执行监听器

src/typings/auto-imports.d.ts

@@ -5,73 +5,85 @@
 // Generated by unplugin-auto-import
 export {}
 declare global {
-  const EffectScope: typeof import('vue')['EffectScope']
+  const EffectScope: (typeof import('vue'))['EffectScope']
-  const ElCheckbox: typeof import('element-plus/es')['ElCheckbox']
+  const ElCheckbox: (typeof import('element-plus/es'))['ElCheckbox']
-  const ElDivider: typeof import('element-plus/es')['ElDivider']
+  const ElDivider: (typeof import('element-plus/es'))['ElDivider']
-  const ElInput: typeof import('element-plus/es')['ElInput']
+  const ElInput: (typeof import('element-plus/es'))['ElInput']
-  const ElInputNumber: typeof import('element-plus/es')['ElInputNumber']
+  const ElInputNumber: (typeof import('element-plus/es'))['ElInputNumber']
-  const ElRadio: typeof import('element-plus/es')['ElRadio']
+  const ElRadio: (typeof import('element-plus/es'))['ElRadio']
-  const ElSelect: typeof import('element-plus/es')['ElSelect']
+  const ElSelect: (typeof import('element-plus/es'))['ElSelect']
-  const computed: typeof import('vue')['computed']
+  const computed: (typeof import('vue'))['computed']
-  const createApp: typeof import('vue')['createApp']
+  const createApp: (typeof import('vue'))['createApp']
-  const customRef: typeof import('vue')['customRef']
+  const customRef: (typeof import('vue'))['customRef']
-  const defineAsyncComponent: typeof import('vue')['defineAsyncComponent']
+  const defineAsyncComponent: (typeof import('vue'))['defineAsyncComponent']
-  const defineComponent: typeof import('vue')['defineComponent']
+  const defineComponent: (typeof import('vue'))['defineComponent']
-  const effectScope: typeof import('vue')['effectScope']
+  const effectScope: (typeof import('vue'))['effectScope']
-  const getCurrentInstance: typeof import('vue')['getCurrentInstance']
+  const getCurrentInstance: (typeof import('vue'))['getCurrentInstance']
-  const getCurrentScope: typeof import('vue')['getCurrentScope']
+  const getCurrentScope: (typeof import('vue'))['getCurrentScope']
-  const h: typeof import('vue')['h']
+  const h: (typeof import('vue'))['h']
-  const inject: typeof import('vue')['inject']
+  const inject: (typeof import('vue'))['inject']
-  const isProxy: typeof import('vue')['isProxy']
+  const isProxy: (typeof import('vue'))['isProxy']
-  const isReactive: typeof import('vue')['isReactive']
+  const isReactive: (typeof import('vue'))['isReactive']
-  const isReadonly: typeof import('vue')['isReadonly']
+  const isReadonly: (typeof import('vue'))['isReadonly']
-  const isRef: typeof import('vue')['isRef']
+  const isRef: (typeof import('vue'))['isRef']
-  const markRaw: typeof import('vue')['markRaw']
+  const markRaw: (typeof import('vue'))['markRaw']
-  const nextTick: typeof import('vue')['nextTick']
+  const nextTick: (typeof import('vue'))['nextTick']
-  const onActivated: typeof import('vue')['onActivated']
+  const onActivated: (typeof import('vue'))['onActivated']
-  const onBeforeMount: typeof import('vue')['onBeforeMount']
+  const onBeforeMount: (typeof import('vue'))['onBeforeMount']
-  const onBeforeRouteLeave: typeof import('vue-router')['onBeforeRouteLeave']
+  const onBeforeRouteLeave: (typeof import('vue-router'))['onBeforeRouteLeave']
-  const onBeforeRouteUpdate: typeof import('vue-router')['onBeforeRouteUpdate']
+  const onBeforeRouteUpdate: (typeof import('vue-router'))['onBeforeRouteUpdate']
-  const onBeforeUnmount: typeof import('vue')['onBeforeUnmount']
+  const onBeforeUnmount: (typeof import('vue'))['onBeforeUnmount']
-  const onBeforeUpdate: typeof import('vue')['onBeforeUpdate']
+  const onBeforeUpdate: (typeof import('vue'))['onBeforeUpdate']
-  const onDeactivated: typeof import('vue')['onDeactivated']
+  const onDeactivated: (typeof import('vue'))['onDeactivated']
-  const onErrorCaptured: typeof import('vue')['onErrorCaptured']
+  const onErrorCaptured: (typeof import('vue'))['onErrorCaptured']
-  const onMounted: typeof import('vue')['onMounted']
+  const onMounted: (typeof import('vue'))['onMounted']
