What is the most effective way to structure a React function incorporating nested objects and mapping?

As a newcomer to Typescript, I am facing challenges in properly typing the following code snippet. I have experimented with Interfaces and individually typing properties as well, but it seems like I am only scratching the surface and encountering new typing errors.

I believe one of the main issues lies in typing the map function and the nested objects/values within it. What is the best approach to tackle this?

export function Navigation( { navigation } ) {

    return (
      <nav>
        <ul>
      
          {navigation.data.slices.map( ( slice ) => {
            return (
              <li key={slice.id}>
                <PrismicLink field={slice.primary.menu_item_link}>
                  {slice.primary.menu_item_label}
                </PrismicLink>
              </li>
            )
          })}
        </ul>
      </nav>
    )

}

Answer №1

In order to properly define the types for the objects in your props, such as 'data', the elements in the 'slices' array, and the properties of their 'primary' property, you will need object types created through the use of 'type' or 'interface'. Here is an example:

interface Something {
    menu_item_link: string;
    menu_item_label: string;
}
interface Slice {
    id: string; // This can also be a number or any other type
    primary: Something;
}
interface NavigationData {
    slices: Slice[];
}

This means that your props interface should have an object with a 'navigation' property:

interface NavigationProps {
    navigation: {
        data: NavigationData;
    };
}

To utilize this, specify the type of props your function accepts:

export function Navigation({ navigation }: NavigationProps) {
// Your code here...
}

It's worth noting that the structuring of the object types above is subjective and may vary based on individual preferences and knowledge of the domain. While it's possible to define everything using just 'NavigationProps', it may not be the most optimal approach (example).

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