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node_modules/graphql/utilities/getOperationAST.js.flow

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+// @flow strict
+
+import { Kind } from '../language/kinds';
+import {
+  type DocumentNode,
+  type OperationDefinitionNode,
+} from '../language/ast';
+
+/**
+ * Returns an operation AST given a document AST and optionally an operation
+ * name. If a name is not provided, an operation is only returned if only one is
+ * provided in the document.
+ */
+export function getOperationAST(
+  documentAST: DocumentNode,
+  operationName: ?string,
+): ?OperationDefinitionNode {
+  let operation = null;
+  for (const definition of documentAST.definitions) {
+    if (definition.kind === Kind.OPERATION_DEFINITION) {
+      if (!operationName) {
+        // If no operation name was provided, only return an Operation if there
+        // is one defined in the document. Upon encountering the second, return
+        // null.
+        if (operation) {
+          return null;
+        }
+        operation = definition;
+      } else if (definition.name && definition.name.value === operationName) {
+        return definition;
+      }
+    }
+  }
+  return operation;
+}