# @babel/helper-check-duplicate-nodes Duplicated AST nodes often lead to obscure bugs. This module checks your AST and throws a helpful error if you include a duplicated node in your output. It's useful when authoring babel transforms. This piece of code was originally written by @nicolo-ribaudo and is included in [@babel/helper-transform-fixture-test-runnner](https://github.com/babel/babel/blob/d383659ca6adec54b6054f77cdaa16da88e8a171/packages/babel-helper-transform-fixture-test-runner/src/index.js#L128). ## API ```js import checkDuplicateNodes from "@babel/helper-check-duplicate-nodes"; checkDuplicateNodes(ast); ```
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