gatsby-plugin-netlify-cms react-18 require.resolve

[kspeyanski]

Preliminary Checks

• This issue is not a duplicate. Before opening a new issue, please search existing issues: https://github.com/gatsbyjs/gatsby/issues
• This issue is not a question, feature request, RFC, or anything other than a bug report directly related to Gatsby. Please post those things in GitHub Discussions: https://github.com/gatsbyjs/gatsby/discussions

Description

Hello,

Currently both the latest and next tags of the gatsby-plugin-netlify-cms throw an error when used with react18:

Package subpath './umd/react.production.min.js' is not defined

The issue can be reproduced with the default gatsby-starter-netlify-cms

Reproduction Link

https://www.gatsbyjs.com/starters/netlify-templates/gatsby-starter-netlify-cms

Steps to Reproduce

1. Run npx gatsby new gatsby-starter-netlify-cms https://github.com/netlify-templates/gatsby-starter-netlify-cms
2. Install react@18 and react-dom@18
3. Run gatsby develop
4. pain

Expected Result

No error!

Actual Result

An error is being thrown:

Package subpath './umd/react.production.min.js' is not defined

Environment

System:
    OS: macOS 12.2.1
    CPU: (12) x64 Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz
    Shell: 5.8 - /bin/zsh
  Binaries:
    Node: 16.14.2 - ~/.nvm/versions/node/v16.14.2/bin/node
    Yarn: 1.22.4 - ~/.yarn/bin/yarn
    npm: 8.5.0 - ~/.nvm/versions/node/v16.14.2/bin/npm
  Languages:
    Python: 2.7.18 - /usr/bin/python
  Browsers:
    Chrome: 100.0.4896.75
    Edge: 100.0.1185.29
    Firefox: 96.0.2
    Safari: 15.3
  npmPackages:
    gatsby: ^4.0.0 => 4.11.2
    gatsby-plugin-image: ^2.0.0 => 2.11.1
    gatsby-plugin-netlify: ^3.14.0 => 3.14.0
    gatsby-plugin-netlify-cms: ^6.0.0 => 6.11.0
    gatsby-plugin-purgecss: ^6.0.0 => 6.1.1
    gatsby-plugin-react-helmet: ^5.0.0 => 5.11.0
    gatsby-plugin-sass: ^5.0.0 => 5.11.1
    gatsby-plugin-sharp: ^4.0.0 => 4.11.1
    gatsby-remark-copy-linked-files: ^5.0.0 => 5.11.0
    gatsby-remark-images: ^6.0.0 => 6.11.1
    gatsby-remark-relative-images: ^0.3.0 => 0.3.0
    gatsby-source-filesystem: ^4.0.0 => 4.11.1
    gatsby-transformer-remark: ^5.0.0 => 5.11.1
    gatsby-transformer-sharp: ^4.0.0 => 4.11.0

Config Flags

N/A