我创建了一个
controller
插件,可以在每个组件中全局使用,但我无法使其与 Vue 3 + TypeScript + Composition API 一起使用,我收到 TypeScript 错误
ui/plugins/controllers.ts
import { App } from 'vue'
import { provider, IProvider } from '@/core/presentation/provider'
export default {
install: (app: App) => {
const controllers: IProvider = provider()
app.provide('controllers', controllers)
}
}
main.ts
import { createApp } from 'vue'
import { controllers } from './ui'
createApp(App)
.use(controllers)
.mount('#app')
@/core/presentation/provider/provider.ts
import { UserController } from '../controllers'
import { IProvider } from './provider.types'
export const provider = (): IProvider => ({
users: new UserController()
})
ui/views/Component.vue
import { onMounted, ref, inject, defineComponent } from 'vue'
export default defineComponent({
setup() {
const controllers = inject('controllers')
const user = ref()
const getUser = async () => {
const result = await controllers.users.getById(1)
if (result) {
user.value = result.toJson()
}
}
onMounted(getUser)
return {
user,
getUser
}
}
})
当我尝试在这一行使用控制器时,出现打字稿错误
const result = await controllers.users.getById(1)
错误:
const controllers: unknown Object is of type 'unknown'.Vetur(2571)
如果我像这样使用界面设置类型,我会收到另一个打字稿错误
import { IProvider } from '@/core'
...
const controllers: IProvider = inject('controllers')
错误:
type 'IProvider | undefined' is not assignable to type 'IProvider'. Type 'undefined' is not assignable to type 'IProvider'.Vetur(2322)
我只能让它像这样工作,但我觉得这很奇怪:
const controllers: IProvider | undefined = inject('controllers')
...
const result = await controllers?.users.getById(1)
我设法通过发布类型安全的 Vue.js 注入来解决我的问题
有一件事要
如果你确定注入总是能够解决,你可以使用非空断言运算符:
const controllers: IProvider = inject('controllers')! // <- notice the exclamation mark!
const result = await controllers.users.getById(1)