Infer nested type of trpc router return type

I have a tRPC router than returns a nested object through a db query. It looks like this:

ILessonCommentProps.comments: ({
    _count: {
        likes: number;
        comments: number;
        bookmarks: number;
    };
    comments: ({
        user: GetResult<{
            id: string;
            displayName: string | null;
            email: string | null;
            emailVerified: Date | null;
            ... 17 more ...;
            updatedAt: Date;
        }, unknown>;
        subComments: GetResult<...>[];
    } & GetResult<...>)[];
    bookmarks: {
        ...;
    }[];
    likes: {
        ...;
    }[];
} & GetResult<...>) | null

ILessonCommentProps.comments: ({
    _count: {
        likes: number;
        comments: number;
        bookmarks: number;
    };
    comments: ({
        user: GetResult<{
            id: string;
            displayName: string | null;
            email: string | null;
            emailVerified: Date | null;
            ... 17 more ...;
            updatedAt: Date;
        }, unknown>;
        subComments: GetResult<...>[];
    } & GetResult<...>)[];
    bookmarks: {
        ...;
    }[];
    likes: {
        ...;
    }[];
} & GetResult<...>) | null

I'd like to infer the type of the comments property to use as an interface for props on a component. I tried doing this but this doesn't work:

interface ILessonCommentProps {
  comments: AppRouterOutputs['lessonBuilder']['getLessonLikesCommentsBookmarks']['comments'];
}

interface ILessonCommentProps {
  comments: AppRouterOutputs['lessonBuilder']['getLessonLikesCommentsBookmarks']['comments'];
}

I was wondering if this is even possible?

2 Replies

delavalom•2y ago

I believe you need to infer the output of the router. So this should help you https://trpc.io/docs/client/infer-types#inferring-input--output-types

Inferring Types | tRPC

It is often useful to access the types of your API within your clients. For this purpose, you are able to infer the types contained in your AppRouter.

sanya_jain•12mo ago

This document does not answer the question posted, I am also stuck at this

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Infer nested type of trpc router return type