flow like the river

BACK_BACK/node_modules/graphql/utilities/concatAST.js.flow

@@ -0,0 +1,17 @@
+// @flow strict
+import type { DocumentNode } from '../language/ast';
+
+/**
+ * Provided a collection of ASTs, presumably each from different files,
+ * concatenate the ASTs together into batched AST, useful for validating many
+ * GraphQL source files which together represent one conceptual application.
+ */
+export function concatAST(
+  documents: $ReadOnlyArray<DocumentNode>,
+): DocumentNode {
+  let definitions = [];
+  for (const doc of documents) {
+    definitions = definitions.concat(doc.definitions);
+  }
+  return { kind: 'Document', definitions };
+}