fix: Added missing key to templateShadowRoot #7
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spuppo-mux
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Nov 27, 2025
Relates to muxinc/next-video#397 and muxinc/ce-la-react#7 Upgrades ce-la-react to prevent missing key warning when using custom components on SSR.
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Closes #6
The way we create the children array in the SSR case (
typeof window === 'undefined') would cause a warning log to appear on NextJS environments. For example: muxinc/next-video#397This was happening because
reactProps.childrenwas being created as an arraybut the
templateShadowRootelement didn't have a key. Tried to go for a unique enough key so it wouldn't be repeated, but feel free to suggest changes.Unrelated to the bug, I also modified the way we pass the children to the createElement function to follow how it's specified in the docs.
I tested this by publishing the package locally using yalc and linking it to
@mux/mux-video(and doing the same with this package andnext-videoand it's example). Then when running the example, you shouldn't see the missing key warning.