N
Nuxt•2mo ago
bnason

Nuxt Server Api response data typing with parameters

Is there any way to get a narrowed down type when calling a GET request with parameters? For instance, If I call useFetch(`/api/user/${userId}`) it'll give me the base object and if I want to include extra data like their posts I would call useFetch(`/api/user/${userId}`, { query: { includePosts: true }) and I want that response to be typed to include the includePosts key and that it exists
2 Replies
kapa.ai
kapa.ai•2mo ago
Hi @bnason. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave: ---------------------- To address your question about narrowing down the type for a GET request with parameters in Nuxt's server API, there are a few approaches we can consider. However, it's important to note that the knowledge sources provided don't contain specific information about automatically narrowing types based on query parameters. Nevertheless, I can offer some insights based on the available information. 1. Type-safe routing: Nuxt has experimental support for type-safe routing, which could potentially help with this scenario. As mentioned in the YouTube video about type-safe routing in Nuxt, there are ongoing efforts to improve type safety in Nuxt. 2. Using transform option: You can use the transform option of useFetch to modify the returned data and potentially narrow down the type. Here's an example based on the Docs > Api > Composables > useFetch source: 
const { data: user } = await useFetch(`/api/user/${userId}`, {
  query: { includePosts: true },
  transform: (response) => {
    // Here you can narrow down the type based on the query parameters
    if (response.includePosts) {
      return {
        ...response,
        posts: response.posts // Assuming the API returns posts when includePosts is true
      };
    }
    return response;
  }
});
const { data: user } = await useFetch(`/api/user/${userId}`, {
  query: { includePosts: true },
  transform: (response) => {
    // Here you can narrow down the type based on the query parameters
    if (response.includePosts) {
      return {
        ...response,
        posts: response.posts // Assuming the API returns posts when includePosts is true
      };
    }
    return response;
  }
});
3. Custom type assertion: You could create a custom type and use type assertion to narrow down the type based on the query parameters: 
type UserResponse = {
  id: number;
  name: string;
  posts?: Post[]; // Optional posts field
};

type UserResponseWithPosts = UserResponse & { posts: Post[] }; // Posts is required

const { data: user } = await useFetch<UserResponseWithPosts>(`/api/user/${userId}`, {
  query: { includePosts: true }
});
type UserResponse = {
  id: number;
  name: string;
  posts?: Post[]; // Optional posts field
};

type UserResponseWithPosts = UserResponse & { posts: Post[] }; // Posts is required

const { data: user } = await useFetch<UserResponseWithPosts>(`/api/user/${userId}`, {
  query: { includePosts: true }
});
4. Server-side type generation: As mentioned in the Docs > Guide > Directory-structure > server > Server Types source, Nuxt provides some type generation for API routes. You might be able to leverage this to create more specific types for your API responses. While these approaches can help improve type safety, they don't automatically narrow the type based on query parameters as you described. To achieve that level of type inference, you might need to implement a custom solution or wait for potential future enhancements to Nuxt's type system. For the most up-to-date information on this topic, I recommend checking the official Nuxt documentation or reaching out to the Nuxt community forums. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------
kapa.ai
kapa.ai•2mo ago
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