css output includes "null"

[TehShrike]

Based on my testing, this bug was introduced in 1.60.0, and still exists in 1.60.2.

I'm sorry I don't have a slimmer reproduction right now, but I figured it's worth opening an issue now anyway for this one.

The CSS output for my app is including "null" several times:

I disabled the CSS preprocessing to make sure that wasn't involved.

I am not using spread properties.

The issue can be reproduced in this branch of my app repo: https://github.com/TehShrike/canon-reader/tree/without-css-preprocessing

npm i
npm run build:js
cat public/build/components.css

If I get a slimmer reproduction I'll post.

[Rich-Harris]

npm install -D rollup-plugin-svelte@latest 😀

sorry, I thought I could do #1298 without breaking changes. I was wrong

[TehShrike]

whew! 👍

[TehShrike]

Is there an expectation that whenever I run npm i svelte@latest I should also run npm i my-bundler-svelte-plugin@latest?