Support NodeJS ES Modules

[dandv]

I'm trying to use named imports from .mjs files now that modules are no longer experimental and running into the same issue that graphql-tools had:

gm.mjs

import { GraphQLModule } from '@graphql-modules/core';

$ node gm.mjs 
(node:27782) ExperimentalWarning: The ESM module loader is experimental.
file:///home/dandv/gm.mjs:1
import { GraphQLModule } from '@graphql-modules/core';
         ^^^^^^^^^^^^^
SyntaxError: The requested module '@graphql-modules/core' does not provide an export named 'GraphQLModule'

[ardatan]

Currently we don't have Node's ESM support in GraphQL Modules. But we are working on it together with all other libraries we maintain.

[Urigo]

@dandv if you want to help push this forward quicker, the best place to start is making graphql.js compatible with it.
Here is a start: graphql/graphql-js#2487