fix(fullstack): avoid addWatchFile for assets virtual (#1194)

Author: hi-ogawa

packages/fullstack/src/plugin.ts

@@ -233,7 +233,9 @@ export function assetsPlugin(pluginOpts?: FullstackPluginOptions): Plugin[] {
             if (environment.name !== "client") {
               const collected = await collectCss(environment, resolved.id);
               for (const file of [resolved.id, ...collected.visitedFiles]) {
-                this.addWatchFile(file);
+                if (fs.existsSync(file)) {
+                  this.addWatchFile(file);
+                }
               }
               result.css = collected.hrefs.map((href, i) => ({
                 href,
@@ -398,7 +400,7 @@ async function collectCss(environment: DevEnvironment, entryId: string) {
   const visitedFiles = new Set<string>();
 
   async function recurse(id: string) {
-    if (visited.has(id)) {
+    if (visited.has(id) || parseAssetsVirtual(id)) {
       return;
     }
     visited.add(id);
@@ -407,7 +409,7 @@ async function collectCss(environment: DevEnvironment, entryId: string) {
     // TODO: this is not ideal.
     // We eagerly transforming module is required
     // to allow patterns like packages/fullstack/examples/react-router/src/routes.ts
-    if (!mod.transformResult && !parseAssetsVirtual(id)) {
+    if (!mod.transformResult) {
       try {
         await environment.transformRequest(id);
       } catch (e) {