Dynamic construction of .graphql files as one schema text file to load to makeExecutableSchema

graphql_types_assembler.js

const path = require('path');
const fs = require('fs');
const topLevelQuery = fs.readFileSync(
  path.resolve(__dirname, 'Query.graphql'),
  { encoding: 'UTF-8' }
);

let types = fs
  .readdirSync(__dirname)
  .filter(fileName => {
    return (
      fileName.indexOf('.graphql') > -1 && fileName.indexOf('Query.graphql') < 0
    );
  })
  .map(graphQLFile => {
    return fs.readFileSync(path.resolve(__dirname, graphQLFile), {
      encoding: 'UTF-8'
    });
  })
  .reduce((prevValue, currentValue, currentIndex) => {
    return prevValue.concat(`${currentValue}\r\n`);
  }, '');

module.exports = types.concat(`${topLevelQuery}`);