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build(deps-dev): bump tailwindcss from 3.4.1 to 4.2.1 #24

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build(deps-dev): bump tailwindcss from 3.4.1 to 4.2.1 #24

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2 changes: 1 addition & 1 deletion package.json
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Original file line number Diff line number Diff line change
Expand Up @@ -40,7 +40,7 @@
"jsdom": "^27.4.0",
"postcss": "8.4.35",
"prettier": "3.2.4",
"tailwindcss": "3.4.1",
"tailwindcss": "4.2.1",
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@sentry sentry bot Mar 8, 2026

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Bug: The PostCSS configuration will cause a build failure because it references the tailwindcss package as a plugin, but in v4 this has moved to @tailwindcss/postcss.
Severity: CRITICAL

Suggested Fix

Install the new PostCSS plugin package by running pnpm add -D @tailwindcss/postcss. Then, update postcss.config.js to use the new package by changing tailwindcss: {} to '@tailwindcss/postcss': {}.

Prompt for AI Agent 
Review the code at the location below. A potential bug has been identified by an AI
agent.
Verify if this is a real issue. If it is, propose a fix; if not, explain why it's not
valid.

Location: package.json#L43

Potential issue: The project's PostCSS configuration in `postcss.config.js` instantiates
the Tailwind CSS plugin via `tailwindcss: {}`. With the upgrade to Tailwind CSS v4, the
PostCSS plugin has been extracted from the main `tailwindcss` package into a separate
`@tailwindcss/postcss` package. Since `@tailwindcss/postcss` is not added as a
dependency in `package.json`, the build process will fail when PostCSS attempts to load
a plugin that no longer exists in the `tailwindcss` package.

Did we get this right? 👍 / 👎 to inform future reviews.

"typescript": "5.3.3",
"vitest": "^4.0.16"
},
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