Unpacking objects in Typescript

Question

Unpacking objects in Typescript

I am facing an issue with the following code. I'm not sure what is causing the error or how to fix it. The specific error message is:

Type 'CookieSessionObject | null | undefined' is not assignable to type '{ token: string; refreshToken: string; }'.
  Type 'undefined' is not assignable to type '{ token: string; refreshToken: string; }'

...
  namespace CookieSessionInterfaces {
    interface CookieSessionObject {
      token?: string;
      refreshToken?: string;
    }
  }
}

const currentUser = async (req: Request, res: Response, next: NextFunction) => {
  const { token, refreshToken }: { token: string, refreshToken: string } = req.session;
...

Additionally, req.session?.token and req.session?.refreshToken are functioning properly.

typescript express

Answer 1

Answer №1

req.session may be null or undefined. Therefore, in this scenario, you can address it as follows:

type Tokens  = {
    token?: string, 
    refreshToken?: string
}

const { token, refreshToken }: Tokens = req.session || {token: null, refreshToken: null}

Alternatively, if session is either undefined or null, you could choose to throw an exception which can be caught later and managed accordingly.

if (!req.session) {
        throw new UnauthorizeException()
}

const { token, refreshToken }: Tokens = req.session

Your UnauthorizeException might be a custom exception or you could opt for a generic one instead.

In case you are implementing a callback function, remember to call the callback instead of throwing an exception.

Answer 2

req.session may be null or undefined. Therefore, in this scenario, you can address it as follows:

type Tokens  = {
    token?: string, 
    refreshToken?: string
}

const { token, refreshToken }: Tokens = req.session || {token: null, refreshToken: null}

Alternatively, if session is either undefined or null, you could choose to throw an exception which can be caught later and managed accordingly.

if (!req.session) {
        throw new UnauthorizeException()
}

const { token, refreshToken }: Tokens = req.session

Your UnauthorizeException might be a custom exception or you could opt for a generic one instead.

In case you are implementing a callback function, remember to call the callback instead of throwing an exception.

Unpacking objects in Typescript

Answer №1

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