feat(core): support v-show directive (#310)

packages/runtime-dom/__tests__/directives/vShow.spec.ts

@@ -0,0 +1,128 @@
+import {
+  withDirectives,
+  createComponent,
+  h,
+  nextTick,
+  VNode
+} from '@vue/runtime-core'
+import { createApp, vShow } from '@vue/runtime-dom'
+
+const withVShow = (node: VNode, exp: any) =>
+  withDirectives(node, [[vShow, exp]])
+
+let app: any, root: any
+
+beforeEach(() => {
+  app = createApp()
+  root = document.createElement('div') as any
+})
+
+describe('runtime-dom: v-show directive', () => {
+  test('should check show value is truthy', async () => {
+    const component = createComponent({
+      data() {
+        return { value: true }
+      },
+      render() {
+        return [withVShow(h('div'), this.value)]
+      }
+    })
+    app.mount(component, root)
+
+    const $div = root.querySelector('div')
+
+    expect($div.style.display).toEqual('')
+  })
+
+  test('should check show value is falsy', async () => {
+    const component = createComponent({
+      data() {
+        return { value: false }
+      },
+      render() {
+        return [withVShow(h('div'), this.value)]
+      }
+    })
+    app.mount(component, root)
+
+    const $div = root.querySelector('div')
+
+    expect($div.style.display).toEqual('none')
+  })
+
+  it('should update show value changed', async () => {
+    const component = createComponent({
+      data() {
+        return { value: true }
+      },
+      render() {
+        return [withVShow(h('div'), this.value)]
+      }
+    })
+    app.mount(component, root)
+
+    const $div = root.querySelector('div')
+    const data = root._vnode.component.data
+
+    expect($div.style.display).toEqual('')
+
+    data.value = false
+    await nextTick()
+    expect($div.style.display).toEqual('none')
+
+    data.value = {}
+    await nextTick()
+    expect($div.style.display).toEqual('')
+
+    data.value = 0
+    await nextTick()
+    expect($div.style.display).toEqual('none')
+
+    data.value = []
+    await nextTick()
+    expect($div.style.display).toEqual('')
+
+    data.value = null
+    await nextTick()
+    expect($div.style.display).toEqual('none')
+
+    data.value = '0'
+    await nextTick()
+    expect($div.style.display).toEqual('')
+
+    data.value = undefined
+    await nextTick()
+    expect($div.style.display).toEqual('none')
+
+    data.value = 1
+    await nextTick()
+    expect($div.style.display).toEqual('')
+  })
+
+  test('should respect display value in style attribute', async () => {
+    const component = createComponent({
+      data() {
+        return { value: true }
+      },
+      render() {
+        return [
+          withVShow(h('div', { style: { display: 'block' } }), this.value)
+        ]
+      }
+    })
+    app.mount(component, root)
+
+    const $div = root.querySelector('div')
+    const data = root._vnode.component.data
+
+    expect($div.style.display).toEqual('block')
+
+    data.value = false
+    await nextTick()
+    expect($div.style.display).toEqual('none')
+
+    data.value = true
+    await nextTick()
+    expect($div.style.display).toEqual('block')
+  })
+})