How to Properly Pass Props with a Custom Type in Next.js Using TypeScript скачать в хорошем качестве

How to Properly Pass Props with a Custom Type in Next.js Using TypeScript

Learn how to maintain TypeScript typings when passing props in Next.js, ensuring strong typing throughout your application. --- This video is based on the question https://stackoverflow.com/q/74593696/ asked by the user 'Fred' ( https://stackoverflow.com/u/6713072/ ) and on the answer https://stackoverflow.com/a/74593802/ provided by the user 'Amirhossein' ( https://stackoverflow.com/u/11342834/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions. Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Passing prop with custom type, nextJS, typescript Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l... The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license. If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com. --- Understanding Prop Types in Next.js with TypeScript When working with Next.js and TypeScript, it’s common to fetch data from an API and pass it to your page components as props. However, developers often encounter challenges when trying to maintain the correct types for these props, especially when custom types are involved. In this post, we will uncover a common problem related to prop typing and provide a clear solution to ensure your TypeScript types remain intact throughout your application. The Problem Imagine you have an array of JSON data fetched from an API, which you want to assign to a custom type. You define your custom data type like this: [[See Video to Reveal this Text or Code Snippet]] Next, you fetch this data using the getServerSideProps function, which looks something like this: [[See Video to Reveal this Text or Code Snippet]] However, once you pass the data prop to your component, you might run into an error message stating 'Property 'data' does not exist on type '{}'. This confusion arises because TypeScript cannot infer the type of the props, and as a result, it defaults to any, which is not ideal. The Solution To retain the strong typing of your props when passing data from getServerSideProps to your component, follow these steps: Step 1: Specify the Component Prop Types You need to explicitly define the type of the props your component will accept. In our case, the DigitalServices component needs to accept a prop of type Service. You can do this by modifying the component's declaration as follows: [[See Video to Reveal this Text or Code Snippet]] Step 2: Implement the Component Once you have specified the prop types, you can implement the component using the fetched data. Here’s how you might structure your component: [[See Video to Reveal this Text or Code Snippet]] Step 3: Handle Optional Values Since the properties in our Service type are marked as optional (e.g., id?, name?, description?), ensure that you handle these cases appropriately in your component to avoid runtime errors. Conclusion Type safety is one of the significant advantages of using TypeScript, especially in a framework like Next.js. By properly typing your props, you can avoid common pitfalls and ensure a more robust application. In this post, we explored a common issue related to prop types and shared a straightforward solution to maintain strong typing when working with Next.js and TypeScript. With this approach, you can confidently pass props without losing the benefits of type safety. Happy coding!