How to Properly Type Props in a React TypeScript Component

Learn the right way to type props in a React TypeScript component to avoid common errors and improve your code quality.
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Understanding Props Typing in React TypeScript

When working with React and TypeScript, you may encounter instances where your application throws errors related to prop types. This situation can be frustrating, especially when you're just trying to render a simple component. In this guide, we will address a common issue faced when typing props in React TypeScript and guide you through the solution step by step.

The Problem: Type Mismatch in Props

Let’s consider an example where you have a React component designed to display results. The initial code structure may look like this:

[[See Video to Reveal this Text or Code Snippet]]

While this seems fine, attempting to use the ResultsSection component in another component leads to an error:

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The Error

When trying to render ResultsSection, you might see an error message stating:

[[See Video to Reveal this Text or Code Snippet]]

This error occurs because TypeScript does not recognize data as a valid prop for the ResultsSection component.

The Solution: Correctly Typing the Props

To resolve this issue, you need to properly define the prop types in your ResultsSection component. Here’s how to do it step by step:

Step 1: Define Prop Interfaces

Instead of accepting the props as a plain argument, you should define an interface that describes the shape of the props. For your scenario, create an interface for the props like this:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Destructure the Props

Next, update the ResultsSection function to destructure the incoming props. This helps TypeScript understand what you are expecting. Your component should look like this:

[[See Video to Reveal this Text or Code Snippet]]

Full Corrected Example

Here is the complete corrected version of your components:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By defining an interface for your props and destructuring them in the function signature, you can effectively avoid type errors and leverage TypeScript’s capability for type safety. This makes your code cleaner and helps you catch potential issues during development.

Now, the ResultsSection can properly receive props, and the error you encountered should be resolved. Remember, typing props correctly in React TypeScript is essential for writing robust applications. Happy coding!