Every time I attempt to destructure the state object in react typescript, I encounter the error message stating 'Object is possibly undefined'

Whenever I attempt to destructure my state object in react typescript, I encounter an error stating Object is possibly 'undefined'. When I try using optional chaining, a different error pops up saying

const newUser: NewUser | undefined Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.

The error occurs when trying to destructure the object

RegisterUser(newUser?.email, newUser?.password, newUser?.name, navigate)

This is my Code:

type NewUser ={
    name: string,
    email: string,
    password: string,
    navigate: string
}


const Register = () => {
    const [newUser, setNewUser] = useState<NewUser>() // single object will return
  
    const [RegisterUser] = UseFirebase()
    const navigate = useNavigate()

    const handleValues = (e: any) => {
        const field = e.target.name;
        const value = e.target.value
        const user: any = { ...newUser }
        user[field] = value
        setNewUser(user)

    }

    const handleRegister = (e: any) => {
        e.preventDefault()
        // ERROR
        RegisterUser(newUser.email, newUser.password, newUser.name, navigate)
        // console.log('user name', newUser.name, newUser.email, newUser.password);
    }
.......

Could someone please point out what kind of mistake I might have made?

Answer №1

When working with TypeScript, it's important to ensure that you handle undefined values properly. One way to do this is by checking if certain properties have values before proceeding.

const validateUserInput = (e: any) => {
    e.preventDefault()
    if (user?.email && user?.password && user?.name) {
        submitUserData(user.email, user.password, user.name)
    } else { 
        // Handle errors or prompt the user to input missing information
    }
}

Answer №2

In the case where your object is not defined, it is recommended to:

   RegisterUser(newUser!.email, newUser!.password, newUser!.name, navigate)

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