react function component typescript

We use as little TypeScript as possible.

Eight months later, after diving deeper into TypeScript, I’ve finally learned the difference and understand why my first attempt didn’t work.When we type a React component as a function expression (i.e. you will get an error if you don’t provide any typings yourself.

Converting a React function component to TypeScript The project I'm currently working on is running on TypeScript. function MyComponent), we ask the same thing. You already get nice suggestions in VS Code:And errors when you compile without passing all required properties:If you want to make some properties optional, do that in the respective Props type:My personal prefered way of using functional components in TypeScript is by using the generic type provided by the official typings:The parameters of our function are infered from the generic FunctionComponent. However, you should be careful when applying this pattern, because maybe you can solve the problem a different way. ... Toggle component with children as a function usage within App Instead of investigating deeper, I decided to stick with what worked (using function expressions like the first example).

This is the type of the fields stored in the form, and is passed to both the Props and State types as their own generic parameters. Note: Function Components were formerly known as Stateless Function Components (SFC). Just mentioning it here for curious reader One more thing. The first thing to notice is that the Form component has a TypeScript generic parameter named FormFields. with a completly new constructor, and TypeScript does not know which parameters to expect!Default properties allow you to specifcy default values for properties.

They are simple, purely functional and super easy to reason about.The following shows an example of a functional component with some typed properties. In the other instance, when we type a React component as a function declaration (i.e. Here’s an example:We can do the same thing with a function declaration:Joe lives in sunny Scottsdale, Arizona. However, it allows for optional child components:One of the things that convinced me to use React were functional components. Just like React class components, whether the component has a state or not is still up to us. ... A functional component is more strict than React.ReactNode allows. Using React.FC is more verbose, but does have some added benefits:. 3-4 updates per month, spam-free, hand-crafted. In this article we will cover various patterns how to leverage children composition with TypeScript to get excellent developer experience and type-safety along the process.Let’s say that we have an application with a header and we want to place a navigation inside. Now, TypeScript knows that this function will return some type of These are all the valid things that can be returned by a component. Function components can no longer be considered stateless with the introduction of hooks. Even if you have more

it seems very similar to the first example. But what if user forgets to provide children ?Well, we’ll get no compile nor runtime errors and our app will render with empty Card …This is definitely not what we wanted. You need to pass your props there (even if you don’t have any), Whether you're coming in fresh to using Typescript with React or are a grizzled veteran looking to add more functional components to your codebase by introducing hooks, ... Another way to define props is to import and use React's Functional Component type, FC for short. If you would like to revisit the basics of generics first, check out TypeScript Generics. everything we need. State is like props, but private and only 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 = { [P in Exclude]?

To access the React-provided prop children in a functional component, you can opt to use the React.FunctionComponent type annotation: Here we see That’s a lot of tooling support, just for a couple of keystrokes more. It should be already covered right? Pure React Function Component.

to have every value to be set explicitly. Stateless functional components are an awesome way to decouple complex architecture from the design of a component's output. Inside our React component, you will notice a special static defaultProps property that allows us to tell TypeScript what props are not required and have a default set. 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.

We have three React components — App, Header and Navigation.

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