# babel-check-duplicated-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's codebase](https://github.com/babel/babel/blob/d383659ca6adec54b6054f77cdaa16da88e8a171/packages/babel-helper-transform-fixture-test-runner/src/index.js#L128). ## API ```js checkDuplicatedNodes(babel, ast) ```
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