-  const onRenderTracked: typeof import('vue')['onRenderTracked']
+  const onRenderTracked: (typeof import('vue'))['onRenderTracked']
-  const onRenderTriggered: typeof import('vue')['onRenderTriggered']
+  const onRenderTriggered: (typeof import('vue'))['onRenderTriggered']
-  const onScopeDispose: typeof import('vue')['onScopeDispose']
+  const onScopeDispose: (typeof import('vue'))['onScopeDispose']
-  const onServerPrefetch: typeof import('vue')['onServerPrefetch']
+  const onServerPrefetch: (typeof import('vue'))['onServerPrefetch']
-  const onUnmounted: typeof import('vue')['onUnmounted']
+  const onUnmounted: (typeof import('vue'))['onUnmounted']
-  const onUpdated: typeof import('vue')['onUpdated']
+  const onUpdated: (typeof import('vue'))['onUpdated']
-  const provide: typeof import('vue')['provide']
+  const provide: (typeof import('vue'))['provide']
-  const reactive: typeof import('vue')['reactive']
+  const reactive: (typeof import('vue'))['reactive']
-  const readonly: typeof import('vue')['readonly']
+  const readonly: (typeof import('vue'))['readonly']
-  const ref: typeof import('vue')['ref']
+  const ref: (typeof import('vue'))['ref']
-  const resolveComponent: typeof import('vue')['resolveComponent']
+  const resolveComponent: (typeof import('vue'))['resolveComponent']
-  const shallowReactive: typeof import('vue')['shallowReactive']
+  const shallowReactive: (typeof import('vue'))['shallowReactive']
-  const shallowReadonly: typeof import('vue')['shallowReadonly']
+  const shallowReadonly: (typeof import('vue'))['shallowReadonly']
-  const shallowRef: typeof import('vue')['shallowRef']
+  const shallowRef: (typeof import('vue'))['shallowRef']
-  const toRaw: typeof import('vue')['toRaw']
+  const toRaw: (typeof import('vue'))['toRaw']
-  const toRef: typeof import('vue')['toRef']
+  const toRef: (typeof import('vue'))['toRef']
-  const toRefs: typeof import('vue')['toRefs']
+  const toRefs: (typeof import('vue'))['toRefs']
-  const toValue: typeof import('vue')['toValue']
+  const toValue: (typeof import('vue'))['toValue']
-  const triggerRef: typeof import('vue')['triggerRef']
+  const triggerRef: (typeof import('vue'))['triggerRef']
-  const unref: typeof import('vue')['unref']
+  const unref: (typeof import('vue'))['unref']
-  const useAttrs: typeof import('vue')['useAttrs']
+  const useAttrs: (typeof import('vue'))['useAttrs']
-  const useCssModule: typeof import('vue')['useCssModule']
+  const useCssModule: (typeof import('vue'))['useCssModule']
-  const useCssVars: typeof import('vue')['useCssVars']
+  const useCssVars: (typeof import('vue'))['useCssVars']
-  const useLink: typeof import('vue-router')['useLink']
+  const useLink: (typeof import('vue-router'))['useLink']
-  const useRoute: typeof import('vue-router')['useRoute']
+  const useRoute: (typeof import('vue-router'))['useRoute']
-  const useRouter: typeof import('vue-router')['useRouter']
+  const useRouter: (typeof import('vue-router'))['useRouter']
-  const useSlots: typeof import('vue')['useSlots']
+  const useSlots: (typeof import('vue'))['useSlots']
-  const watch: typeof import('vue')['watch']
+  const watch: (typeof import('vue'))['watch']
-  const watchEffect: typeof import('vue')['watchEffect']
+  const watchEffect: (typeof import('vue'))['watchEffect']
-  const watchPostEffect: typeof import('vue')['watchPostEffect']
+  const watchPostEffect: (typeof import('vue'))['watchPostEffect']
-  const watchSyncEffect: typeof import('vue')['watchSyncEffect']
+  const watchSyncEffect: (typeof import('vue'))['watchSyncEffect']
 }
 // for type re-export
 declare global {
   // @ts-ignore
-  export type { Component, ComponentPublicInstance, ComputedRef, ExtractDefaultPropTypes, ExtractPropTypes, ExtractPublicPropTypes, InjectionKey, PropType, Ref, VNode, WritableComputedRef } from 'vue'
+  export type {
+    Component,
+    ComponentPublicInstance,
+    ComputedRef,
+    ExtractDefaultPropTypes,
+    ExtractPropTypes,
+    ExtractPublicPropTypes,
+    InjectionKey,
+    PropType,
+    Ref,
+    VNode,
+    WritableComputedRef
+  } from 'vue'
   import('vue')
 }

