When will CodeBuild offer nodejs v18 (or higher)?

All CodeBuild images use the n command to install the Node version.

This command is available to you during the build. The delay is negligible in my experience, and it takes just a few seconds to upgrade Node.

Docs: https://github.com/tj/n

Add this to your Install phase:

n install 18
node --version

I prefer to do this regardless of the available versions in the image, just to make sure the same Node version is used in all environments.

I use .nvmrc file to maintain the version in the project.

Then in every CodeBuild project, I install the exact version this way:

n install $(cat .nvmrc)
node --version

And if you use GitHub Actions, it has support for that as well:

That way, I just need to change the version in one place.