npm install v-treeview --save

import VTreeview from "v-treeview"

export default {
  data() { ...     
  },
  computed: { ...
  },
  methods: { ...
  },  
  components: {
    VTreeview
  }
};

<script defer src="https://use.fontawesome.com/releases/v5.0.6/js/all.js"></script>

  <v-treeview v-model="treeData" :treeTypes="treeTypes" @selected="selected" :openAll="openAll" :contextItems="contextItems" @contextSelected="contextSelected"></v-treeview>

import VTreeview from "../src/index.js";

export default {
  data() {
    return {
      openAll: true,
      treeTypes: [
        {
          type: "#",
          max_children: 6,
          max_depth: 4,
          valid_children: [
            "FMM_EMPLOYEE",
            "FMM_SPOUSE",
            "FMM_CHILD",
            "FMM_SIBLING",
            "FMM_PARENT",
            "FMM_PARENT_IN_LAW"
          ]
        },
        {
          type: "FMM_EMPLOYEE",
          icon: "far fa-user",
          valid_children: ["Basic", "Top-up"]
        },
        {
          type: "FMM_SPOUSE",
          icon: "far fa-user",
          valid_children: ["Basic", "Top-up"]
        },
        {
          type: "FMM_CHILD",
          icon: "far fa-user",
          valid_children: ["Basic", "Top-up"]
        },
        {
          type: "FMM_SIBLING",
          icon: "far fa-user",
          valid_children: ["Basic", "Top-up"]
        },
        {
          type: "FMM_PARENT",
          icon: "far fa-user",
          valid_children: ["Basic", "Top-up"]
        },
        {
          type: "FMM_PARENT_IN_LAW",
          icon: "far fa-user",
          valid_children: ["Basic", "Top-up"]
        },
        {
          type: "Basic",
          icon: "far fa-hospital",
          valid_children: ["Top-up"]
        },
        {
          type: "Top-up",
          icon: "far fa-plus-square",
          valid_children: []
        }
      ],
      treeData: [
        {
          id: 100767.0, text: "Employee", type: "FMM_EMPLOYEE", count: 0,
          children: [
            {
              id: 100811.0, text: "Basic plan", type: "Basic", count: 0,
              children: [
                {
                  id: 101161.0, text: "Top-up", type: "Top-up", count: 152, children: []
                }
              ]
            },
            {
              id: 100812.0, text: "Basic plan", type: "Basic", count: 0, children: []
            },
            {
              id: 101162.0, text: "This Top-up can be at level 2", type: "Top-up", count: 152, children: []
            }
          ]
        },
        {
          id: 100768.0, text: "Spouse", type: "FMM_SPOUSE", count: 0,
          children: [
            {
              id: 100813.0, text: "Basic plan", type: "Basic", count: 0, children: [
                {
                  id: 101163.0, text: "Top-up", type: "Top-up", count: 152, children: []
                }
              ]
            },
            {
              id: 100814.0, text: "Basic plan", type: "Basic", count: 0, children: [
                {
                  id: 101164.0, text: "Top-up", type: "Top-up", count: 152, children: []
                }
              ]
            }
          ]
        },
        {
          id: 100769.0, text: "Child", type: "FMM_CHILD", count: 0, children: [
            {
              id: 100815.0, text: "Basic plan", type: "Basic", count: 0, children: [
                {
                  id: 101165.0, text: "Top-up", type: "Top-up", count: 152, children: []
                }
              ]
            },
            {
              id: 100816.0, text: "Basic plan", type: "Basic", count: 0, children: [
                {
                  id: 101166.0, text: "Top-up", type: "Top-up", count: 0, children: []
                }
              ]
            }
          ]
        },
        {
          id: 100770.0, text: "Parents", type: "FMM_PARENT", count: 0, children: [
            {
              id: 100817.0, text: "Basic plan", type: "Basic", count: 0, children: [
                {
                  id: 101167.0, text: "Top-up", type: "Top-up", count: 124, children: []
                }
              ]
            }
          ]
        }
      ],
      contextItems: [],
      selectedNode: null
    };
  },
  methods: {
    getTypeRule(type) {
      var typeRule = this.treeTypes.filter(t => t.type == type)[0];
      return typeRule;
    },
    contextSelected(command) {
      switch (command) {
        case "Create Basic":
          var node = {
            text: "New Basic Plan",
            type: "Basic",
            children: []
          };
          this.selectedNode.addNode(node);
          break;
        case "Create Top-up":
          var node = {
            text: "New Top-up",
            type: "Top-up",
            children: []
          };
          this.selectedNode.addNode(node);          
          break;
        case "Rename":
          this.selectedNode.editName();
          break;
        case "Remove":
          break;
      }
    },
    selected(node) {
      this.selectedNode = node;
      this.contextItems = [];
      var typeRule = this.getTypeRule(this.selectedNode.model.type);
      typeRule.valid_children.map(function(type, key) {
        var childType = this.getTypeRule(type);
        var item = {
          title: "Create " + type,
          icon: childType.icon,
          type: childType
        };
        this.contextItems.push(item);
      }, this);

      this.contextItems.push({ title: "Rename", icon: "far fa-edit" });
      this.contextItems.push({ title: "Remove", icon: "far fa-trash-alt" });
    }
  },
  components: {
    VTreeview
  }
};