Fix proxy this for emittery

.github/workflows/integration-test.yml

@@ -23,9 +23,9 @@ jobs:
         uses: actions/checkout@v3
 
       - name: Install nix
-        uses: cachix/install-nix-action@v19
+        uses: cachix/install-nix-action@v22
         with:
-          install_url: https://releases.nixos.org/nix/nix-2.13.3/install
+          install_url: https://releases.nixos.org/nix/nix-2.17.0/install
 
       - name: Set up cachix
         uses: cachix/cachix-action@v12

src/api/app-agent/websocket.ts

@@ -45,6 +45,15 @@ export class AppAgentWebsocket implements AppAgentClient {
     this.appWebsocket = appWebsocket;
     this.emitter = new Emittery<AppAgentEvents>();
 
+    // Ensure all super methods are bound to this instance because Emittery relies on `this` being the instance.
+    // Please retain until the upstream is fixed https://github.com/sindresorhus/emittery/issues/86.
+    Object.getOwnPropertyNames(Emittery.prototype).forEach((name) => {
+        const to_bind = (this.emitter as unknown as {[key: string]: unknown})[name];
+        if (typeof to_bind === 'function') {
+          (this.emitter as unknown as {[key: string]: unknown})[name] = to_bind.bind(this.emitter);
+        }
+    });
+
     const env = getLauncherEnvironment();
     this.installedAppId = env?.INSTALLED_APP_ID || installedAppId;
 

src/api/app/websocket.ts

@@ -59,6 +59,15 @@ export class AppWebsocket extends Emittery implements AppApi {
     overrideInstalledAppId?: InstalledAppId
   ) {
     super();
+    // Ensure all super methods are bound to this instance because Emittery relies on `this` being the instance.
+    // Please retain until the upstream is fixed https://github.com/sindresorhus/emittery/issues/86.
+    Object.getOwnPropertyNames(Emittery.prototype).forEach((name) => {
+      const to_bind = (this as unknown as {[key: string]: unknown})[name];
+      if (typeof to_bind === 'function') {
+        (this as unknown as {[key: string]: unknown})[name] = to_bind.bind(this);
+      }
+    });
+
     this.client = client;
     this.defaultTimeout =
       defaultTimeout === undefined ? DEFAULT_TIMEOUT : defaultTimeout;