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node_modules/graphql/utilities/concatAST.d.ts

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+import { 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;