diff --git a/apps/stage-pocket/package.json b/apps/stage-pocket/package.json
index 02ceb8b14..6c2caeeff 100644
--- a/apps/stage-pocket/package.json
+++ b/apps/stage-pocket/package.json
@@ -37,6 +37,7 @@
     "@proj-airi/pipelines-audio": "workspace:^",
     "@proj-airi/server-sdk": "workspace:^",
     "@proj-airi/stage-layouts": "workspace:^",
+    "@proj-airi/stage-shared": "workspace:^",
     "@proj-airi/stage-ui": "workspace:^",
     "@proj-airi/stage-ui-three": "workspace:^",
     "@proj-airi/stage-ui-three-performance-runtime": "workspace:^",
diff --git a/apps/stage-pocket/src/main.ts b/apps/stage-pocket/src/main.ts
index 0a4d6602a..eed612f0a 100644
--- a/apps/stage-pocket/src/main.ts
+++ b/apps/stage-pocket/src/main.ts
@@ -5,6 +5,7 @@ import Tres from '@tresjs/core'
 import NProgress from 'nprogress'
 
 import { autoAnimatePlugin } from '@formkit/auto-animate/vue'
+import { isEnvTruthy } from '@proj-airi/stage-shared'
 import { MotionPlugin } from '@vueuse/motion'
 import { createPinia } from 'pinia'
 import { setupLayouts } from 'virtual:generated-layouts'
@@ -17,8 +18,6 @@ import App from './App.vue'
 import { i18n } from './modules/i18n'
 
 import './modules/posthog'
-
-// eslint-disable-next-line perfectionist/sort-imports
 import '@proj-airi/font-cjkfonts-allseto/index.css'
 import '@proj-airi/font-xiaolai/index.css'
 import '@unocss/reset/tailwind.css'
@@ -33,7 +32,7 @@ const pinia = createPinia()
 const routeRecords = setupLayouts(routes as RouteRecordRaw[])
 
 let router: Router
-if (import.meta.env.VITE_APP_TARGET_HUGGINGFACE_SPACE)
+if (isEnvTruthy(import.meta.env.VITE_APP_TARGET_HUGGINGFACE_SPACE))
   router = createRouter({ routes: routeRecords, history: createWebHashHistory() })
 else
   router = createRouter({ routes: routeRecords, history: createWebHistory() })
diff --git a/apps/stage-pocket/vite.config.ts b/apps/stage-pocket/vite.config.ts
index 112ab592e..662b38677 100644
--- a/apps/stage-pocket/vite.config.ts
+++ b/apps/stage-pocket/vite.config.ts
@@ -18,6 +18,7 @@ import VueDevTools from 'vite-plugin-vue-devtools'
 import Layouts from 'vite-plugin-vue-layouts'
 import VueMacros from 'vue-macros/vite'
 
+import { isEnvTruthy } from '@proj-airi/stage-shared'
 import { Download } from '@proj-airi/unplugin-fetch/vite'
 import { DownloadLive2DSDK } from '@proj-airi/unplugin-live2d-sdk/vite'
 import { templateCompilerOptions } from '@tresjs/core'
@@ -88,7 +89,7 @@ export default defineConfig({
   },
 
   plugins: [
-    .../^1|true|yes$/i.test(process.env.VITE_SKIP_MKCERT ?? '') ? [] : [mkcert()],
+    ...isEnvTruthy(process.env.VITE_SKIP_MKCERT ?? '') ? [] : [mkcert()],
 
     Info(),
 
@@ -145,7 +146,7 @@ export default defineConfig({
     Download('https://dist.ayaka.moe/vrm-models/VRoid-Hub/AvatarSample-A/AvatarSample_A.vrm', 'AvatarSample_A.vrm', 'vrm/models/AvatarSample-A', { parentDir: stageUIAssetsRoot, cacheDir: sharedCacheDir }),
     Download('https://dist.ayaka.moe/vrm-models/VRoid-Hub/AvatarSample-B/AvatarSample_B.vrm', 'AvatarSample_B.vrm', 'vrm/models/AvatarSample-B', { parentDir: stageUIAssetsRoot, cacheDir: sharedCacheDir }),
 
