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node_modules/graphql/utilities/concatAST.js.flow

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+// @flow strict
+
+import flatMap from '../polyfills/flatMap';
+
+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(asts: $ReadOnlyArray<DocumentNode>): DocumentNode {
+  return {
+    kind: 'Document',
+    definitions: flatMap(asts, ast => ast.definitions),
+  };
+}