Dealing with type errors involving null values when using interfaces in Typescript

I encountered an issue related to the error property within the defaultState constant:

interface AuthState<T = any> {
  auth: T;
  error: null | Error;
  loading: boolean;
}

export const defaultState: { auth: null | AuthState } = {
  auth: null,
  error: null, // This is where the problem occurs
  loading: false
};

The specific error message reads as follows:

TS2322: Type '{ auth: null; error: null; loading: boolean; }' is not assignable to type '{ auth: AuthState<any> | null; }'.   Object literal may only specify known properties, and 'error' does not exist in type '{ auth: AuthState<any> | null; }'.

I'm struggling to resolve this typing issue, any suggestions or hints would be greatly appreciated.

typescripttypescript-typings

Answer №1

Give this a shot:

interface AuthenticationState<T = any> {
  auth: T;
  error: null | Error;
  loading: boolean;
}

export const initialState: { auth: null } | AuthenticationState = {
  auth: null,
  error: null, // This is where the error occurred
  loading: false
};

Previously, you specified that auth could be either null or an AuthenticationState. However, I believe what you intended to convey was: initialState can be either { auth: null } or an AuthenticationState.

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