add: auto update launcher

src/main/preload.ts

@@ -9,7 +9,9 @@ export type Channels =
   | 'close-app'
   | 'minimize-app'
   | 'save-pack-config'
-  | 'load-pack-config';
+  | 'load-pack-config'
+  | 'update-available'
+  | 'install-update';
 
 const electronHandler = {
   ipcRenderer: {
@@ -28,7 +30,7 @@ const electronHandler = {
     once(channel: Channels, func: (...args: unknown[]) => void) {
       ipcRenderer.once(channel, (_event, ...args) => func(...args));
     },
-    invoke(channel: string, ...args: unknown[]) {
+    invoke(channel: Channels, ...args: unknown[]): Promise<any> {
       return ipcRenderer.invoke(channel, ...args);
     },
   },