merge-schemas.js

import graphqlTools from 'graphql-tools';
import serverOneFetcher from './server-fetcher-one';
import serverTwoFetcher from './server-fetcher-two';
import SchemaBuilder from './schema-builder';
import serviceStitching from './stitching-service';
import linkServiceCategorySchema from './link-service-with-category';

const schemas = [];
const fetchers = {
  serverOne: serverOneFetcher,
  serverTwo: serverTwoFetcher,
};

export default async () => {
  try {
    await Promise.all(
      Object.values(fetchers).map(async (fetcher) => {
        schemas.push(await SchemaBuilder(fetcher));
      }),
    );

    schemas.push(linkServiceCategorySchema);

    return graphqlTools.mergeSchemas({
      schemas,
      resolvers: mergeInfo => serviceStitching(mergeInfo),
    });
  } catch (error) {
    console.log('error:', error);
    return error;
  }
};