From cd7afb6abd9cd62f56d639e56fa6d55baa69fe7f Mon Sep 17 00:00:00 2001
From: Makito <i@maki.to>
Date: Thu, 23 Oct 2025 00:22:38 +0900
Subject: [PATCH] feat(stage-tamagotchi): unified preload expose

---
 apps/stage-tamagotchi/src/preload/index.ts  | 27 ++-------------------
 apps/stage-tamagotchi/src/preload/shared.ts | 27 +++++++++++++++++++++
 packages/stage-shared/src/window.ts         |  6 ++---
 3 files changed, 32 insertions(+), 28 deletions(-)
 create mode 100644 apps/stage-tamagotchi/src/preload/shared.ts

diff --git a/apps/stage-tamagotchi/src/preload/index.ts b/apps/stage-tamagotchi/src/preload/index.ts
index 43b009209..ebaf15783 100644
--- a/apps/stage-tamagotchi/src/preload/index.ts
+++ b/apps/stage-tamagotchi/src/preload/index.ts
@@ -1,26 +1,3 @@
-import { contextIsolated, platform } from 'node:process'
+import { expose } from './shared'
 
-import { electronAPI } from '@electron-toolkit/preload'
-import { contextBridge } from 'electron'
-
-// Custom APIs for renderer
-const api = {}
-
-// Use `contextBridge` APIs to expose Electron APIs to
-// renderer only if context isolation is enabled, otherwise
-// just add to the DOM global.
-if (contextIsolated) {
-  try {
-    contextBridge.exposeInMainWorld('electron', electronAPI)
-    contextBridge.exposeInMainWorld('platform', platform)
-    contextBridge.exposeInMainWorld('api', api)
-  }
-  catch (error) {
-    console.error(error)
-  }
-}
-else {
-  window.electron = electronAPI
-  window.platform = platform
-  window.api = api
-}
+expose()
diff --git a/apps/stage-tamagotchi/src/preload/shared.ts b/apps/stage-tamagotchi/src/preload/shared.ts
new file mode 100644
index 000000000..a6fa91646
--- /dev/null
+++ b/apps/stage-tamagotchi/src/preload/shared.ts
@@ -0,0 +1,27 @@
+import type { ElectronWindow } from '@proj-airi/stage-shared'
+
+import { contextIsolated, platform } from 'node:process'
+
+import { electronAPI } from '@electron-toolkit/preload'
+import { contextBridge } from 'electron'
+
+export function expose<CustomApi = unknown>(customApi: CustomApi = undefined as CustomApi) {
+  // Use `contextBridge` APIs to expose Electron APIs to
+  // renderer only if context isolation is enabled, otherwise
+  // just add to the DOM global.
+  if (contextIsolated) {
+    try {
+      contextBridge.exposeInMainWorld('electron', electronAPI)
+      contextBridge.exposeInMainWorld('platform', platform)
+      contextBridge.exposeInMainWorld('api', customApi)
+    }
+    catch (error) {
+      console.error(error)
+    }
+  }
+  else {
+    window.electron = electronAPI
+    window.platform = platform
+    ;(window as ElectronWindow<CustomApi>).api = customApi
+  }
+}
diff --git a/packages/stage-shared/src/window.ts b/packages/stage-shared/src/window.ts
index 483424cb2..80cf736ff 100644
--- a/packages/stage-shared/src/window.ts
+++ b/packages/stage-shared/src/window.ts
@@ -2,12 +2,12 @@ import type { ElectronAPI } from '@electron-toolkit/preload'
 
 import { isStageTamagotchi } from './environment'
 
-export interface ElectronWindow {
+export interface ElectronWindow<CustomApi = unknown> {
   electron: ElectronAPI
   platform: NodeJS.Platform
-  api: unknown
+  api: CustomApi
 }
 
-export function isElectronWindow(window: Window): window is (Window & ElectronWindow) {
+export function isElectronWindow<CustomApi = unknown>(window: Window): window is (Window & ElectronWindow<CustomApi>) {
   return isStageTamagotchi() && typeof window === 'object' && window !== null && 'electron' in window
 }