getOperationAST
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.
function getOperationAST(documentAST: DocumentNode, operationName?: Maybe<string>): Maybe<OperationDefinitionNode>;
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getOperationAST(documentAST: DocumentNode, operationName?: Maybe<string>): Maybe<OperationDefinitionNode>
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