fix(migrate): keep vite/rolldown imports as they are

crates/vp_migration/src/import_rewriter.rs

@@ -112,6 +112,8 @@ rule:
   pattern: $STR
   kind: string
   regex: ^['"]vite/.+['"]$
+  not:
+    regex: ^['"]vite/rolldown(/.*)?['"]$
   inside:
     kind: import_statement
 transform:
@@ -128,6 +130,8 @@ rule:
   pattern: $STR
   kind: string
   regex: ^['"]vite/.+['"]$
+  not:
+    regex: ^['"]vite/rolldown(/.*)?['"]$
   inside:
     kind: export_statement
 transform:
@@ -144,6 +148,8 @@ rule:
   pattern: $STR
   kind: string
   regex: ^['"]vite/.+['"]$
+  not:
+    regex: ^['"]vite/rolldown(/.*)?['"]$
   inside:
     kind: arguments
     inside:
@@ -165,6 +171,8 @@ rule:
   pattern: $STR
   kind: string
   regex: ^['"]vite/.+['"]$
+  not:
+    regex: ^['"]vite/rolldown(/.*)?['"]$
   inside:
     kind: arguments
     inside:
@@ -202,6 +210,8 @@ rule:
   pattern: $STR
   kind: string
   regex: ^['\"]vite/.+['\"]$
+  not:
+    regex: ^['"]vite/rolldown(/.*)?['"]$
   inside:
     kind: module
 transform:
@@ -1738,6 +1748,11 @@ static RE_REF_VITE_SUBPATH: LazyLock<Regex> = LazyLock::new(|| {
     Regex::new(r#"^(\s*///\s*<reference\s+types\s*=\s*["'])vite/(.+?)(["']\s*/>)"#).unwrap()
 });
 
+/// `vite/rolldown[/...]` is not re-exported by `vite-plus`, so it stays untouched.
+static RE_REF_VITE_ROLLDOWN: LazyLock<Regex> = LazyLock::new(|| {
+    Regex::new(r#"^\s*///\s*<reference\s+types\s*=\s*["']vite/rolldown(/[^"']*)?["']"#).unwrap()
+});
+
 /// bare `tsdown` → `vite-plus/pack`
 static RE_REF_TSDOWN: LazyLock<Regex> = LazyLock::new(|| {
     Regex::new(r#"^(\s*///\s*<reference\s+types\s*=\s*["'])tsdown(["']\s*/>)"#).unwrap()
@@ -1986,7 +2001,9 @@ fn rewrite_reference_types(
             }
         }
         if !skip_packages.skip_vite {
-            if apply_regex_replace(line, &RE_REF_VITE_SUBPATH, "${1}vite-plus/${2}${3}") {
+            if !RE_REF_VITE_ROLLDOWN.is_match(line)
+                && apply_regex_replace(line, &RE_REF_VITE_SUBPATH, "${1}vite-plus/${2}${3}")
+            {
                 changed = true;
                 continue;
             }
@@ -3305,6 +3322,26 @@ export default ModuleRunner;"#
         );
     }
 
+    #[test]
+    fn test_rewrite_import_content_vite_rolldown_subpath_is_kept() {
+        let vite_config = r#"/// <reference types="vite/rolldown/plugins" />
+import "vite/rolldown/plugins";
+import { viteAliasPlugin } from 'vite/rolldown/plugins';
+import 'vite/rolldown';
+export * from "vite/rolldown/utils";
+const a = require('vite/rolldown/plugins');
+const b = await import('vite/rolldown/plugins');
+declare module 'vite/rolldown/plugins' {}
+import { ModuleRunner } from 'vite/module-runner';"#;
+
+        let result = rewrite_import_content(vite_config, &SkipPackages::default()).unwrap();
+        assert!(result.updated);
+        assert_eq!(
+            result.content,
+            vite_config.replace("'vite/module-runner'", "'vite-plus/module-runner'")
+        );
+    }
+
     #[test]
     fn test_rewrite_import_content_vite_subpath_double_quotes() {
         let vite_config = r#"import { ModuleRunner } from "vite/module-runner";

docs/guide/migrate-rules.md

@@ -185,6 +185,8 @@ Object-valued nested npm and Bun overrides are preserved: they are user-defined
 
 Plugin packages (an unscoped name starting with `vite-plugin-` or `unplugin-`, or `vite` in `peerDependencies`/`dependencies`) skip the rewrite even in config files. Only the `vite` specifier is in scope for this rule.
 
+`vite/rolldown` and `vite/rolldown/*` are never rewritten, because `vite-plus` does not export those subpaths; they keep resolving through the core alias.
+
 `declare module 'vite'` augmentations follow the same rule and are preserved outside config files. Through the core alias they reach the same `@voidzero-dev/vite-plus-core` module whose `UserConfig` types `defineConfig` from `vite-plus`, so they keep working after migration; `vite-plus` itself exports no `UserConfig` symbol, so a rewritten `declare module 'vite-plus'` augmentation would merge with nothing. Extensions aimed at `vite-plus`'s own surface are written against `vite-plus` by hand.
 
 ### `vitest` and Browser Imports