src/typings/components.d.ts

@@ -9,6 +9,7 @@ declare module 'vue' {
   export interface GlobalComponents {
     AdvancedFilter: typeof import('./../components/AdvancedFilter/index.vue')['default']
     ElAvatar: typeof import('element-plus/es')['ElAvatar']
+    ElBadge: typeof import('element-plus/es')['ElBadge']
     ElButton: typeof import('element-plus/es')['ElButton']
     ElButtonGroup: typeof import('element-plus/es')['ElButtonGroup']
     ElCard: typeof import('element-plus/es')['ElCard']

src/views/flowDesign/index.vue

@@ -203,6 +203,7 @@ const addApproval = (node: FlowNode) => {
     pid: node.id,
     type: 'approval',
     name: '审批人',
+    executionListeners: [],
     child: child,
     // 属性
     assigneeType: 'user',

src/views/flowDesign/nodes/EndNode.vue

@@ -1,22 +1,62 @@
-<script setup lang="ts"></script>
+<script setup lang="ts">
+import type { FlowNode } from '@/views/flowDesign/nodes/type'
+import type { Ref } from 'vue'
+
+const _inject = inject<{
+  readOnly?: Ref<boolean>
+}>('flowDesign', { readOnly: ref(false) })
+const $emits = defineEmits<{
+  (e: 'activeNode', node: FlowNode): void
+}>()
+const $props = withDefaults(
+  defineProps<{
+    node: FlowNode
+    readOnly?: boolean
+  }>(),
+  {
+    readOnly: false
+  }
+)
+const _readOnly = computed(() => _inject.readOnly?.value || $props.readOnly)
+const activeNode = () => {
+  if (_readOnly.value) return
+  $emits('activeNode', $props.node)
+}
+</script>
 
 <template>
-  <div class="end-node">
+  <div class="node-box">
-    <div class="end-node-circle" />
+    <div class="end-node-circle"></div>
-    <el-text>流程结束</el-text>
+    <div class="end-node" @click="activeNode">
+      <el-text>{{ node.name }}</el-text>
+    </div>
   </div>
 </template>
 
 <style scoped lang="scss">
-.end-node {
+.node-box {
-  padding: 0 0 30px;
+  position: relative;
 
   .end-node-circle {
     width: 10px;
     height: 10px;
     border-radius: 50%;
     background-color: var(--el-border-color);
-    margin: auto;
+    margin: auto auto 5px;
+  }
+
+  .end-node {
+    position: relative;
+    background: var(--el-border-color-lighter);
+    padding: 7px 24px;
+    border-radius: 24px;
+    cursor: pointer;
+    overflow: visible;
+    z-index: 10;
+
+    &:hover {
+      box-shadow: 0 0 5px 0 var(--el-color-primary);
+    }
   }
 }
 </style>

src/views/flowDesign/nodes/type.ts

@@ -15,9 +15,16 @@ export interface FlowNode {
   pid?: string
   name: string
   type: NodeType
+  executionListeners?: NodeListener[]
   child?: FlowNode
 }
 
