I sat down to upgrade this blog's dependencies. Ordinary work: astro was one

minor behind, and @astrojs/mdx was a whole major behind — I had 7.0.5,

the registry had 8.1.3. Before touching anything I opened the release notes,

as I always do. Astro's 8.0.0 entry says:

If you haven't explicitly installed a Markdown processor, you don't need to

do anything.

I hadn't installed one. So for me this was a no-action major. I was going to

run the upgrade and move on.

I didn't. Because I tried the upgrade in a scratch directory first, and the

first step of my publishing pipeline died before reading its second line:

Error [ERR_MODULE_NOT_FOUND]: Cannot find package 'js-yaml' imported from .../scripts/render-article.mjs

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js-yaml is not in my package.json . None of the eleven third-party

packages that file imports is; js-yaml only blows up first because it comes

first.…