Strange Error while using Casbin
i am trying to use Casbin to do accesControl. I try to run examples code from the web. But when i try to using Casbin in my project in shows strange error, It said that Buffer is not defined and that is from casbin library? Please help me solve this error.
8 Replies
Hi @M Farhan Zachary. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:
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It looks like the error you're encountering is related to the need for polyfills when using Casbin in a browser environment. This is a known issue with Casbin versions greater than 5. To resolve this, you need to configure polyfills for your project.
Here are the steps to solve the "Buffer is not defined" error:
1. Install the required polyfill packages:
2. Update your
vite.config.ts file to include the necessary polyfills:
These steps should help you resolve the issue with the Casbin library in your project. For more detailed information, you can refer to the Refine blog on implementing role-based access control (https://refine.dev/blog/refine-pixels-6/#casbin-installation).
If you need further assistance, you can also check the Refine documentation on Casbin (https://refine.dev/docs/advanced-tutorials/access-control/#casbin) and the example source code (https://github.com/refinedev/refine/tree/master/examples/access-control-casbin).
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eastern-cyanOP•8mo ago
@kapa.ai after following this way i still got an error says "Uncaught SyntaxError: Identifier 'Buffer' has already been declared (at chunk-A4NBPRC6.js?v=2ffe3efa:7987:5)"
Let me check the knowledge base for you. One moment! :books:
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It seems like the error "Uncaught SyntaxError: Identifier 'Buffer' has already been declared" indicates that there might be a conflict or duplication in the polyfill declarations. This can happen if the polyfills are being included multiple times or in an incorrect order.
To resolve this, you can try the following steps:
1. Ensure that
Buffer is not being declared multiple times:
- Check your vite.config.ts file to ensure that Buffer is only being polyfilled once.
2. Modify the vite.config.ts file to avoid redeclaration:
- You might need to adjust the configuration to ensure that Buffer is only polyfilled where necessary.
Here is an updated version of the vite.config.ts file that ensures Buffer is only polyfilled once:
If the issue persists, you might want to check if there are any other parts of your code or dependencies that are also trying to polyfill Buffer. Ensuring that Buffer is only polyfilled once and in the correct context should resolve the conflict.
For more detailed information, you can refer to the Refine blog on implementing role-based access control (https://refine.dev/blog/refine-pixels-6/#casbin-installation) and the Refine documentation on Casbin (https://refine.dev/docs/advanced-tutorials/access-control/#casbin).
If you need further assistance, you can also check the example source code (https://github.com/refinedev/refine/tree/master/examples/access-control-casbin).
----------------------
Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:
----------------------<@757407865391808603> kapa.ai is still learning and improving, please let us know how it did by reacting below
eastern-cyanOP•8mo ago
i still got the "Buffer already declared error"
@kapa.ai i still got the "Buffer already declared error"
here is my dependencies
Let me check the knowledge base for you. One moment! :books:
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It looks like the error "Buffer already declared" is still persisting. This can happen due to multiple polyfills being applied or conflicts in the configuration. Let's try to resolve this by ensuring that the polyfills are correctly configured and not duplicated.
Here is an updated approach to your
vite.config.ts file to ensure that Buffer is only polyfilled once:
1. Ensure that Buffer is not being declared multiple times:
- Check your vite.config.ts file to ensure that Buffer is only being polyfilled once.
2. Update your vite.config.ts file to avoid redeclaration:
- You might need to adjust the configuration to ensure that Buffer is only polyfilled where necessary.
Here is an updated version of the vite.config.ts file that ensures Buffer is only polyfilled once:
If the issue persists, you might want to check if there are any other parts of your code or dependencies that are also trying to polyfill Buffer. Ensuring that Buffer is only polyfilled once and in the correct context should resolve the conflict.
For more detailed information, you can refer to the Refine blog on implementing role-based access control (https://refine.dev/blog/refine-pixels-6/#casbin-installation) and the Refine documentation on Casbin (https://refine.dev/docs/advanced-tutorials/access-control/#casbin).
If you need further assistance, you can also check the example source code (https://github.com/refinedev/refine/tree/master/examples/access-control-casbin).
----------------------
Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:
----------------------<@757407865391808603> kapa.ai is still learning and improving, please let us know how it did by reacting below