Revised: "Mastering the Art of using useLoaderData Properly with Remix V2

It seems that the correct way to type useLoaderData has changed since V2.

export const loader = async () => {
   return json({ messages: [...] })

}

// In component...
const { messages } = useLoaderData<typeof loader>

Prior examples show it typed differently, but now it is declared like this:

export declare function useLoaderData(): unknown;

This change seems critical, yet information about it is lacking. How can we ensure type safety in light of this new declaration? Is there a better method than using an ugly cast with as?

Your insights are appreciated!

Answer №1

After some digging, I finally got to the bottom of it! When I checked my IDE, I saw that it had imported useLoaderData from react-router instead of @remix-run/react as expected. It didn't even prompt me with the right package suggestion, which is why I was completely unaware of the mistake. Thankfully, after revisiting the changelog, I was able to spot the discrepancy!

Answer №2

When using the Remix, it automatically detects the type of loader being used. If you try to return a message without running a type check, an error will be thrown. In VS Code, importing something other than 'message' will result in a warning that the specified key does not exist on the type loader.

Alternatively, you have the option to create an interface:

interface Message {
   message: YOUR_DESIRED_TYPE
}

You can then import and use this interface in your component:

const { message } = useLoaderData<Message>

This approach keeps your code organized and allows for maintaining all route loader types in a single file.

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