feat(ct): vue2 rerender complete (#17929)

Partial fix for https://github.com/microsoft/playwright/issues/15919

packages/playwright-ct-vue/index.d.ts

@@ -42,10 +42,10 @@ type JsonObject = { [Key in string]?: JsonValue };
 type Slot = string | string[];
 
 export interface MountOptions<Props = Record<string, unknown>> {
-  props?: Props,
+  props?: Props;
   slots?: Record<string, Slot> & { default?: Slot };
-  on?: Record<string, Function>,
-  hooksConfig?: JsonObject,
+  on?: Record<string, Function>;
+  hooksConfig?: JsonObject;
 }
 
 interface MountResult<Props = Record<string, unknown>> extends Locator {
@@ -55,7 +55,7 @@ interface MountResult<Props = Record<string, unknown>> extends Locator {
 
 interface MountResultJsx extends Locator {
   unmount(): Promise<void>;
-  rerender(props: JSX.Element): Promise<void>
+  rerender(component: JSX.Element): Promise<void>
 }
 
 export interface ComponentFixtures {

packages/playwright-ct-vue2/index.d.ts

@@ -50,11 +50,16 @@ export interface MountOptions<Props = Record<string, unknown>> {
 
 interface MountResult<Props = Record<string, unknown>> extends Locator {
   unmount(): Promise<void>;
-  rerender(options: { props: Props }): Promise<void>
+  rerender(options: Omit<MountOptions<Props>, 'hooksConfig'>): Promise<void>
+}
+
+interface MountResultJsx extends Locator {
+  unmount(): Promise<void>;
+  rerender(component: JSX.Element): Promise<void>
 }
 
 export interface ComponentFixtures {
-  mount(component: JSX.Element): Promise<MountResult>;
+  mount(component: JSX.Element): Promise<MountResultJsx>;
   mount(component: any, options?: MountOptions): Promise<MountResult>;
   mount<Props>(component: any, options: MountOptions & { props: Props }): Promise<MountResult<Props>>;
 }

packages/playwright-ct-vue2/registerSource.mjs

@@ -37,18 +37,16 @@ export function register(components) {
 /**
  * @param {Component | string} child
  * @param {import('vue').CreateElement} h
- * @returns {import('vue').VNode | string}
  */
-function renderChild(child, h) {
-  return typeof child === 'string' ? child : render(child, h);
+function createChild(child, h) {
+  return typeof child === 'string' ? child : createWrapper(child, h);
 }
 
 /**
  * @param {Component} component
  * @param {import('vue').CreateElement} h
- * @returns {import('vue').VNode}
  */
-function render(component, h) {
+function createComponent(component, h) {
   /**
    * @type {import('vue').Component | string | undefined}
    */
@@ -87,9 +85,9 @@ function render(component, h) {
       if (typeof child !== 'string' && child.type === 'template' && child.kind === 'jsx') {
         const slotProperty = Object.keys(child.props).find(k => k.startsWith('v-slot:'));
         const slot = slotProperty ? slotProperty.substring('v-slot:'.length) : 'default';
-        nodeData.scopedSlots[slot] = () => child.children.map(c => renderChild(c, h));
+        nodeData.scopedSlots[slot] = () => child.children.map(c => createChild(c, h));
       } else {
-        children.push(renderChild(child, h));
+        children.push(createChild(child, h));
       }
     }
 
@@ -110,7 +108,7 @@ function render(component, h) {
     // Vue test util syntax.
     const options = component.options || {};
     for (const [key, value] of Object.entries(options.slots || {})) {
-      const list = (Array.isArray(value) ? value : [value]).map(v => renderChild(v, h));
+      const list = (Array.isArray(value) ? value : [value]).map(v => createChild(v, h));
       if (key === 'default')
         children.push(...list);
       else
@@ -130,18 +128,33 @@ function render(component, h) {
     lastArg = children;
   }
 
-  const wrapper = h(componentFunc, nodeData, lastArg);
+  return { Component: componentFunc, nodeData, slots: lastArg };
+}
+
+/**
+ * @param {Component} component
+ * @param {import('vue').CreateElement} h
+ * @returns {import('vue').VNode}
+ */
+function createWrapper(component, h) {
+  const { Component, nodeData, slots } = createComponent(component, h);
+  const wrapper = h(Component, nodeData, slots);
   return wrapper;
 }
 
 const instanceKey = Symbol('instanceKey');
+const wrapperKey = Symbol('wrapperKey');
 
 window.playwrightMount = async (component, rootElement, hooksConfig) => {
   for (const hook of /** @type {any} */(window).__pw_hooks_before_mount || [])
     await hook({ hooksConfig });
 
   const instance = new Vue({
-    render: h => render(component, h),
+    render: h => {
+      const wrapper = createWrapper(component, h);
+      /** @type {any} */ (rootElement)[wrapperKey] = wrapper;
+      return wrapper;
+    },
   }).$mount();
   rootElement.appendChild(instance.$el);
   /** @type {any} */ (rootElement)[instanceKey] = instance;
@@ -159,10 +172,30 @@ window.playwrightUnmount = async rootElement => {
 };
 
 window.playwrightRerender = async (element, options) => {
-  const component = /** @type {any} */(element)[instanceKey];
-  if (!component)
+  const wrapper = /** @type {any} */(element)[wrapperKey];
+  if (!wrapper)
     throw new Error('Component was not mounted');
 
