我对如何正确将Firebase的Typescript类型添加到React应用感到困惑?
我收到以下错误:
类型'({firebase}:Props)=>元素的参数不能分配给类型'ComponentType <{}>'的参数。 类型'({{firebase}:Props)=>元素'不可分配给'FunctionComponent <{}>'类型。 参数'__0'和'props'的类型不兼容。 类型'{children ?: ReactNode;类型中缺少属性'firebase'。 }”,但在“道具”类型中必填。ts(2345)
这包含以下组件:
import React from 'react'
import { withFirebase } from '../Firebase'
interface Props {
firebase: firebase.app.App
}
const Admin = ({ firebase }: Props) => {
const [isLoading, setIsLoading] = React.useState(false)
const [users, setUsers] = React.useState<U[]>([])
React.useEffect(() => {
console.log(typeof firebase)
setIsLoading(true)
const usersRef = firebase.database().ref(`users/`)
usersRef.on(`value`, (snapshot: any) => {
const usersObj = snapshot.val()
const usersLi = Object.keys(usersObj).map(key => ({
...usersObj[key],
uid: key,
}))
setUsers(usersLi)
})
setIsLoading(false)
return () => usersRef.off()
}, [firebase])
return (
<div>
<h1>Admin</h1>
{isLoading && <p>Fetching data...</p>}
<UserList users={users} />
</div>
)
}
interface U {
uid: string
username: string
email: string
}
interface UL {
users: U[]
}
const UserList = ({ users }: UL) => (
<ul>
{users.map(user => (
<li
key={user.uid}
style={{
borderBottom: '1px solid #f4f4f4',
paddingBottom: '10px',
marginBottom: '10px',
}}
>
<span style={{ display: 'block' }}>
<strong>ID:</strong> {user.uid}
</span>
<span style={{ display: 'block' }}>
<strong>username:</strong> {user.username}
</span>
<span style={{ display: 'block' }}>
<strong>Email:</strong> {user.email}
</span>
</li>
))}
</ul>
)
export default withFirebase(Admin)
看着@types/firebase
npm package,它说Firebase现在提供了它自己的类型。但是我不确定如何正确设置它。
非常感谢。
答案 0 :(得分:0)
结果是我的HOC withFirebase
:
import React from 'react'
const FirebaseContext = React.createContext()
export const withFirebase = Component => (props: any) => (
<FirebaseContext.Consumer>
{firebase => <Component {...props} firebase={firebase} />}
</FirebaseContext.Consumer>
)
export default FirebaseContext
问题是我没有为createContext
:React.createContext<firebase.app.App>
提供类型,我需要将firebaseApp的实例传递给createContext
,使它像这样:>
const FirebaseContext = React.createContext<firebase.app.App>(firebaseApp)
我还需要为组件添加一个Type,使withFirebase
:
import React from 'react'
import firebaseApp from './firebase'
const FirebaseContext = React.createContext<firebase.app.App>(firebaseApp)
export const withFirebase = (
Component: React.ComponentType<{ firebase: firebase.app.App }>,
) => (props: any) => (
<FirebaseContext.Consumer>
{firebase => <Component {...props} firebase={firebase} />}
</FirebaseContext.Consumer>
)
export default FirebaseContext