Description

Fixes #31361.

Step-by-step reproduction instructions

1. run npx @wordpress/create-block test-block-2

Actual behaviour

This is the output of npx @wordpress/create-block test-block-2`

I've included part of the error message below.

ERROR in ./src/style.scss Module build failed (from ./node_modules/mini-css-extract-plugin/dist/loader.js): ModuleBuildError: Module build failed (from ./node_modules/postcss-loader/dist/cjs.js): Error: [object Object] is not a PostCSS plugin at Processor.normalize

When I run npm run start inside the directory of my newly created block, I receive the same error message, here it is in full

How has this been tested?

I installed manually the same version of postcss v8.2.2 that Gutenberg uses in the scaffolded project. It resolves the issue, so the fix does the same on the @wordpress/scripts level.

Types of changes

Bug fix (non-breaking change which fixes an issue).

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• I've tested my changes with keyboard and screen readers.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.
• I've updated all React Native files affected by any refactorings/renamings in this PR (please manually search all *.native.js files for terms that need renaming or removal).