[Feature Request]: automatic type resolvers from graphql tags

[EloB]

AFAIK Typescript doesn't have the possibilities to infer the TemplateStringsArray that prevents automatic type resolving.

It seems like an hard issue for TypeScript to solve. The request has been around since 2019:
microsoft/TypeScript#33304

I was thinking if we could create an alternative to:

type CurrentGraphQLFn = (texts: TemplateStringsArray): GraphQLTaggedNode;

graphql`
  query something {
    // ....
  }
`

To something like this:

type GraphQLQuery<T extends string> = T extends keyof RelayPersistentQueries
  ? RelayPersistentQueries[T]
  : GraphQLTaggedNode;

type FeatureRequestGraphQLFn = <T extends string>(query: T): GraphQLQuery<T>;

// $graphql would be a new function from relay and keep the other one untouched for backward compatibility.
const query = $graphql(`
  query something {
    // ...
  }
`)

If the compiler creates a type definition file with all queries like Record<string, OperationType> as the RelayPersistentQueries we would be able to automatically type queries.

This is good either way because if they manage to add the inferring feature to Typescript than we already have this functionality and would be easy to add to our graphql function as well. Then we only deprecate that $graphql function because I can agree that template literals looks better.