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fix: add missing xmlns:xlink namespace for Mermaid PNG export #547

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fix: add missing xmlns:xlink namespace for Mermaid PNG export #547

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14 changes: 13 additions & 1 deletion packages/streamdown/lib/mermaid/utils.ts
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Original file line number Diff line number Diff line change
@@ -1,3 +1,13 @@
/**
* Ensure SVG string has required XML namespaces for canvas rendering
*/
function normalizeSvg(svg: string): string {
if (svg.includes("xlink:href") && !svg.includes("xmlns:xlink")) {
return svg.replace("<svg", '<svg xmlns:xlink="http://www.w3.org/1999/xlink"');
}
return svg;
}

/**
* Convert SVG string to PNG blob for export
*/
Expand All @@ -8,9 +18,11 @@ export const svgToPngBlob = (
const scale = options?.scale ?? 5;

return new Promise((resolve, reject) => {
const normalized = normalizeSvg(svgString);

const encoded =
"data:image/svg+xml;base64," +
btoa(unescape(encodeURIComponent(svgString)));
btoa(unescape(encodeURIComponent(normalized)));

const img = new Image();
img.crossOrigin = "anonymous";
Expand Down