feat(composition api): defineExpose

components/define-expose-foo/define-expose-foo.uvue

+<script setup>
+  const str = 'foo str'
+  const num = ref(0)
+  const increment = () => {
+    num.value++
+  }
+  
+  defineExpose({
+    str,
+    num,
+    increment
+  })
+  
+</script>

pages/composition-api/basic/define-expose/define-expose.test.js

+const PAGE_PATH = '/pages/composition-api/basic/define-expose/define-expose'
+
+describe('defineExpose', () => {
+  if (process.env.uniTestPlatformInfo.startsWith('android')) {
+    let page = null
+    beforeAll(async () => {
+      page = await program.reLaunch(PAGE_PATH)
+      await page.waitFor('view')
+    })
+    it('basic', async () => {
+      const fooStr = await page.$('#foo-str')
+      expect(await fooStr.text()).toBe('str from component Foo: foo str')
+      const fooNum = await page.$('#foo-num')
+      expect(await fooNum.text()).toBe('num from component Foo: 0')
+      
+      const incrementBtn = await page.$('#increment-btn')
+      await incrementBtn.tap()
+      
+      expect(await fooNum.text()).toBe('num from component Foo: 1')
+    })
+  } else {
+    it('other platform', () => {
+      expect(1).toBe(1)
+    })
+  }
+})
\ No newline at end of file

pages/composition-api/basic/define-expose/define-expose.uvue

-<template>
-  <view class="page"> defineExpose </view>
-</template>
-
-<script setup></script>
+<template>
+  <view class="page">
+    <define-expose-foo ref='fooRef' />
+    <text id="foo-str" class="uni-common-mt">str from component Foo: {{fooStr}}</text>
+    <text id="foo-num" class="uni-common-mt">num from component Foo: {{fooNum}}</text>
+    <button id="increment-btn" class="uni-common-mt" @click="increment">trigger Foo increment</button>
+  </view>
+</template>
+
+<script setup>
+  const fooRef = ref<DefineExposeFooComponentPublicInstance | null>(null)
+  const fooStr = ref('')
+  const fooNum = ref<number>(0)
+  
+  onMounted(() => {
+    fooStr.value = fooRef.value!.str
+    fooNum.value = fooRef.value!.num
+  })
+  
+  const increment = () => {
+    fooRef.value!.increment()
+    fooNum.value = fooRef.value!.num
+  }
+</script>

pages/tab-bar/composition-api.uvue

@@ -55,7 +55,7 @@
           {
             name: 'defineExpose',
             url: 'define-expose',
-            enable: false,
+            enable: true,
           },
           {
             name: 'defineOptions',