restore base schema in cleanAndMergeSchema in case modules define their own schemas

packages/core/modules-sdk/src/medusa-app.ts

@@ -231,8 +231,14 @@ function isMedusaModule(mod) {
 }
 
 function cleanAndMergeSchema(loadedSchema) {
-  const { schema: cleanedSchema, notFound } =
+  const defaultMedusaSchema = `
-    GraphQLUtils.cleanGraphQLSchema(loadedSchema)
+    scalar DateTime
+    scalar JSON
+    directive @enumValue(value: String) on ENUM_VALUE
+  `
+  const { schema: cleanedSchema, notFound } = GraphQLUtils.cleanGraphQLSchema(
+    defaultMedusaSchema + loadedSchema
+  )
   const mergedSchema = GraphQLUtils.mergeTypeDefs(cleanedSchema)
   return {
     schema: GraphQLUtils.makeExecutableSchema({ typeDefs: mergedSchema }),

packages/modules/index/src/utils/base-graphql-schema.ts

@@ -3,5 +3,4 @@ export const baseGraphqlSchema = `
     scalar Date
     scalar Time
     scalar JSON
-    directive @enumValue(value: String) on ENUM_VALUE
 `