+export interface NodeListener {
+  event: string
+  implementationType: 'class' | 'expression' | 'delegateExpression'
+  implementation: string
+}
+
 export interface StartNode extends FlowNode {
   formProperties: FormProperty[]
 }
@@ -77,6 +84,8 @@ export interface ApprovalNode extends AssigneeNode {
   formProperties: FormProperty[]
   // 操作权限
   operations: OperationPermissions
+  // 任务监听器
+  taskListeners?: NodeListener[]
 }
 
 export interface TimerNode extends FlowNode {

src/views/flowDesign/panels/ApprovalPanel.vue

@@ -4,6 +4,7 @@ import type { Field } from '@/components/Render/type'
 import UserSelector from '@/components/UserSelector/index.vue'
 import AssigneePanel from './AssigneePanel.vue'
 import type { Ref } from 'vue'
+import TaskListeners from './TaskListeners.vue'
 
 const { fields } = inject<{ fields: Ref<Field[]>; admin: string[] }>('flowDesign', {
   fields: ref([]),
@@ -133,6 +134,9 @@ watchEffect(() => {
             placeholder="指定人员"
           />
         </el-form-item>
+        <el-form-item prop="taskListeners" label="任务监听器">
+          <TaskListeners :node="activeData" />
+        </el-form-item>
       </el-form>
     </el-tab-pane>
     <el-tab-pane label="表单权限" name="formPermissions">

src/views/flowDesign/panels/EndPanel.vue

@@ -0,0 +1,18 @@
+<script setup lang="ts">
+import type { EndNode } from '../nodes/type'
+import ExecutionListeners from './ExecutionListeners.vue'
+
+defineProps<{
+  activeData: EndNode
+}>()
+</script>
+
+<template>
+  <el-form label-position="top" label-width="90px">
+    <el-form-item prop="executionListeners" label="执行监听器">
+      <ExecutionListeners :node="activeData" />
+    </el-form-item>
+  </el-form>
+</template>
+
+<style scoped lang="scss"></style>

src/views/flowDesign/panels/ExecutionListeners.vue

@@ -0,0 +1,107 @@
+<script setup lang="ts">
+import type { FlowNode } from '@/views/flowDesign/nodes/type'
+
+const props = defineProps<{
+  node: FlowNode
+}>()
+const drawer = ref(false)
+const addListener = () => {
+  if (!props.node.executionListeners) {
+    props.node.executionListeners = []
+  }
+  props.node.executionListeners?.push({
+    event: 'start',
+    implementationType: 'delegateExpression',
+    implementation: ''
+  })
+}
+const delListener = (index: number) => {
+  props.node.executionListeners?.splice(index, 1)
+}
+</script>
+
+<template>
+  <div>
+    <slot>
+      <el-badge :value="node.executionListeners?.length || 0" class="item" type="primary">
+        <el-button icon="Setting" @click="drawer = true"> 配置</el-button>
+      </el-badge>
+    </slot>
+    <el-drawer v-model="drawer" title="执行监听器">
+      <div class="flex-col">
+        <el-button @click="addListener" type="primary" icon="Plus">添加监听器</el-button>
+        <div v-for="(item, index) in node.executionListeners" :key="index" class="listener-box">
+          <el-button
+            class="listener-close"
+            @click="delListener(index)"
+            plain
+            circle
+            icon="CircleClose"
+            size="small"
+            type="danger"
+          />
+          <el-form-item label="事件" :prop="`executionListeners.${index}.event`">
+            <el-radio-group v-model="item.event">
+              <el-radio-button label="开始" value="start" />
+              <el-radio-button label="结束" value="end" />
+              <el-radio-button label="迁移" value="take" />
+            </el-radio-group>
+          </el-form-item>
+          <el-form-item label="类型" :prop="`executionListeners.${index}.implementationType`">
+            <el-radio-group v-model="item.implementationType">
+              <el-radio-button label="委托表达式" value="delegateExpression" />
+              <el-radio-button label="java类" value="class" />
+              <el-radio-button label="表达式" value="expression" />
+            </el-radio-group>
+          </el-form-item>
+          <el-form-item label="监听器" :prop="`executionListeners.${index}.implementation`">
+            <template #label>
+              <div class="flex-items-center gap3px">
+                <span>监听器</span>
+                <el-tooltip placement="top-start">
+                  <template #content>
+                    实现 ExecutionListener 接口 <br />
+                    委托表达式：${myExecutionListener} <br />
+                    表达式: ${myExecutionListener.notify(execution)} <br />
+                    java类：${com.example.listener.MyExecutionListener}
+                  </template>
+                  <el-icon>
+                    <QuestionFilled />
+                  </el-icon>
+                </el-tooltip>
+              </div>
+            </template>
+            <el-input v-model="item.implementation" placeholder="请输入监听器" clearable>
+            </el-input>
+          </el-form-item>
+        </div>
+      </div>
+    </el-drawer>
+  </div>
+</template>
+
+<style scoped lang="scss">
+.listener-box {
+  border: 1px dashed var(--el-border-color);
+  border-radius: var(--el-border-radius-base);
+  margin-top: 10px;
+  padding: 7px;
+  position: relative;
+
+  &:hover {
+    border-color: var(--el-color-primary);
+
+    .listener-close {
+      display: block;
+    }
+  }
+
+  .listener-close {
+    position: absolute;
+    top: -7px;
+    right: -7px;
+    z-index: 1;
+    display: none;
+  }
+}
+</style>

