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venv/lib/python3.9/site-packages/graphql/utilities/concat_ast.py

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+from itertools import chain
+from typing import Collection
+
+from ..language.ast import DocumentNode
+
+__all__ = ["concat_ast"]
+
+
+def concat_ast(asts: Collection[DocumentNode]) -> DocumentNode:
+    """Concat ASTs.
+
+    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.
+    """
+    return DocumentNode(
+        definitions=list(chain.from_iterable(document.definitions for document in asts))
+    )