You may have the fortune of being familiar with the jOOQ library for Java/JVM apps, that can generate domain models based on your database schema, as well as methods on these classes to perform queries. In case you're not, here's an example. Based on this Postgres schema,

TABLE User {
    id SERIAL PRIMARY KEY,
    name VARCHAR(30),
    age INTEGER
}

jOOQ would generate classes USER, ID, NAME and AGE, which would be fully type-checked, meaning the methods available on these classes would be based on their respective types in the database, allowing queries such as:

import com.domain.generated.tables.USER;
import com.domain.generated.tables.pojos.User;
import static org.jooq.impl.DSL.select;

List<User> usersAged30NotNamedDave = 
     select(USER.ID, USER.NAME, USER.AGE)
        .from(USER)
        .where(USER.AGE.eq(30))
        .and(USER.NAME.ne("Dave"))
        .fetchInto(User.class);
...

As you can see, this is extremely useful for removing boilerplate, ensuring type-safety, and making sure any query you write will be valid.

I'm hoping there exists a Typescript library that generates typed GraphQL in a similar way to this. None of the ones I've found so far have all these features: as far as I can tell, they mostly seem to generate types based on your server's schema, but then still require you to manually write queries in the form of multiline strings or similar, as opposed to having methods on the generated types that let you perform queries in a jOOQ-like way. Thank you for any help!