-    .../^1|true|yes$/i.test(process.env.VITE_CAP_SYNC_IOS_AFTER_BUILD ?? '')
+    ...isEnvTruthy(process.env.VITE_CAP_SYNC_IOS_AFTER_BUILD ?? '')
       ? [{
           name: 'proj-airi:capacitor-sync',
           closeBundle: {
diff --git a/apps/stage-web/src/main.ts b/apps/stage-web/src/main.ts
index 8dfe58c12..b7f7490d3 100644
--- a/apps/stage-web/src/main.ts
+++ b/apps/stage-web/src/main.ts
@@ -5,6 +5,7 @@ import Tres from '@tresjs/core'
 import NProgress from 'nprogress'
 
 import { autoAnimatePlugin } from '@formkit/auto-animate/vue'
+import { isEnvTruthy } from '@proj-airi/stage-shared'
 import { MotionPlugin } from '@vueuse/motion'
 import { createPinia } from 'pinia'
 import { setupLayouts } from 'virtual:generated-layouts'
@@ -17,8 +18,6 @@ import App from './App.vue'
 import { i18n } from './modules/i18n'
 
 import './modules/posthog'
-
-// eslint-disable-next-line perfectionist/sort-imports
 import '@proj-airi/font-cjkfonts-allseto/index.css'
 import '@proj-airi/font-xiaolai/index.css'
 import '@unocss/reset/tailwind.css'
@@ -33,7 +32,7 @@ const pinia = createPinia()
 const routeRecords = setupLayouts(routes as RouteRecordRaw[])
 
 let router: Router
-if (import.meta.env.VITE_APP_TARGET_HUGGINGFACE_SPACE)
+if (isEnvTruthy(import.meta.env.VITE_APP_TARGET_HUGGINGFACE_SPACE))
   router = createRouter({ routes: routeRecords, history: createWebHashHistory() })
 else
   router = createRouter({ routes: routeRecords, history: createWebHistory() })
diff --git a/apps/stage-web/src/stores/pwa.ts b/apps/stage-web/src/stores/pwa.ts
index 6f47a9965..c7032e9e1 100644
--- a/apps/stage-web/src/stores/pwa.ts
+++ b/apps/stage-web/src/stores/pwa.ts
@@ -1,3 +1,4 @@
+import { isEnvTruthy } from '@proj-airi/stage-shared'
 import { ToasterPWAUpdateReady } from '@proj-airi/stage-ui/components'
 import { breakpointsTailwind, useBreakpoints } from '@vueuse/core'
 import { nanoid } from 'nanoid'
@@ -14,7 +15,7 @@ export const usePWAStore = defineStore('pwa', () => {
     if (import.meta.env.SSR) {
       return
     }
-    if (import.meta.env.VITE_APP_TARGET_HUGGINGFACE_SPACE) {
+    if (isEnvTruthy(import.meta.env.VITE_APP_TARGET_HUGGINGFACE_SPACE)) {
       return
     }
 
diff --git a/packages/stage-shared/src/env-vars.ts b/packages/stage-shared/src/env-vars.ts
new file mode 100644
index 000000000..dd856c57b
--- /dev/null
+++ b/packages/stage-shared/src/env-vars.ts
@@ -0,0 +1,10 @@
+/**
+ * Returns true if the provided environment variable represents a truthy value.
+ *
+ * Truthy values: `true`, `t`, `yes`, `y`, `on`, `1`
+ */
+export function isEnvTruthy(value: string | undefined | null): boolean {
+  if (value == null)
+    return false
+  return /^(?:1|true|t|yes|y|on)$/i.test(value.trim())
+}
diff --git a/packages/stage-shared/src/index.ts b/packages/stage-shared/src/index.ts
index 703d7e71f..703d521fb 100644
--- a/packages/stage-shared/src/index.ts
+++ b/packages/stage-shared/src/index.ts
@@ -1,3 +1,4 @@
+export * from './env-vars'
 export * from './environment'
 export * from './export-csv'
 export * from './perf/tracer'
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 2720d2143..01f688ea8 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -568,6 +568,9 @@ importers:
       '@proj-airi/stage-layouts':
         specifier: workspace:^
         version: link:../../packages/stage-layouts
+      '@proj-airi/stage-shared':
+        specifier: workspace:^
+        version: link:../../packages/stage-shared
       '@proj-airi/stage-ui':
         specifier: workspace:^
         version: link:../../packages/stage-ui