src/views/flowDesign/panels/StartPanel.vue

@@ -2,11 +2,13 @@
 import type { FormProperty, StartNode } from '../nodes/type'
 import type { Field } from '@/components/Render/type'
 import type { Ref } from 'vue'
+import ExecutionListeners from './ExecutionListeners.vue'
 
 const { fields } = inject<{ fields: Ref<Field[]> }>('flowDesign', { fields: ref([]) })
 const props = defineProps<{
   activeData: StartNode
 }>()
+const activeName = ref('basicSettings')
 const allReadonly = computed({
   get() {
     return props.activeData.formProperties.every((e) => e.readonly)
@@ -84,33 +86,46 @@ watchEffect(() => {
 </script>
 
 <template>
-  <el-table :data="activeData.formProperties">
+  <el-tabs v-model="activeName" stretch class="el-segmented">
-    <el-table-column prop="name" label="字段" />
+    <el-tab-pane label="基础设置" name="basicSettings">
-    <el-table-column prop="readonly">
+      <el-form label-position="top" label-width="90px">
-      <template #header>
+        <el-form-item prop="executionListeners" label="执行监听器">
-        <el-checkbox v-model="allReadonly" label="只读" />
+          <ExecutionListeners :node="activeData" />
-      </template>
+        </el-form-item>
-      <template #default="{ row }">
+      </el-form>
-        <el-checkbox v-model="row.readonly" @change="changeReadonly(row)" />
+    </el-tab-pane>
-      </template>
+    <el-tab-pane label="表单权限" name="formPermissions">
-    </el-table-column>
+      <el-table :data="activeData.formProperties">
-    <el-table-column prop="required">
+        <el-table-column prop="name" label="字段" />
-      <template #header>
+        <el-table-column prop="readonly">
-        <el-checkbox v-model="allRequired" label="必填" />
+          <template #header>
-      </template>
+            <el-checkbox v-model="allReadonly" label="只读" />
-      <template #default="{ row }">
+          </template>
-        <el-checkbox v-model="row.required" @change="changeRequired(row)" />
+          <template #default="{ row }">
-      </template>
+            <el-checkbox v-model="row.readonly" @change="changeReadonly(row)" />
-    </el-table-column>
+          </template>
-    <el-table-column prop="hidden">
+        </el-table-column>
-      <template #header>
+        <el-table-column prop="required">
-        <el-checkbox v-model="allHidden" label="隐藏" />
+          <template #header>
-      </template>
+            <el-checkbox v-model="allRequired" label="必填" />
-      <template #default="{ row }">
+          </template>
-        <el-checkbox v-model="row.hidden" @change="changeHidden(row)" />
+          <template #default="{ row }">
-      </template>
+            <el-checkbox v-model="row.required" @change="changeRequired(row)" />
-    </el-table-column>
+          </template>
-  </el-table>
+        </el-table-column>
+        <el-table-column prop="hidden">
+          <template #header>
+            <el-checkbox v-model="allHidden" label="隐藏" />
+          </template>
+          <template #default="{ row }">
+            <el-checkbox v-model="row.hidden" @change="changeHidden(row)" />
+          </template>
+        </el-table-column>
+      </el-table>
+    </el-tab-pane>
+  </el-tabs>
 </template>
 
