fix: check if subgraph is version 2 before generating type defs

Author: greguintow

packages/graphql/lib/federation/graphql-federation.factory.ts

@@ -94,7 +94,13 @@ export class GraphQLFederationFactory {
       'ApolloFederation',
       () => require('@apollo/subgraph'),
     );
+    const apolloSubgraphVersion = loadPackage(
+      '@apollo/subgraph',
+      'ApolloFederation',
+      () => require('@apollo/subgraph/package.json'),
+    );
 
+    const isaApolloSubgraph2 = Number(apolloSubgraphVersion.split('.')[0]) >= 2;
     const printSubgraphSchema = apolloSubgraph.printSubgraphSchema;
 
     if (!buildFederatedSchema) {
@@ -106,7 +112,9 @@ export class GraphQLFederationFactory {
       options,
       this.resolversExplorerService.getAllCtors(),
     );
-    let typeDefs = printSchemaWithDirectives(autoGeneratedSchema);
+    let typeDefs = isaApolloSubgraph2
+      ? printSchemaWithDirectives(autoGeneratedSchema)
+      : printSubgraphSchema(autoGeneratedSchema);
     if (options.useFed2) {
       const {
         directives = [