fix: Use runtime: 'classic' in the browser for React#18086
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liuxingbaoyu
commented
Jun 19, 2026
Member
| Q | A |
|---|---|
| Fixed Issues? | Fixes #18085 |
| Patch: Bug Fix? | √ |
| Major: Breaking Change? | |
| Minor: New Feature? | |
| Tests Added + Pass? | √ |
| Documentation PR Link | |
| Any Dependency Changes? | |
| License | MIT |
runtime: 'classic' in the browser for Reactruntime: 'classic' in the browser for React
Collaborator
|
Build successful! You can test your changes in the REPL here: https://babeljs.io/repl/build/61808 |
nicolo-ribaudo
approved these changes
Jun 19, 2026
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commit: |
JLHwung
approved these changes
Jun 19, 2026
JLHwung
reviewed
Jun 19, 2026
| if (script.type === "module") { | ||
| presets = [ | ||
| "react", | ||
| ["react", { runtime: "classic" }], |
Contributor
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We should probably revisit this in the future.
React 19 is no longer shipping UMD (react/react#28735) and if in the future React releases an ESM build, we should figure out how to make babel-standalone work with it.
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