message: GraphQLConfig type should come from types package
diff: import type {ASTNode} from 'graphql/language';
  import type {
  + GraphQLConfig as GraphQLConfigInterface,
  GraphQLFileMetadata,
  GraphQLFileInfo,
  FragmentInfo,
  @@ -64,7 +65,7 @@ export class GraphQLCache {
  this._fragmentDefinitionsCache = new Map();
  }
  - getGraphQLConfig = (): GraphQLConfig => this._graphQLConfig;
  + getGraphQLConfig = (): GraphQLConfigInterface => this._graphQLConfig;
  getFragmentDependencies = async (
  query: string,
  @@ -141,7 +142,7 @@ export class GraphQLCache {
  };
  getFragmentDefinitions = async (
  - graphQLConfig: GraphQLConfig,
  + graphQLConfig: GraphQLConfigInterface,
  appName: ?string,
  ): Promise<Map<string, FragmentInfo>> => {
  // This function may be called from other classes.
  