Details: gohugoio/hugo#10846

Description: Calls to postcss-cli silently fail when the config option is wrong

Clone this branch of the repository and build the site.

git clone --single-branch -b hugo-github-issue-10846 https://github.com/jmooring/hugo-testing hugo-github-issue-10846
cd hugo-github-issue-10846
npm ci
hugo && cat public/index.html

This should throw an error.

If postcss were actually doing something, the content of public/index.html would be:

::-moz-placeholder {
  color: gray;
}
::placeholder {
  color: gray;
}