updateSchema.js

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

import fs from 'fs'
import path from 'path'
import { Schema } from '../data/schema.js'
import { graphql } from 'graphql'
import { introspectionQuery, printSchema } from 'graphql/utilities'

(async () => {
  let result = await (graphql(Schema, introspectionQuery))
  if(result.errors) {
    console.error(
      'ERROR introspecting schema: ',
      JSON.stringify(result.errors, null, 2)
    )
  } else {
    fs.writeFileSync(
      path.join(__dirname, '../data/schema.json'),
      JSON.stringify(result, null, 2)
    )
  }
})()

fs.writeFileSync(
  path.join(__dirname, '../data/schema.graphql'),
  printSchema(Schema)
)