Depending on which you used determines how you extend the component props. Save my name, email, and website in this browser for the next time I comment. We’ve put together the best practices along with examples to clarify any doubts you may have. Alternatively, an interface could be used to define Props.. Notice that children isn’t defined in Props.Instead, it is already defined in the FC type. like before. We’ve researched the most common questions and put together this handy list of the most common use cases for React with TypeScript. To understand why, think about an “administrative” versus “normal” system user viewing the same data. FC is a generic type that takes in the specific type for all the component props. FC stands for Function Component, and it aliases a type called FunctionComponent. ReactNode is a more terse option: ReactNode allows multiple elements, strings, numbers, fragments, portals, …. Make sure this is always the last configuration in the extends array. Another fantastic resource is the TypeScript Handbook. If we are using function components with the FC type, the children prop is already typed. Fill out this form and we’ll get back to you within two business days. Farther down the line, the buttons and actions that need the dynamic links could access the high-level state through the useContext hook. Notify me of followup comments via e-mail. It gets even worse if you’re using TypeScript (or PropTypes). By commenting, you agree to the terms and conditions outlined in our Privacy Policy. Most of the time, they can go under devDependencies if you’re building a web application. Your email address will not be published. To be a bit more specific in your code you can import SyntheticEvent from the React typings. Our app has several user experiences which render different versions of the same “page” components. The children prop takes a React.ReactNode because it accepts everything that’s a valid return value of a component (read more here). As functional components are stateless, we don't have to provide an empty shape for the state, because there is no state. I’m going to compile it and make sure you didn’t miss anything.”React: “Sounds good to me!”. So all we have to do is to set the type of the parameter props to our TodoItemProps type. First, we define a TodoItem class and extended it from React.Component. In the first example, we’re writing our function as a function declaration. It fits well with React’s top-down data model, and it requires little digging through a complex codebase to understand where data originates. To handle these contextual links, our team created a “dynamic link provider” component. If we want to make this optional for the consumer of the component, we put a question mark(?) When props are optional, handle appropriately or use default values. We will revisit this issue later in this article. Note: to read more about React.FC, look here, and read here for React.ReactNode. after the prop named color indicates that it’s optional. Create a .eslintrc.js file at the root and add the following: Create a .prettierrc.js file at the root and add the following: These recommendations come from a community resource written called “Using ESLint and Prettier in a TypeScript Project”, by Robert Cooper. Learn how Git works, and how to use it to streamline your workflow! In contrast, the second example uses a function expression. React is a “JavaScript library for building user interfaces”, while TypeScript is a “typed superset of JavaScript that compiles to plain JavaScript.” By using them together, we essentially build our UIs using a typed version of JavaScript. Here is a nice way to create a React Input component using typescript! One of the most common cases is correctly typing the onChange used on an input field in a form. Instead of having to declare each one we can just use a spread attribute ...rest, Original post: https://giselamirandadifini.com/creating-a-react-input-component-in-typescript, Follow me on Dev.to: https://dev.to/giselamd, https://developer.mozilla.org/en-US/docs/Web/API/HTMLInputElement, https://giselamirandadifini.com/creating-a-react-input-component-in-typescript, The differences between JavaScript’s asynchronous API timers, How to Maximize Reusability for Your React Components, Dynamic Component Templates with Vue.js.