build: fetch GQL schema from endpoint

README.md

@@ -128,6 +128,10 @@ Click reload for Sourcegraph at `about:debugging`
   - Download the `ngrok` executable https://dashboard.ngrok.com/get-started, authenticate, and run `./ngrok localhost 3080`
   - Visit the URL it spits out, sign in, and add the URL to your Safari extension (to the left of the address bar - don't change Settings in the Extension Builder)
 
+### Updating GraphQL types
+
+`npm run graphql` fetches the schema from the live GraphQL API and updates app/backend/graphqlschema.ts.
+
 ## Testing
 
 Coming soon...

app/backend/graphql.tsx

@@ -3,10 +3,10 @@ import { IQuery } from '@sourcegraph/extensions-client-common/lib/schema/graphql
 import { Observable, throwError } from 'rxjs'
 import { ajax } from 'rxjs/ajax'
 import { catchError, map } from 'rxjs/operators'
-import { GQL } from '../../types/gqlschema'
 import { isPrivateRepository, repoUrlCache, sourcegraphUrl } from '../util/context'
 import { RequestContext } from './context'
 import { AuthRequiredError, createAuthRequiredError, NoSourcegraphURLError } from './errors'
+import * as GQL from './graphqlschema'
 import { getHeaders } from './headers'
 
 /**