feat(index): Index module foundation (#9095)

**What**
Index module foundation

Co-authored-by: Carlos R. L. Rodrigues <37986729+carlos-r-l-rodrigues@users.noreply.github.com>

packages/core/modules-sdk/src/utils/gql-get-fields-and-relations.ts

@@ -0,0 +1,43 @@
+import { GraphQLNamedType, GraphQLObjectType, isObjectType } from "graphql"
+
+/**
+ * Generate a list of fields and fields relations for a given type with the requested relations
+ * @param schemaTypeMap
+ * @param typeName
+ * @param relations
+ */
+export function gqlGetFieldsAndRelations(
+  schemaTypeMap: { [key: string]: GraphQLNamedType },
+  typeName: string,
+  relations: string[] = []
+) {
+  const result: string[] = []
+
+  function traverseFields(typeName, prefix = "") {
+    const type = schemaTypeMap[typeName]
+
+    if (!(type instanceof GraphQLObjectType)) {
+      return
+    }
+
+    const fields = type.getFields()
+
+    for (const fieldName in fields) {
+      const field = fields[fieldName]
+      let fieldType = field.type as any
+
+      while (fieldType.ofType) {
+        fieldType = fieldType.ofType
+      }
+
+      if (!isObjectType(fieldType)) {
+        result.push(`${prefix}${fieldName}`)
+      } else if (relations.includes(prefix + fieldName)) {
+        traverseFields(fieldType.name, `${prefix}${fieldName}.`)
+      }
+    }
+  }
+
+  traverseFields(typeName)
+  return result
+}

packages/core/modules-sdk/src/utils/index.ts

@@ -1,3 +1,4 @@
 export * from "./clean-graphql-schema"
 export * from "./graphql-schema-to-fields"
 export * from "./gql-schema-to-types"
+export * from "./gql-get-fields-and-relations"