Here is how my type definition looks:
export type AuthType = boolean | { roles: string[]; assistant?: string[] } | (() => void);Now, I need to check the type of the auth variable and assign a value or execute a function in this line of code:
req.allowed = auth === true ? this.allowed : auth.roles ? auth : auth();Although the code functions correctly (executed only when auth is not false or null), my IDE (WebStorm) displays an error message:
Make sure to check if auth is an object before attempting to access the roles property in TypeScript. By using the optional chaining operator, you can prevent potential issues with accessing properties on a function that might not exist:
req.allowed = auth === true ? this.allowed : auth?.roles ? auth : auth();
With auth?.roles, the evaluation will return undefined if auth happens to be a function.
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