What are type guards in React with TypeScript?

What are type guards in React with TypeScript?

Type guards are functions that help TypeScript determine the type of a variable at runtime, enhancing type safety.

Can you give me an example of a type guard?

Sure! Here's a simple example:

function isString(value: any): value is string {
    return typeof value === 'string';
}

This function checks if a value is a string.

How do I use type guards in a React component?

You can use type guards to ensure props are of the expected type. For example:

function MyComponent(props: { name: string | number }) {
    if (isString(props.name)) {
        return <div>Name: {props.name}</div>;
    }
    return <div>Number: {props.name}</div>;
}

Are there built-in type guards in TypeScript?

Yes, TypeScript has built-in type guards like typeof and instanceof that you can use to check types.