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Using TypeScript with React

Quiz

Explore how to strongly-type React component refs with TypeScript to enhance type safety and code readability in your React applications. This lesson helps you understand the process and benefits of using TypeScript for typing refs effectively.

We'll cover the following...

Creating strongly-typed context

1.

We are implementing a context for authentication. What is wrong with the implementation below and how can this be corrected?

type AuthContextType = {
  isAuthenticated: boolean;
  userName?: string;
  signIn: (userName: string) => void;
  signOut: () => void;
};
const AuthContext = React.createContext(undefined);
A.

Nothing is wrong with this implemenation.

B.

The type of the value for the context will be inferred as any. We can explicitly define the type for the context to create as follows:

const AuthContext = React.createContext<AuthContextType>(undefined);
C.

The type of the value for the context will be inferred as any. We can explicitly define the type for the context to create as follows:

const AuthContext = React.createContext<AuthContextType | undefined>(undefined);
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