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When upgrading Docusaurus to React 19, I noticed some warnings in documentation pages containing React-Live playgrounds
It turns out React 19 has a new warning in dev mode:
VM59912:5 Your app (or one of its dependencies) is using an outdated JSX transform. Update to the modern JSX transform for faster performance: https://react.dev/link/new-jsx-transform Error Component Stack
at Hello (<anonymous>)
at ErrorBoundary (eval at ../node_modules/react-live/dist/index.mjs (vendors-node_modules_parse-numeric-range_index_js-node_modules_react-live_dist_index_mjs-node-bdedd5.js:338:1), <anonymous>:161:10)
at div (<anonymous>)
at LivePreview (eval at ../node_modules/react-live/dist/index.mjs (vendors-node_modules_parse-numeric-range_index_js-node_modules_react-live_dist_index_mjs-node-bdedd5.js:338:1), <anonymous>:331:29)
at ErrorBoundary (eval at ../packages/docusaurus/lib/client/exports/ErrorBoundary.js (main.js:1021:1), <anonymous>:29:9)
at BrowserOnly (eval at ../packages/docusaurus/lib/client/exports/BrowserOnly.js (__comp---theme-blog-post-pageccc-cab.js:488:1), <anonymous>:19:24)
at Preview (<anonymous>)
By default, React-Live is using Sucrase to transform the code, but there's no ability to customize the JSX runtime (classic by default).
An option to turn on the automatic runtime would be welcome to get rid of this warning.
To be honest, I'm not 100% sure why there is a warning, considering React.createElement is considered fine although not optimal according to the linked page.
Note
The functions inside react/jsx-runtime and react/jsx-dev-runtime must only be used by the compiler transform. If you need to manually create elements in your code, you should keep using React.createElement. It will continue to work and is not going away.
In any case, it looks future proof to support the automatic runtime in this lib
The text was updated successfully, but these errors were encountered:
Is there an existing issue for this?
Code of Conduct
Feature Request
By default, React-Live is using Sucrase to transform the code, but there's no ability to customize the JSX runtime (classic by default).
An option to turn on the automatic runtime would be welcome to get rid of this warning.
To be honest, I'm not 100% sure why there is a warning, considering
React.createElement
is considered fine although not optimal according to the linked page.In any case, it looks future proof to support the automatic runtime in this lib
The text was updated successfully, but these errors were encountered: