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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;
}
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