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authorMinteck <contact@minteck.org>2023-02-23 19:34:56 +0100
committerMinteck <contact@minteck.org>2023-02-23 19:34:56 +0100
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+// @flow strict
+import type { DocumentNode, OperationDefinitionNode } from '../language/ast';
+import { Kind } from '../language/kinds';
+
+/**
+ * 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 == null) {
+ // 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?.value === operationName) {
+ return definition;
+ }
+ }
+ }
+ return operation;
+}