[Modern] Query only the local client extension types will cause compiling error

Let's say I declare the client schema extensions

client.graphql
``` graphql
type Token {
accessToken: String
refreshToken: String
}

extend type Query {
token: Token
}
```

And then in the QueryRenderer I made the query like this

```graphql
query RootQuery {
token {
accessToken
refreshToken
}
}
```

The `relay-compiler` will fire the error
```
GraphQLCompilerContext: Unknown document `RootQuery`.
```

My temporary workaround is adding extra fields that can be fetched from remote.
```graphql
query RootQuery {
viewer {
me {
id
}
}
token {
accessToken
refreshToken
}
}
```

In this way, compiler can successfully compile the static query.

My assumption is `relay-compiler` will remove whatever client extensions from the query string, if I only query the local type, the query string will be stripped out entirely.

My question is "Is it possible for relay to query **ONLY** the local type?" People like me are excited about the client extensions is because it gives a way to get rid of the redux store. It will be really helpful if we can directly query the local type and use commitLocalUpdate for the state management.