Update GraphQL schema file

updateSchema.js

#!/usr/bin/env babel-node --optional es7.asyncFunctions

import fs from 'fs';
import path from 'path';

import fetch from 'isomorphic-fetch';
import { introspectionQuery } from 'graphql/utilities';

const url = 'http://localhost:5000';

async function updateSchema() {
  const response = await fetch(url + '/graphql', {
    body: JSON.stringify({
      query: introspectionQuery,
    }),
    headers: {
      'Content-Type': 'application/json',
    },
    method: 'POST',
  });
  const result = await response.json();
  if (response.status < 200 || response.status >= 300) {
    throw new Error(
      `Fetching the schema from '${url}' failed. ${result.error || ''}`
    );
  }
  fs.writeFileSync(
    path.join(__dirname, '../data/schema.json'),
    JSON.stringify(result, null, 2)
  );
}

updateSchema().catch((error) => {
  console.error(error.toString());
  process.exit(1);
});