fix: add vite-plus/pack/client export as tsdown/client equivalent

crates/vite_migration/src/import_rewriter.rs

@@ -336,6 +336,11 @@ static RE_REF_TSDOWN: LazyLock<Regex> = LazyLock::new(|| {
     Regex::new(r#"^(\s*///\s*<reference\s+types\s*=\s*["'])tsdown(["']\s*/>)"#).unwrap()
 });
 
+/// `tsdown/client` → `vite-plus/pack/client`
+static RE_REF_TSDOWN_CLIENT: LazyLock<Regex> = LazyLock::new(|| {
+    Regex::new(r#"^(\s*///\s*<reference\s+types\s*=\s*["'])tsdown/client(["']\s*/>)"#).unwrap()
+});
+
 /// Apply a single regex replacement, updating `content` in place if matched.
 /// Uses `Cow::Owned` variant check to avoid O(n) string comparison on no-match.
 /// Uses `replace` (not `replace_all`) since each line contains at most one reference directive.
@@ -495,10 +500,14 @@ fn rewrite_reference_types(content: &mut String, skip_packages: &SkipPackages) -
                 continue;
             }
         }
-        if !skip_packages.skip_tsdown
-            && apply_regex_replace(line, &RE_REF_TSDOWN, "${1}vite-plus/pack${2}")
-        {
-            changed = true;
+        if !skip_packages.skip_tsdown {
+            if apply_regex_replace(line, &RE_REF_TSDOWN_CLIENT, "${1}vite-plus/pack/client${2}") {
+                changed = true;
+                continue;
+            }
+            if apply_regex_replace(line, &RE_REF_TSDOWN, "${1}vite-plus/pack${2}") {
+                changed = true;
+            }
         }
     }
 
@@ -2463,12 +2472,12 @@ export default defineConfig({});"#
     }
 
     #[test]
-    fn test_rewrite_reference_types_tsdown_subpath_not_rewritten() {
-        // tsdown subpaths should NOT be rewritten because vite-plus only exports ./pack (no subpaths)
+    fn test_rewrite_reference_types_tsdown_client_rewritten() {
+        // tsdown/client should be rewritten to vite-plus/pack/client
         let content = r#"/// <reference types="tsdown/client" />"#;
         let result = rewrite_import_content(content, &SkipPackages::default()).unwrap();
-        assert!(!result.updated);
-        assert_eq!(result.content, content);
+        assert!(result.updated);
+        assert_eq!(result.content, r#"/// <reference types="vite-plus/pack/client" />"#);
     }
 
     #[test]

packages/cli/build.ts

@@ -168,6 +168,13 @@ async function syncCorePackageExports() {
     `/// <reference types="${CORE_PACKAGE_NAME}/client" />\n`,
   );
 
+  // Create ./pack/client shim (types only) - ambient type declarations for tsdown bundler features
+  console.log('  Creating ./pack/client');
+  await writeFile(
+    join(distDir, 'pack-client.d.ts'),
+    `/// <reference types="${CORE_PACKAGE_NAME}/pack/client" />\n`,
+  );
+
   // Create ./module-runner shim
   console.log('  Creating ./module-runner');
   await writeFile(

packages/cli/package.json

@@ -79,6 +79,9 @@
       "types": "./dist/pack.d.ts",
       "import": "./dist/pack.js"
     },
+    "./pack/client": {
+      "types": "./dist/pack-client.d.ts"
+    },
     "./versions": {
       "types": "./dist/versions.d.ts",
       "default": "./dist/versions.js"

packages/cli/snap-tests-global/migration-rewrite-reference-types/snap.txt

@@ -10,3 +10,4 @@
 /// <reference types="vite-plus/test/globals" />
 /// <reference types="vite-plus" />
 /// <reference types="vite-plus/test/browser/context" />
+/// <reference types="vite-plus/pack/client" />

packages/cli/snap-tests-global/migration-rewrite-reference-types/src/env.d.ts

@@ -4,3 +4,4 @@
 /// <reference types="vitest/globals" />
 /// <reference types="vitest/config" />
 /// <reference types="@vitest/browser/context" />
+/// <reference types="tsdown/client" />

packages/core/__tests__/build-artifacts.spec.ts

@@ -16,4 +16,13 @@ describe('build artifacts', () => {
     expect(content).toContain('__dirname');
     expect(content).toContain('__filename');
   });
+
+  it('should include tsdown client.d.ts in dist/tsdown for pack/client support', () => {
+    const clientPath = path.join(distDir, 'tsdown/client.d.ts');
+    expect(fs.existsSync(clientPath), `${clientPath} should exist`).toBe(true);
+
+    const content = fs.readFileSync(clientPath, 'utf8');
+    expect(content).toContain('ImportMeta');
+    expect(content).toContain('glob');
+  });
 });

packages/core/build.ts

@@ -436,6 +436,10 @@ async function bundleTsdown() {
   // tsdown resolves this file via path.resolve(import.meta.dirname, '..', 'esm-shims.js'),
   // which means it expects the file at dist/esm-shims.js (one level up from dist/tsdown/).
   await copyFile(join(tsdownSourceDir, 'esm-shims.js'), join(projectDir, 'dist/esm-shims.js'));
+
+  // Copy client.d.ts to dist/tsdown/ to expose it as the vite-plus/pack/client entry point,
+  // equivalent to tsdown/client for registering bundler type features with TypeScript.
+  await copyFile(join(tsdownSourceDir, 'client.d.ts'), join(projectDir, 'dist/tsdown/client.d.ts'));
 }
 
 async function brandTsdown() {

packages/core/package.json

@@ -46,6 +46,9 @@
       "default": "./dist/tsdown/index.js",
       "types": "./dist/tsdown/index-types.d.ts"
     },
+    "./pack/client": {
+      "types": "./dist/tsdown/client.d.ts"
+    },
     "./package.json": "./package.json",
     "./rolldown": {
       "default": "./dist/rolldown/index.mjs",