },
+  watch: {
+    activeIndex() {
+      this.activateItem();
+    }
+  }
+};
+</script>
+
+<style scoped></style>