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node_modules/graphql/validation/rules/ScalarLeafs.mjs

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