-  for (const [key, value] of Object.entries(/** @type {any} */(options).props || /** @type {any} */(options).options.props))
-    component.$children[0][key] = value;
+  const component = wrapper.componentInstance;
+  const { nodeData, slots } = createComponent(options, component.$createElement);
+
+
+  for (const [name] of Object.entries(component.$listeners || {})) {
+    component.$off(name);
+    delete component.$listeners[name];
+  }
+
+  for (const [name, value] of Object.entries(nodeData.on || {})) {
+    component.$on(name, value);
+    component.$listeners[name] = value;
+  }
+
+  Object.assign(component.$scopedSlots, nodeData.scopedSlots);
+  component.$slots.default = slots;
+
+  for (const [key, value] of Object.entries(nodeData.props || {}))
+    component[key] = value;
+
+  if (!Object.keys(nodeData.props || {}).length)
+    component.$forceUpdate();
 };

tests/components/ct-vue2-cli/src/components/Counter.vue

@@ -1,8 +1,10 @@
 <template>
-   <div>
-     <span id="remount-count">{{ remountCount }}</span>
-     <span id="rerender-count">{{ count }}</span>
-   </div>
+  <div @click="$emit('submit', 'hello')">
+    <div id="props">{{ count }}</div>
+    <div id="remount-count">{{ remountCount }}</div>
+    <slot name="main" />
+    <slot />
+  </div>
  </template>
 
 <script>

tests/components/ct-vue2-cli/src/notation-jsx.spec.tsx

@@ -12,15 +12,39 @@ test('render props', async ({ mount }) => {
   await expect(component).toContainText('Submit')
 })
 
-test('renderer and keep the component instance intact', async ({ mount }) => {
+test('renderer updates props without remounting', async ({ mount }) => {
   const component = await mount(<Counter count={9001} />)
-  await expect(component.locator('#rerender-count')).toContainText('9001')
-  
+  await expect(component.locator('#props')).toContainText('9001')
+
   await component.rerender(<Counter count={1337} />)
-  await expect(component.locator('#rerender-count')).toContainText('1337')
+  await expect(component).not.toContainText('9001')
+  await expect(component.locator('#props')).toContainText('1337')
+
+  await expect(component.locator('#remount-count')).toContainText('1')
+})
+
+test('renderer updates event listeners without remounting', async ({ mount }) => {
+  const messages = []
+  const component = await mount(<Counter />)
+
+  await component.rerender(<Counter v-on:submit={count => { 
+    messages.push(count) 
+  }} />)
+  await component.click();
+  expect(messages).toEqual(['hello'])
   
-  await component.rerender(<Counter count={42} />)
-  await expect(component.locator('#rerender-count')).toContainText('42')
+  await expect(component.locator('#remount-count')).toContainText('1')
+})
+
+test('renderer updates slots without remounting', async ({ mount }) => {
+  const component = await mount(<Counter>Default Slot</Counter>)
+  await expect(component).toContainText('Default Slot')
+
+  await component.rerender(<Counter>
+    <template v-slot:main>Test Slot</template>
+  </Counter>)
+  await expect(component).not.toContainText('Default Slot')
+  await expect(component).toContainText('Test Slot')
 
   await expect(component.locator('#remount-count')).toContainText('1')
 })

tests/components/ct-vue2-cli/src/notation-vue.spec.ts

@@ -17,19 +17,53 @@ test('render props', async ({ mount }) => {
   await expect(component).toContainText('Submit')
 })
 
-test('renderer and keep the component instance intact', async ({ mount }) => {
-  const component = await mount<{ count: number }>(Counter, {
-    props: {
-      count: 9001
+test('renderer updates props without remounting', async ({ mount }) => {
+  const component = await mount(Counter, {
+    props: { count: 9001 }
+  })
+  await expect(component.locator('#props')).toContainText('9001')
+
+  await component.rerender({
+    props: { count: 1337 }
+  })
+  await expect(component).not.toContainText('9001')
+  await expect(component.locator('#props')).toContainText('1337')
+
+  await expect(component.locator('#remount-count')).toContainText('1')
+})
+
+test('renderer updates event listeners without remounting', async ({ mount }) => {
+  const component = await mount(Counter)
+
+  const messages = []
+  await component.rerender({
+    on: { 
+      submit: data => messages.push(data)
     }
   })
-  await expect(component.locator('#rerender-count')).toContainText('9001')
+  await component.click();
+  expect(messages).toEqual(['hello'])
+  
+  await expect(component.locator('#remount-count')).toContainText('1')
+})
 
-  await component.rerender({ props: { count: 1337 } })
-  await expect(component.locator('#rerender-count')).toContainText('1337')
+test('renderer updates slots without remounting', async ({ mount }) => {
+  const component = await mount(Counter, {
+    slots: { default: 'Default Slot' }
+  })
+  await expect(component).toContainText('Default Slot')
+
+  await component.rerender({
+    slots: { main: 'Test Slot' }
+  })
+  await expect(component).not.toContainText('Default Slot')
+  await expect(component).toContainText('Test Slot')
+
+  await component.rerender({
+    slots: { default: 'Default Slot' }
+  })
+  await expect(component).toContainText('Default Slot')
 
-  await component.rerender({ props: { count: 42 } })
-  await expect(component.locator('#rerender-count')).toContainText('42')
 
   await expect(component.locator('#remount-count')).toContainText('1')
 })