Introspect Remote Schema

const { setContext } = require('apollo-link-context')
const { HttpLink } = require('apollo-link-http')
const {
  introspectSchema,
  makeRemoteExecutableSchema,
} = require('graphql-tools')
const fetch = require('node-fetch')

const http = new HttpLink({
  uri: 'http://example.com/api',
  fetch,
})

const link = setContext((request, previousContext) => ({
  headers: {
    Authorization: `Bearer `,
  },
})).concat(http)

const schema = await introspectSchema(link)
const executableSchema = await makeRemoteExecutableSchema({
  schema: schema,
  link,
})

const fullSchema = executableSchema