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Posted to notifications@superset.apache.org by "free312 (via GitHub)" <gi...@apache.org> on 2026/02/24 08:41:48 UTC
[I] Tab element in Layout fails with "TypeError: (intermediate value).difference is not a function" in QQ Browser [superset]
free312 opened a new issue, #38212:
URL: https://github.com/apache/superset/issues/38212
### Bug description
When using the Tab element in the Layout section to build a dashboard and previewing the dashboard in QQ Browser, the page fails to load and throws a JavaScript TypeError. This issue does not occur in modern browsers like Chrome, Firefox, or Edge, indicating compatibility with QQ Browser's JavaScript engine (which lacks extended Set prototype methods like difference/union used in the Tab element logic).
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### Screenshots/recordings
_No response_
### Superset version
master / latest-dev
### Python version
3.9
### Node version
16
### Browser
Not applicable
### Additional context
_No response_
### Checklist
- [ ] I have searched Superset docs and Slack and didn't find a solution to my problem.
- [ ] I have searched the GitHub issue tracker and didn't find a similar bug report.
- [ ] I have checked Superset's logs for errors and if I found a relevant Python stacktrace, I included it here as text in the "additional context" section.
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Re: [I] Tab element in Layout fails with "TypeError: (intermediate value).difference is not a function" in QQ Browser [superset]
Posted by "free312 (via GitHub)" <gi...@apache.org>.
free312 commented on issue #38212:
URL: https://github.com/apache/superset/issues/38212#issuecomment-3950096275
<img width="1905" height="974" alt="Image" src="https://github.com/user-attachments/assets/572e2ea6-140d-4ca5-b40f-4dc2b7f91818" />
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Re: [I] Tab element in Layout fails with "TypeError: (intermediate value).difference is not a function" in QQ Browser [superset]
Posted by "free312 (via GitHub)" <gi...@apache.org>.
free312 closed issue #38212: Tab element in Layout fails with "TypeError: (intermediate value).difference is not a function" in QQ Browser
URL: https://github.com/apache/superset/issues/38212
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Re: [I] Tab element in Layout fails with "TypeError: (intermediate value).difference is not a function" in QQ Browser [superset]
Posted by "dosubot[bot] (via GitHub)" <gi...@apache.org>.
dosubot[bot] commented on issue #38212:
URL: https://github.com/apache/superset/issues/38212#issuecomment-3950110564
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Hi @free312! I'm [Dosu](https://go.dosu.dev/dosubot) and I’m helping the superset team.
<!-- Answer -->
This is a known issue introduced in Superset 5.0.0. The error occurs because [PR #35265](https://github.com/apache/superset/pull/35265) added `Set.prototype.difference()` and `Set.prototype.union()` methods in the [dashboard state reducer](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset-frontend/src/dashboard/reducers/dashboardState.js#L211-L224) to manage active/inactive tab states. These are ES2025 features that require Chrome 122+ and aren't supported in older browsers like QQ Browser.
This issue is tracked in [#35583](https://github.com/apache/superset/issues/35583).
**Workarounds:**
1. **Upgrade browser** to Chrome 122+ or a modern browser that supports `Set.prototype.difference`
2. **Use a different browser** (Chrome, Firefox, Edge) for accessing dashboards with tabs
The root cause is that despite Superset having polyfill infrastructure with core-js, these Set methods aren't being polyfilled because the [browserslist only targets the last 3 versions of modern browsers](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset-frontend/package.json#L78-L83).
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