Error being thrown by gatsby-plugin-netlify-cms

Netlify CMS
,
#1

My site builds and works in development mode, but when deployed, this error is thrown and the build fails:

3:53:55 PM: error “gatsby-plugin-netlify-cms” threw an error while running the onCreateWebpackConfig lifecycle:
3:53:55 PM: Package subpath ‘./umd/react.production.min.js’ is not defined
3:53:55 PM: 212 | assetDir = _ref6.assetDir;
3:53:55 PM: 213 | return [{
3:53:55 PM: > 214 | from: require.resolve(_path.default.join(name, assetDir, assetName)),
3:53:55 PM: | ^
3:53:55 PM: 215 | to: assetName
3:53:55 PM: 216 | }, sourceMap && {
3:53:55 PM: 217 | from: require.resolve(_path.default.join(name, assetDir, sourceMap)),
3:53:55 PM: Make sure that you don’t have a typo somewhere and use valid arguments in onCreateWebpackConfig lifecycle.
Learn more about onCreateWebpackConfig here: Gatsby Node APIs

I’m clueless as to where the error lies. Any ideas?

#2

Did you upgrade your app to use React v18 recently?

I updated to v18 and encountered the same error, went back to v17 and the error went away.

#3

Wait so does that mean that Netlify CMS doesn’t support React 18 yet? (Can someone at Netlify confirm this?)

#4

Hey @mosesoak,

I believe the best way to confirm that is by opening an issue on Netlify CMS repo. The Support Team doesn’t actively provide full-fledged support for Netlify CMS, so we cannot confirm this.