Add change log and improve error messages

CHANGELOG.md

@@ -11,6 +11,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Add new standalone builds of Tailwind CSS v4 ([#14270](https://github.com/tailwindlabs/tailwindcss/pull/14270))
 
+### Added
+
+- Add support for `@config` to load V3 JavaScript config files ([#14239](https://github.com/tailwindlabs/tailwindcss/pull/14239))
+
 ### Fixed
 
 - Bring back type exports for the cjs build of `@tailwindcss/postcss` ([#14256](https://github.com/tailwindlabs/tailwindcss/pull/14256))

packages/tailwindcss/src/compat/config/resolve-config.ts

@@ -127,7 +127,9 @@ function extractConfigs(ctx: ResolutionContext, { config, path }: ConfigFile): v
 
   // Apply configs from presets
   if (Array.isArray(config.presets) && config.presets.length === 0) {
-    throw new Error('The empty preset `[]` is not supported')
+    throw new Error(
+      'Error in the config file/plugin/preset. An empty preset (`preset: []`) is not currently supported.',
+    )
   }
 
   for (let preset of config.presets ?? []) {

packages/tailwindcss/src/index.ts

@@ -342,7 +342,9 @@ async function parseCss(
 
   for (let file of resolvedConfig.content.files) {
     if ('raw' in file) {
-      throw new Error('raw content is not currently supported')
+      throw new Error(
+        `Error in the config file/plugin/preset. The \`content\` key contains a \`raw\` entry:\n\n${JSON.stringify(file, null, 2)}\n\nThis feature is not currently supported.`,
+      )
     }
 
     globs.push(file.pattern)