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Intense drum arrangements, distorted bass lines and warm synth melodies mark the aesthetic of Foreign's debut ep on Eye For An Eye Recordings. Unlike the producer's previous techno-oriented releases on Cologne based BAROC, 'Redemption' reveals a punk approach regarding his ways of crafting music. From the non-conformist 'Ignorance Amongst Us', to the hopeful 'Hope' theme, 'Redemption' is a non-spoken manifest to a society on the verge of colapse.
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Eye For An Eye explores non conformist electronic music that strives to push the boundaries of genres and practices.

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Cool right?;)

Default Props

Let’s extend our Button component with an color prop of type string.

If we wanna define defaultProps we can do it via on our component.

By doing that we need to change our Props type definition to mark props that are default as optional.

So something like this ( notice the operator )

and our Component looks like this:

While this works for this simple example, there is one gotcha. Because we are in strict mode, optional props are union of type for our .

Let’s say we would like to do something with that particular prop, TS would throw an error because it doesn’t know, that it is defined by React construct.

To satisfy TS compiler we can use 3 techniques:

We can implement our High order function very easily ( thanks to new TS 2.8 conditional predefined mapped types ):

Now we can use our High order function to define our default props, this will also solve our previous problem:

Or directly inline ( note that we need to explicitly provide original Button Props type, as TS is not able to infer argument types from function):

And usage remains the same:

And yes this works also for Components defined via ( also note, that thanks to structural origin of classes in TS, we don't have to specify explicitly our generic type).

It looks like this:

And again usage remains the same:

Bang operator conditional statements/ternary operator withDefaultProps

Let’s say you need to build an expandable menu component that shows some children content when user clicks on it. We will implement this behaviour via various React Component Patterns.

Render Callbacks/Render Propspattern

The best way to make a component logic reusable is by turning your component children into a function or leveraging prop API — that’s why Render Callbacks are also called Function as Child Components.

Let’s implement a component with render props functionality:

Now we need to define our component props ( note that we are using Partial mapped type, as we know that all props are gonna be optional, instead of annotating every prop manually by operator ):

We wanna support both function as a child and render prop function, so both need to be optional. To makes things , we’re creating type of our render function definition:

Again we are using the power of typescript and , so we don’t have to repeat ourselves when defining types:

The rest of the implementation is straightforward, standard pattern:

Now we can pass a function as children to Toggleable component:

or we can pass a function to render prop:

Thanks to Typescript we got also intellisense at our disposal and proper type checking of our render prop arguments:

If we want to reuse it (for multiple menus or so), we could simply create a new component that uses Toggleable logic:

Our brand new component is ready to be used within Menu component:

And it works as expected:

Component Injection

To make our component even more flexible, we can introduce Component Injection pattern.

What is Component Injection pattern? If you’re familiar with React-Router, you are using this pattern when defining route definition via:

So instead of passing a function via render/children props, we are “injecting” Component via prop. For this to work, we can refactor our inline render prop function to a reusable stateless component:

With that we can refactor our with render prop to:

Now with that done, let’s define our new API —  prop.

We need update our props API.

Next we need to add new props API to our , so consumer will be allowed to use prop on :

Now we need to update our method

Whole implementation of Toogleable component with Render Props, Children as a Function, Component Injection with arbitrary props support:

Our final component which leverages prop looks like this:

NOTE though, that we have no type safety within our arbitrary custom prop, because it's defined as indexed object map

We can now use our for menu rendering as before

Generic Components

When we implemented “component injection pattern” we lost strict type safety on arbitrary props handled via . How can we fixes this? You guess it right! We can write our component as a generic Components!

First we need to make our props generic. We are using default generic parameters so we don’t have to provide it explicitly when we don’t want to ( for render props/children as a function).

We also need to update our to be generic. Oh wait it already is;). So no changes on this front.

What needs to be changed though is definition of as it is impossible to get generic type definition from implementation, we need to refactor it to old fashioned way type definition -> implementaion

Now let’s make our component class generic. Again we are using default props so we don’t have to specify generic arguments when component injection is not used!

That’s it! That’s it??? Hmm, how can we leverage this generic type within our JSX?

Bad news, we can’t…

We need to introduce generic component factory pattern

Whole implementation of Toogleable component with Render Props, Children as a Function, Component Injection with generic props support:

Now with factory method, we can create our properly typed generic component

And everything will work as before, this time with proper type safety for our prop. High five!

High Order Components

Because we already created our component with render callback functionality, implementing HOC will be easy peasy. ( That's also one of the great advantages of render callback pattern, we can leverage it for HOC implementation)

We need to create:

Now we can create our Toogleable menu item via HOC as well, with correct type safety of props!

Controlled Components

We are in the finale! Let’s say we wanna make our highly configurable by controlling it from parent. This is very powerful pattern indeed. Let's do this.

What I mean by Controlled Component? I wanna controll if content is shown directly for all my components from within component.

We need to update our implementation of ToggleableMenu components like following:

Now with those updated we can add state to our and propagate it down to

L et’s update our one last time for ultimate power and flexibility

To make our Toggleable controlled component we need to do following:

1 2:

3 4:

Final Toggleable Component with support for all patterns ( Render Props/Children as Function/Component Injection/Generic types/Controllable )

Final withToggleable HoC via Toggleable

Just slight update -> we need to propagate prop value within our HoC and update our API


Implementing proper type safe components with React and Typescript can be tricky. With new functionality added to Typescript 2.8, we have almost everything at our disposal to write type safe components by adhering to common React component patterns.

In this super long post ( sorry about that!) we learned how to implement components with various patterns in strict type safe way thanks to Typescript.

Most powerfull pattern overall is indeed Render Props, which allows us to implement other common patterns like Component Injection or HOC without much additional churn.

All demos can be found at my Github repo for this post.

Also it is very important to realise, that type safety within templates like demonstrated in this article, is possible only within libraries that use VDOM/JSX

As always ping me here or on twitter( my handle @martin_hotell ) if you have any questions, beside that, happy type checking folks! Cheers!

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