Add join__FieldSet, link__Import, link__Purpose to stripFederationFromSupergraph (#15)

Closes #14

Author: kamilkisiela

.changeset/old-mirrors-happen.md

@@ -0,0 +1,5 @@
+---
+'@theguild/federation-composition': patch
+---
+
+Add join**FieldSet, link**Import, link\_\_Purpose to stripFederationFromSupergraph

src/graphql/helpers.ts

@@ -15,14 +15,22 @@ export function stripFederationFromSupergraph(supergraph: DocumentNode) {
     SchemaDefinition: remove,
     SchemaExtension: remove,
     EnumTypeDefinition: node => {
-      if (node.name.value === 'core__Purpose' || node.name.value === 'join__Graph') {
+      if (
+        node.name.value === 'core__Purpose' ||
+        node.name.value === 'join__Graph' ||
+        node.name.value === 'link__Purpose'
+      ) {
         return null;
       }
 
       return node;
     },
     ScalarTypeDefinition: node => {
-      if (node.name.value === '_FieldSet') {
+      if (
+        node.name.value === '_FieldSet' ||
+        node.name.value === 'link__Import' ||
+        node.name.value === 'join__FieldSet'
+      ) {
         return null;
       }