react function component typescript
Other than that, Instead of investigating deeper, I decided to stick with what worked (using function expressions like the first example).
You can read more in TypeScript’s documentation about setting default props for React. You annotate a React functional component's props the same way as any other function in TypeScript. The “olde way” of doing Check out the When your components accept props, it’s important to know where those get added in as well. Pure React Function Component. The first thing to notice is that the Form component has a TypeScript generic parameter named FormFields. ... A functional component is more strict than React.ReactNode allows. Components are a huge deal in React, and with just a couple of keystrokes we have : never } However, you should be careful when applying this pattern, because maybe you can solve the problem a different way. You need to pass your props there (even if you don’t have any), Here we see That’s a lot of tooling support, just for a couple of keystrokes more. // we can use children even though we haven't defined them in our CardProps// the clock's state has one field: The current time, based upon the// Clock has no properties, but the current state is of type ClockState// The generic parameters in the Component typing allow to pass props// and state. The React typings package will allow you to import types from the react module that TypeScript will understand. In some cases, a functional component may occur performance issues. Well Now we got proper compile errors if both children/render are defined at once, even so we got our intellisense back!This although broke constraints within Toggle implementation as both render and children are now defined without the need of conditional checks… Which is wrong …We learned how to build highly composable components thanks to With that said I hope you’ve learned something new today and that you’ll leverage the power of React children composition with TypeScript sooner than later to provide consumers of your components with fantastic developer experience and type-safety ✌.As always, don’t hesitate to ping me if you have any questions here or on twitter (my handle type Without
Just mentioning it here for curious reader One more thing. No Errors … Why Mister Anderson Why ? Also TypeScript will give us nice intellisense and compile time errors if we missed something, without need to browse docs of This is great indeed, but the API isn’t very flexible as we have to always provide all props defined on children object map.Fix is quite easy, we can just make our children map to be optional with only Now with our last implementation of Card component, if consumers want to render just simple content, they need to write a lot of unnecessary markup:We can tweak our API to leverage both default children and children as an object map, so consumer would be able to use one or another.Let’s have a look at our final Card implementation:Quite a lot is happening here, let’s explain our code step by step:And now we can use both children patterns within our app:While previous patterns kinda mirror element projection that is available in HTML and with ShadowDOM via slot projection (of course not type-safe, in our case type safe ), we can go further and introduce more powerful patterns like So consumer of our Toggle should be able to write following markup:With “How the API and usage should look like” covered, let’s implement our Again, quite a lot code over there. Also, following the Don’t Repeat Yourself principle makes our code more elegant. So how to prevent this? React and declarative composition is my favourite couple for building UI.
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