Why am I required to return a field in this resolver?

[vedantroy]

I have the following snippet in my graphql schema:

type Cost {
    id: ID!
    multiplier: Float!
}

type Fruit {
    id: ID!
    cost: Cost
}

In my resolvers object, I have the following:

Fruit: {
	cost: async (parent, args, context, info) => {
		return { id: parent.id }
	},
}

However, Typescript complains and says I also need to include the multiplier field in the returned object. On one hand this makes b/c multiplier is required. But I'm also confused, shouldn't graphql go look for a Cost object and then use a resolver there instead?

[dotansimha]

By default, codegen generates a signature that requires you to return what the schema exposes. So if the field is non-nullable, you'll have to return it.
If you want to customize that, you can use mappers, take a look at this: https://the-guild.dev/blog/better-type-safety-for-resolvers-with-graphql-codegen