是否可以将Vue 3与组合API和Vue类组件一起使用？

Question

在过去的8个月里，我们使用vue 3和类组件构建了一个项目，但似乎不再维护它，我们希望逐渐切换到组合API，更准确地说是切换到设置脚本语法。

我们目前正在使用vue3。0.0和vue类组件8.0.0。

我们的目标是，因为我们必须不断向项目添加新功能，开始使用composition API创建新组件，同时保留那些已经使用vue class component编写的组件。而且，在我们继续的过程中，我们将尝试用合成API重写它们。

我尝试使用vue类组件创建一个简单的HelloWorld组件：

<template>
 <div>
   <TestComponent :test="'test string'" />
 </div>
</template>

<script lang="ts">
import { Options, Vue } from 'vue-class-component';
import TestComponent from './TestComponent.vue';

@Options({
 components: { TestComponent }
})
export default class HelloWorld extends Vue {
}
</script>

并添加一个测试组件：

<template>
  <h1>Test composant {{ test }}</h1>
</template>

<script lang="ts">
export default {
  name: 'TestComponent',
  props: { test: {type: String, required: true }},
  setup(props: { test: string }, context: unknown) { console.log(context); return { test: props.test } }
}
</script>

但是，我在代码中出现了一个错误：当在HelloWorld中声明TestComponent时，编译器告诉我他期待TestComponent中声明的参数“test”：

Argument of type '{ name: string; props: { test: StringConstructor; required: boolean; }; setup(props: { test: string; }, context: unknown): { test: string; }; }' is not assignable to parameter of type 'Component<any, any, any, ComputedOptions, MethodOptions>'.
  Type '{ name: string; props: { test: StringConstructor; required: boolean; }; setup(props: { test: string; }, context: unknown): { test: string; }; }' is not assignable to type 'ComponentOptions<any, any, any, ComputedOptions, MethodOptions, any, any, any>'.
    Type '{ name: string; props: { test: StringConstructor; required: boolean; }; setup(props: { test: string; }, context: unknown): { test: string; }; }' is not assignable to type 'ComponentOptionsBase<any, any, any, ComputedOptions, MethodOptions, any, any, any, string, {}>'.
      Types of property 'setup' are incompatible.
        Type '(props: { test: string; }, context: unknown) => { test: string; }' is not assignable to type '(this: void, props: Readonly<LooseRequired<any>>, ctx: SetupContext<any>) => any'.
          Types of parameters 'props' and 'props' are incompatible.
            Property 'test' is missing in type 'Readonly<LooseRequired<any>>' but required in type '{ test: string; }'.ts(2345)
TestComponent.vue.ts(5, 18): 'test' is declared here.

更新：我试图在main中全局注册TestComponent。ts，但错误仍然是一样的

有没有办法让两者协同工作？

Answer 1

请注意，：test是v-bind:test的语法糖，这意味着如果没有：test的反应变量绑定，应该使用test。见下文：

// note there is no colon before test, which means you are just passing a constant string.
<TestComponent test="test string" />

Answer 2

一个问题是您的props声明不正确。应该是：

// ❌ invalid
// props: {
//   test: String,
//   required: true
// },

props: {
  test: {
    type: String,
    required: true
  }
},

此外，您不需要键入setup（）的参数，因为它们通常是从defineComponent（）实用程序推断出来的，该实用程序在Vue组件中启用类型推断：

// export default {
//   setup(props: { test: string }, context: unknown) { /*...*/ }
// }

import { defineComponent } from 'vue'
export default defineComponent({
  setup(props, context) { /*...*/ }
})