graphql-merge

Merge GraphQL queries.

NOTE: This is very much untested in anything else than the simplest scenarios

Transform

query {
  topUsers {
    firstName
    lastName
  }
}

and

query {
  topUsers {
    company
  }
}

Into this:

query {
  topUsers {
    firstName
    lastName
    company
  }
}

Usage

import { parse, print } from 'graphql';
import { merge } from 'graphql-merge';

const queryB = parse('{ users { name address } } }');
const queryA = parse('{ users { favoriteColor } }');

const mergedQuery = merge(queryA, queryB);
console.log(print(mergedQuery));
// { users { name address favoriteColor } }

TODO

• Arguments should be merged when allowed by configuration
  • i.e. users(first: 10) and users(first: 12) should be merged into users(first: 12) given that some configuration contains { joinArgumentNames: ['first'] }
• Rewrite variable names where possible