Bundle package into dist/prettier/ (#15825)

scripts/build/parse-arguments.js

@@ -39,7 +39,9 @@ function parseArguments() {
       );
     }
 
-    if (!path.join(DIST_DIR, result.saveAs).startsWith(DIST_DIR)) {
+    // TODO: Support package name
+    const distDirectory = path.join(DIST_DIR, "prettier");
+    if (!path.join(distDirectory, result.saveAs).startsWith(distDirectory)) {
       throw new Error("'--save-as' can only relative path");
     }
   }