export-expose.md

exportExpose

在 Vue SFC script-setup 中将 export 语句转换为 defineExpose 参数。

特性	支持
Vue 3	✅
Nuxt 3	?
Vue 2	?
Volar Plugin	❌

用法

支持以下语法：

• 局部变量/函数/类
• 别名导出
• 从其他文件导出
• 命名空间导出
• 重命名导出

1. 局部变量/函数/类

<script setup lang="ts">
export const foo: string = 'foo',
  bar = 10
export let baz: string | undefined
export var qux = fn()
export const { a, b, c } = { a: 1, b: 2, c: 3 }

export function fn() {}
export class A {}
</script>

::: details 编译后代码

<script lang="ts">
const foo: string = 'foo',
bar = 10
let baz: string | undefined
const qux = fn()
const { a, b, c } = { a: 1, b: 2, c: 3 }

function fn() {}
class A {}


defineExpose({
  foo,
  bar,
  baz,
  qux,
  a,
  b,
  c,
  fn,
  A,
})
</script>

:::

2. 别名导出

<script setup lang="ts">
export { foo as foo1 }
</script>

::: details 编译后代码

<script setup lang="ts">
defineExpose({
  foo1: foo,
})
</script>

:::

3. 从其他文件导出

<script setup lang="ts">
export { foo, type Foo, foo as bar } from './types'
</script>

::: details 编译后代码

<script setup lang="ts">
import { type Foo, foo as __MACROS_expose_0, foo as __MACROS_expose_1 } from './types'
defineExpose({
  foo: __MACROS_expose_0,
  bar: __MACROS_expose_1,
})
</script>

:::

4. 命名空间导出

<script setup lang="ts">
export * as foo from './types'
</script>

::: details 编译后代码

<script setup lang="ts">
import * as __MACROS_expose_0 from './types'
defineExpose({
  foo: __MACROS_expose_0,
})
</script>

:::

5. 重命名导出

<script setup lang="ts">
const foo = 1,
  bar = 1

export { foo } from './types'
export * as bar from './types'
</script>

::: details 编译后代码

<script setup lang="ts">
import { foo as __MACROS_expose_0 } from './types'
import * as __MACROS_expose_1 from './types'

const foo = 1,
  bar = 1
defineExpose({
  foo: __MACROS_expose_0,
  bar: __MACROS_expose_1,
})
</script>

:::

限制

当前不支持以下语法：

// 1. 全部导出 ❌
export * from '../types'

// 2. 默认导出 ❌
const a = 'a'
export default a