diff --git a/apps/stage-tamagotchi/electron.vite.config.ts b/apps/stage-tamagotchi/electron.vite.config.ts
index 27616f8db..246722613 100644
--- a/apps/stage-tamagotchi/electron.vite.config.ts
+++ b/apps/stage-tamagotchi/electron.vite.config.ts
@@ -73,13 +73,19 @@ export default defineConfig({
 
     plugins: [
       {
-        name: 'proj-airi:define-runtime-environment',
-        config() {
-          return {
-            define: {
-              'import.meta.env.RUNTIME_ENVIRONMENT': '\'electron\'',
-            },
+        name: 'proj-airi:defines',
+        config(ctx) {
+          const define: Record<string, any> = {
+            'import.meta.env.RUNTIME_ENVIRONMENT': '\'electron\'',
           }
+          if (ctx.mode === 'development') {
+            define['import.meta.env.URL_MODE'] = '\'server\''
+          }
+          if (ctx.mode === 'production') {
+            define['import.meta.env.URL_MODE'] = '\'file\''
+          }
+
+          return { define }
         },
       },
 
diff --git a/packages/stage-shared/src/environment.ts b/packages/stage-shared/src/environment.ts
index 70ad92040..61149b1c7 100644
--- a/packages/stage-shared/src/environment.ts
+++ b/packages/stage-shared/src/environment.ts
@@ -5,3 +5,11 @@ export function isStageWeb(): boolean {
 export function isStageTamagotchi(): boolean {
   return import.meta.env.RUNTIME_ENVIRONMENT === 'electron'
 }
+
+export function isUrlMode(mode: 'file' | 'server'): boolean {
+  if (!import.meta.env.URL_MODE) {
+    return mode === 'server'
+  }
+
+  return import.meta.env.URL_MODE === mode
+}
diff --git a/packages/stage-shared/src/url.ts b/packages/stage-shared/src/url.ts
index 185aa99e0..2d5fc6913 100644
--- a/packages/stage-shared/src/url.ts
+++ b/packages/stage-shared/src/url.ts
@@ -1,4 +1,4 @@
-import { isStageTamagotchi, isStageWeb } from './environment'
+import { isUrlMode } from './environment'
 
 export function isUrl(url: string) {
   try {
@@ -12,16 +12,13 @@ export function isUrl(url: string) {
 }
 
 export function withBase(url: string) {
-  if (isStageWeb()) {
+  if (isUrlMode('server')) {
     return url
   }
-  if (isStageTamagotchi()) {
-    return url.startsWith('/')
-      ? `.${url}`
-      : url.startsWith('./')
-        ? url
-        : `./${url}`
-  }
 
-  throw new Error('Unknown environment')
+  return url.startsWith('/')
+    ? `.${url}`
+    : url.startsWith('./')
+      ? url
+      : `./${url}`
 }