情况
- 我遇到了这个错误
'user' does not exist on type 'DefaultRootState'。
我试图解决它,但我没有想出解决方案。
这是我的 repo
错误
C:/Users/taiga/Github/Typescript/typescript-admin/admin/src/secure/components/Nav.tsx
TypeScript error in C:/Users/taiga/Github/Typescript/typescript-admin/admin/src/secure/components/Nav.tsx(44,50):
Property 'user' does not exist on type 'DefaultRootState'. TS2339
Nav.tsx
class Nav extends Component<{ user: User }> {
state = {
redirect: false
};
handleClick = async () => {
await axios.post('logout', {});
this.setState({
redirect: true
});
};
render() {
if (this.state.redirect) {
return <Redirect to={'/login'} />;
}
return (
<nav className="navbar navbar-dark sticky-top bg-dark flex-md-nowrap p-0 shadow">
<ul className="my-2 my-md-0 mr-md-3">
<Link to={'/profile'} className="p-2 text-white">
{this.props.user.name}
</Link>
</ul>
</nav>
);
}
}
export default connect((state) => ({ user: state.user }))(Nav);
user.ts
mport { Role } from './role';
export class User {
id: number;
first_name: string;
last_name: string;
email: string;
role: Role;
permissions: string[];
constructor(
id = 0,
first_name = '',
last_name = '',
email = '',
role = new Role(),
permissions: string[] = []
) {
this.id = id;
this.first_name = first_name;
this.last_name = last_name;
this.email = email;
this.role = role;
this.permissions = permissions;
}
setUserReducer.ts
import { User } from '../../classes/user';
const setUserReducer = (
state = { user: new User() },
action: { type: string; user: User }
) => {
switch (action.type) {
case 'SET_USER':
return {
...state,
user: action.user
};
default:
return state;
}
};
export default setUserReducer;
最佳答案
问题在于 connect
HOC 不知道 state
的类型是您特定应用程序状态的类型,而不仅仅是任何状态类型。当它不知道你的特定状态的类型时,它假定状态是类型DefaultRootState
,即defined in the react-redux types package作为一个空对象 {}
.
有多种方法可以解决这个问题。根据 types 包的建议,一种可能性是覆盖 DefaultRootState
的定义并将其替换为应用的实际状态接口(interface)。
This interface can be augmented by users to add default types for the root state when using react-redux. Use module augmentation to append your own type definition in a your_custom_type.d.ts file. https://www.typescriptlang.org/docs/handbook/declaration-merging.html#module-augmentation
另一种更容易实现的可能性是在 mapStateToProps
函数中声明预期的状态类型。
export default connect((state: {user: User}) => ({ user: state.user }))(Nav);
现在 typescript 知道你的 state
有一个 user
类型为 User
的属性。
您还可以在调用 connect
函数时为其设置通用参数,不过我建议使用之前的方法。
export default connect<{user: User}, {}, {}, {user: User}>((state) => ({ user: state.user }))(Nav);
关于typescript - 类型 'user' 上不存在属性 'DefaultRootState',我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/65387046/