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Original file line number | Diff line number | Diff line change |
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--- | ||
title: "TypeError: context.getScope is not a function" | ||
eleventyNavigation: | ||
key: v9 rule api changes | ||
parent: troubleshooting | ||
title: "TypeError: context.getScope is not a function" | ||
--- | ||
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## Symptoms | ||
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When using ESLint v9.0.0 or later with a plugin, you may see one of the following errors: | ||
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```plaintext | ||
TypeError: context.getScope is not a function | ||
TypeError: context.getAncestors is not a function | ||
TypeError: context.markVariableAsUsed is not a function | ||
TypeError: context.getDeclaredVariables is not a function | ||
``` | ||
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## Cause | ||
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ESLint v9.0.0 introduces [changes to the rules API](https://eslint.org/blog/2023/09/preparing-custom-rules-eslint-v9/) that plugin rules use, which included moving some methods from the `context` object to the `sourceCode` object. If you're seeing one of these errors, that means the plugin has not yet been updated to use the new rules API. | ||
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## Resolution | ||
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Common resolutions for this issue include: | ||
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* Upgrade the plugin to the latest version | ||
* Use the [compatibility utilities](https://eslint.org/blog/2024/05/eslint-compatibility-utilities/) to patch the plugin in your config file | ||
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::: important | ||
If you are already using the latest version of the plugin and you need to use the compatibility utilities to make the plugin work with ESLint v9.0.0 and later, make sure to open an issue on the plugin's repository to ask the maintainer to make the necessary API changes. | ||
::: | ||
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## Resources | ||
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For more information, see: | ||
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* [Configure Plugins](../configure/plugins) for documentation on how to configure plugins | ||
* [Create Plugins](../../extend/plugins#configs-in-plugins) for documentation on how to define plugins |
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