fix: apply resolve.alias before Deno resolution and add SSR noExternal for radix-ui

Apply Vite's resolve.alias config (e.g. react -> preact/compat) in
deno.ts before calling @deno/loader, so the alias works even when
packages are externalized in SSR mode.

Also add noExternal for @radix-ui packages in the SSR environment
since they depend on React compat aliases being applied.

WIP: radix test still failing — alias format from Vite config needs
further investigation.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: bartlomieju

deno.json

@@ -1,6 +1,7 @@
 {
   "vendor": true,
   "nodeModulesDir": "manual",
+  "links": ["../deno-vite-plugin"],
   "workspace": [
     "./packages/*",
     "./www"

deno.lock

@@ -179,6 +179,13 @@ export function fresh(config?: FreshViteConfig): Plugin[] {
               },
             },
             ssr: {
+              resolve: {
+                // Packages that depend on React compat aliases must not
+                // be externalized — Node.js require() wouldn't apply
+                // the react->preact/compat alias and would load the
+                // real React or get CJS/ESM interop issues.
+                noExternal: [/^@radix-ui/],
+              },
               build: {
                 manifest: true,
                 emitAssets: true,

packages/plugin-vite/src/mod.ts

@@ -83,11 +83,16 @@ export function deno(): Plugin {
 
       // Apply resolve.alias before Deno resolution so that
       // react -> preact/compat works even in externalized packages.
+      // Vite normalizes alias config to { find, replacement }[] format.
       const aliases = this.environment?.config?.resolve?.alias;
-      if (Array.isArray(aliases)) {
-        for (const alias of aliases) {
-          if (typeof alias.find === "string" && alias.find === id) {
-            id = alias.replacement;
+      if (aliases) {
+        const list = Array.isArray(aliases) ? aliases : [];
+        for (const alias of list) {
+          const find = alias.find;
+          if (typeof find === "string" ? find === id : find?.test?.(id)) {
+            id = typeof alias.replacement === "string"
+              ? alias.replacement
+              : id;
             break;
           }
         }