Fix empty Markdown code blocks rendering as “undefined” #13074
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Pull Request Overview
This PR fixes an issue where empty Markdown code blocks render as "undefined" instead of being empty. The fix processes the children prop to filter out "undefined" strings and handle null/empty values properly.
Key changes:
- Made the
childrenprop optional in the component interface - Added preprocessing logic to handle various children states (array, null, string, "undefined")
- Simplified the copy button conditional rendering to use the processed text
frontend/lib/src/components/elements/CodeBlock/StreamlitSyntaxHighlighter.tsx
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frontend/lib/src/components/elements/CodeBlock/StreamlitSyntaxHighlighter.tsx
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![graphite-app[bot]](https://avatars.githubusercontent.com/in/158384?s=60&v=4){kind=small}
frontend/lib/src/components/elements/CodeBlock/StreamlitSyntaxHighlighter.tsx
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@sfc-gh-bnisco I'm not very good at front-end development. Could you review my PR? |
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sfc-gh-bnisco
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Nov 21, 2025
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Thank you for the contribution and iterations @ashm-dev! I made some updates and added tests.
frontend/lib/src/components/elements/CodeBlock/StreamlitSyntaxHighlighter.tsx
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sfc-gh-nbellante
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Only 1 q, other than that LGTM 👍
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Fixes #12986