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Mermaid code blocks render as diagrams once streaming completes, with a copy button for the source and a toggle between the diagram and the source.
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… speed up streaming Add copy as SVG, copy as image and download PNG to rendered mermaid blocks, using the shared ff-btn styles. Diagrams render as soon as their closing fence has streamed in, and text streams several words per tick.
andypalmi
marked this pull request as draft
October 21, 2026 10:52
…d of bundling mermaid The Expert now sends each rendered diagram's SVG alongside the message, so the frontend no longer needs the mermaid dependency. The SVG is sanitized, matched to its code block by source, and recoloured with the FlowFuse theme variables.
… whitespace Streaming collapses runs of whitespace in code, so the indented source of a block no longer equalled the source the diagram was rendered from.
The diagrams take their colours from variables, so one set of values follows the FlowFuse theme instead of overriding the diagram's own classes.
… highlight mermaid code Mermaid blocks are now a plain code block variant. The Code toggle and export buttons are added once the diagram is shown and the toggle uses the hidden attribute, which removes the state-driven CSS and leaves other code blocks as they were. Mermaid sources get a highlight.js grammar.
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Closes #9010
Closes FlowFuse/engineering#577
Closes FlowFuse/engineering#578
Testing