flow like the river

VISUALIZACION/node_modules/graphql/validation/rules/ScalarLeafsRule.mjs

@@ -0,0 +1,34 @@
+import inspect from "../../jsutils/inspect.mjs";
+import { GraphQLError } from "../../error/GraphQLError.mjs";
+import { getNamedType, isLeafType } from "../../type/definition.mjs";
+
+/**
+ * Scalar leafs
+ *
+ * A GraphQL document is valid only if all leaf fields (fields without
+ * sub selections) are of scalar or enum types.
+ */
+export function ScalarLeafsRule(context) {
+  return {
+    Field: function Field(node) {
+      var type = context.getType();
+      var selectionSet = node.selectionSet;
+
+      if (type) {
+        if (isLeafType(getNamedType(type))) {
+          if (selectionSet) {
+            var fieldName = node.name.value;
+            var typeStr = inspect(type);
+            context.reportError(new GraphQLError("Field \"".concat(fieldName, "\" must not have a selection since type \"").concat(typeStr, "\" has no subfields."), selectionSet));
+          }
+        } else if (!selectionSet) {
+          var _fieldName = node.name.value;
+
+          var _typeStr = inspect(type);
+
+          context.reportError(new GraphQLError("Field \"".concat(_fieldName, "\" of type \"").concat(_typeStr, "\" must have a selection of subfields. Did you mean \"").concat(_fieldName, " { ... }\"?"), node));
+        }
+      }
+    }
+  };
+}