postcss: Improve validation of option 'config'

1 files changed, 6 insertions, 2 deletions

diff --git a/resources/resource_transformers/babel/babel.go b/resources/resource_transformers/babel/babel.go
index ff19d9dda..5ed09d200 100644
--- a/resources/resource_transformers/babel/babel.go
+++ b/resources/resource_transformers/babel/babel.go
@@ -134,13 +134,17 @@ func (t *babelTransformation) Transform(ctx *resources.ResourceTransformationCtx
 	}
 
 	configFile = filepath.Clean(configFile)
+	isConfigFileDir := false
 
 	// We need an absolute filename to the config file.
 	if !filepath.IsAbs(configFile) {
-		configFile = t.rs.BaseFs.ResolveJSConfigFile(configFile)
+		configFile, isConfigFileDir = t.rs.BaseFs.ResolveJSConfigFile(configFile)
+		if isConfigFileDir {
+			logger.Warnf("babel config %q must be a file, not a directory", configFile)
+		}
 		if configFile == "" && t.options.Config != "" {
 			// Only fail if the user specified config file is not found.
-			return fmt.Errorf("babel config %q not found:", configFile)
+			return fmt.Errorf("babel config file %q not found", configFile)
 		}
 	}