@@ -57,9 +57,15 @@ export function extractFontType(str: string): FontType {
 	// Extname includes a leading dot
 	const extension = extname(str).slice(1);
 	if (!isFontType(extension)) {
-		throw new AstroError(AstroErrorData.CannotExtractFontType, {
-			cause: `Unexpected extension, got "${extension}"`,
-		});
+		throw new AstroError(
+			{
+				...AstroErrorData.CannotExtractFontType,
+				message: AstroErrorData.CannotExtractFontType.message(str),
+			},
+			{
+				cause: `Unexpected extension, got "${extension}"`,
+			},
+		);
 	}
 	return extension;
 }
 
@@ -1297,10 +1297,13 @@ export const UnknownFilesystemError = {
  * @docs
  * @description
  * Cannot extract the font type from the given URL.
+ * @message
+ * An error occured while trying to extract the font type from the given URL.
  */
 export const CannotExtractFontType = {
 	name: 'CannotExtractFontType',
 	title: 'Cannot extract the font type from the given URL.',
+	message: (url: string) => `An error occurred while trying to extract the font type from ${url}`,
 	hint: 'Open an issue at https://github.com/withastro/astro/issues.',
 } satisfies ErrorData;