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node_modules/graphql/validation/rules/ExecutableDefinitions.js.flow

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+// @flow strict
+
+import { GraphQLError } from '../../error/GraphQLError';
+
+import { Kind } from '../../language/kinds';
+import { type ASTVisitor } from '../../language/visitor';
+import { isExecutableDefinitionNode } from '../../language/predicates';
+
+import { type ASTValidationContext } from '../ValidationContext';
+
+export function nonExecutableDefinitionMessage(defName: string): string {
+  return `The ${defName} definition is not executable.`;
+}
+
+/**
+ * Executable definitions
+ *
+ * A GraphQL document is only valid for execution if all definitions are either
+ * operation or fragment definitions.
+ */
+export function ExecutableDefinitions(
+  context: ASTValidationContext,
+): ASTVisitor {
+  return {
+    Document(node) {
+      for (const definition of node.definitions) {
+        if (!isExecutableDefinitionNode(definition)) {
+          context.reportError(
+            new GraphQLError(
+              nonExecutableDefinitionMessage(
+                definition.kind === Kind.SCHEMA_DEFINITION ||
+                  definition.kind === Kind.SCHEMA_EXTENSION
+                  ? 'schema'
+                  : definition.name.value,
+              ),
+              definition,
+            ),
+          );
+        }
+      }
+      return false;
+    },
+  };
+}