-<style scoped lang="scss"></style>
+<style scoped lang="scss">
+@import '@/styles/el-segmented.scss';
+</style>

src/views/flowDesign/panels/TaskListeners.vue

@@ -0,0 +1,107 @@
+<script setup lang="ts">
+import type { ApprovalNode } from '@/views/flowDesign/nodes/type'
+
+const props = defineProps<{
+  node: ApprovalNode
+}>()
+const drawer = ref(false)
+const addListener = () => {
+  if (!props.node.taskListeners) {
+    props.node.taskListeners = []
+  }
+  props.node.taskListeners?.push({
+    event: 'create',
+    implementationType: 'delegateExpression',
+    implementation: ''
+  })
+}
+const delListener = (index: number) => {
+  props.node.taskListeners?.splice(index, 1)
+}
+</script>
+
+<template>
+  <div>
+    <slot>
+      <el-badge :value="node.taskListeners?.length || 0" class="item" type="primary">
+        <el-button icon="Setting" @click="drawer = true"> 配置</el-button>
+      </el-badge>
+    </slot>
+    <el-drawer v-model="drawer" title="任务监听器">
+      <div class="flex-col">
+        <el-button @click="addListener" type="primary" icon="Plus">添加监听器</el-button>
+        <div v-for="(item, index) in node.taskListeners" :key="index" class="listener-box">
+          <el-button
+            class="listener-close"
+            @click="delListener(index)"
+            plain
+            circle
+            icon="CircleClose"
+            size="small"
+            type="danger"
+          />
+          <el-form-item label="事件" :prop="`taskListeners.${index}.event`">
+            <el-radio-group v-model="item.event">
+              <el-radio-button label="创建" value="create" />
+              <el-radio-button label="指派" value="assignment" />
+              <el-radio-button label="完成" value="complete" />
+              <el-radio-button label="删除" value="delete" />
+            </el-radio-group>
+          </el-form-item>
+          <el-form-item label="类型" :prop="`taskListeners.${index}.implementationType`">
+            <el-radio-group v-model="item.implementationType">
+              <el-radio-button label="委托表达式" value="delegateExpression" />
+              <el-radio-button label="java类" value="class" />
+              <el-radio-button label="表达式" value="expression" />
+            </el-radio-group>
+          </el-form-item>
+          <el-form-item label="监听器" :prop="`taskListeners.${index}.implementation`">
+            <template #label>
+              <div class="flex-items-center gap3px">
+                <span>监听器</span>
+                <el-tooltip placement="top-start">
+                  <template #content>
+                    委托表达式：${myCreateTaskListener} <br />
+                    表达式: ${myCreateTaskListener.notify(execution)} <br />
+                    java类：${com.example.listener.MyCreateTaskListener}
+                  </template>
+                  <el-icon>
+                    <QuestionFilled />
+                  </el-icon>
+                </el-tooltip>
+              </div>
+            </template>
+            <el-input v-model="item.implementation" placeholder="请输入监听器" clearable>
+            </el-input>
+          </el-form-item>
+        </div>
+      </div>
+    </el-drawer>
+  </div>
+</template>
+
+<style scoped lang="scss">
+.listener-box {
+  border: 1px dashed var(--el-border-color);
+  border-radius: var(--el-border-radius-base);
+  margin-top: 10px;
+  padding: 7px;
+  position: relative;
+
+  &:hover {
+    border-color: var(--el-color-primary);
+
+    .listener-close {
+      display: block;
+    }
+  }
+
+  .listener-close {
+    position: absolute;
+    top: -7px;
+    right: -7px;
+    z-index: 1;
+    display: none;
+  }
+}
+</style>

src/views/flowDesign/panels/index.vue

@@ -7,6 +7,7 @@ import Cc from './CcPanel.vue'
 import Timer from './TimerPanel.vue'
 import Notify from './NotifyPanel.vue'
 import Condition from './ConditionPanel.vue'
+import End from './EndPanel.vue'
 import type { FlowNode } from '../nodes/type'
 
 defineProps<{
@@ -19,7 +20,8 @@ const panels: Recordable<Component> = {
   cc: Cc,
   timer: Timer,
   notify: Notify,
-  condition: Condition
+  condition: Condition,
+  end: End
 }
 const showInput = ref(false)
 const onClickOutside = () => {

src/views/home/index.vue

@@ -10,12 +10,14 @@ const process = ref<FlowNode>({
   pid: undefined,
   type: 'start',
   name: '发起人',
+  executionListeners: [],
   formProperties: [],
   child: {
     id: 'end',
     pid: 'root',
     type: 'end',
-    name: '结束',
+    name: '流程结束',
+    executionListeners: [],
     child: undefined
   } as EndNode
 } as StartNode)