🐛 BUG: "PostCSS configuration was not passed or is invalid" with svelte renderer

[Tc-001]

What version of astro are you using?

0.22.1

What package manager are you using?

yarn

What operating system are you using?

Linux

Describe the Bug

When rendering a page with a svelte component, the following error will show (even if I am not using postcss) :

[svelte-preprocess] PostCSS configuration was not passed or is invalid. If you expect to load it from a file make sure to install "postcss-load-config" and try again.

Error: Cannot find module 'postcss-load-config'
Require stack:
- /sandbox/node_modules/svelte-preprocess/dist/transformers/postcss.js
- /sandbox/node_modules/svelte-preprocess/dist/autoProcess.js
- /sandbox/node_modules/svelte-preprocess/dist/index.js

This will not fail the build and the component seems to function as normal, but still floods the console.

Link to Minimal Reproducible Example

Astro.new svelte starter example (https://codesandbox.io/s/github/snowpackjs/astro/tree/latest/examples/framework-svelte)

[Tc-001]

I could reproduce it on the starter, but it seems that after caching for the first time the error will not show.
Forking the sandbox starts a new instance and reproduces it (same with restarting from the server control panel)

[SteveALee]

Ditto but different config. I copied the svelte example diffs into minimal example

What version of astro are you using?
0.22.3

What package manager are you using?
npm

What operating system are you using?
WSL (in VS Code terminal)

[jonathantneal]

Verified in 0.22.17

[ludwigschubert]

Workaround

In Astro 0.22.17, adding "postcss-load-config": "^3.1.1" to devDependencies, and an effectively empty postcss.config.js file:

module.exports = {
  plugins: []
};

got rid of the warning for me. (+ I used the opportunity to learn about PostCSS and ended up adding the autoprefixer plugin to my project. \o/)

Link to Minimal Reproducible Example

https://codesandbox.io/s/sharp-breeze-j782n?file=/postcss.config.js
https://codesandbox.io/s/sharp-breeze-j782n?file=/package.json

[natemoo-re]

Sorry this took so long! Should be fixed by #2715

[natemoo-re]

Sorry y'all. Had to revert #2715 due to this change breaking some things in the new static build mode in astro 0.24. I'm hoping to (re)fix this ASAP.

[jonburger]

Probably doesn't help, but I'm experiencing the same issue today using:

0.24.0 / npm 7.20.3 / MacOS

[FredKSchott]

Sorry about this one, yall!
FYI a short-term fix that you can run for this was outlined here:

1. `npm install postcss-load-config`
2. `echo "module.exports = {}" > postcss.config.js`