Is it possible to utilize a TypeScript type in conjunction with io-ts?

Currently, I am in the process of validating API responses with io-ts.

In my TypeScript setup, I have already defined the following data structure:

export type Group = {
   id: number;
   name: string;
}

Now, my objective is to incorporate this type into io-ts as shown below:

const UploadedSearch = t.type({
    id: t.number,
    title: t.string,
    groups: t.array(Group),
});

However, upon attempting to do so, I encountered the following error message.

TS2693: 'Group' only refers to a type, but is being used as a value here.

Would it be possible to utilize the Group type within the io-ts syntax?

typescripttypesio-ts-library

Answer №1

Although it was mentioned in a previous comment on your post, I want to further demonstrate the use of io-ts to prevent redundancy. Here is an example:

const UserCodec = t.type({
   userId: t.number,
   userName: t.string,
});
// This will represent the structure of a user, avoiding repetition.
export type User = t.TypeOf<typeof UserCodec>;

const PostData = t.type({
   postId: t.number,
   title: t.string,
   author: UserCodec,
});

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