export * from 'graphql';
import { IntrospectionQuery } from 'graphql';

export namespace GraphQL {
  export interface GraphQLEnvelope<
    T extends IntrospectionQuery | string | string[]
  > {
    url: string;
    data: T;
  }
}

export namespace GraphQL {
  export type Document = GraphQLEnvelope<IntrospectionQuery>;
}

export enum ImporterType {
  GRAPHQL = 'graphql'
}

export type Doc<T extends DocType> = 
...
  : T extends ImporterType.GRAPHQL
  ? GraphQL.Document
...

export class GraphQLImporter extends BaseImporter<ImporterType.GRAPHQL, GraphQL.Document> 

const document: GraphQL.Document  = {
  "url": "https://example.com/graphql",
  "data": {
    "__schema": {
      "description": null,
      "queryType": {
        "name": "Query"
      },
      "mutationType": null,
      "subscriptionType": null,
      types:  [...],
      directives:  [...],
    }
  }
};

const importer = new GraphQLImporter();

const imported = await  importer.import(JSON.stringify(document));

const document: GraphQL.GraphQLEnvelope<string>  = {
          url: 'https://example.com/graphql',
          data: 'type Foo { bar : String!} type Query { foo: Foo }'
        };

const importer = new GraphQLImporter();

const imported = await  importer.import(JSON.stringify(document));

const document: GraphQL.GraphQLEnvelope<string[]>  = {
          url: 'https://example.com/graphql',
         data: ['type Foo { bar : String!}', 'type Query { foo: Foo }']
        };

const importer = new GraphQLImporter();

const imported = await  importer.import(JSON.stringify(document));