diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8d0d2325..2f9a4a9a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,26 +11,24 @@ on:
     branches:
       - "*"
 jobs:
-  examples:
+  ci:
 
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
 
     strategy:
       matrix:
-        node-version: [20.x]
+        node-version: [22.x]
         architecture:
           - x64
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@v3
       with:
         submodules: true
     - name: Use Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v4
+      uses: actions/setup-node@v3
       with:
         node-version: ${{ matrix.node-version }}
-    # - name: Workaround for bad mirror
-    #   run: sudo gem install apt-spy2; sudo apt-spy2 check; sudo apt-spy2 fix --commit;
     - name: Update package repository
       run: sudo apt-get update; # sudo apt-get upgrade
     - name: Install dependencies
@@ -40,36 +38,11 @@ jobs:
     - run: gjs --version
     - run: yarn install
     - run: yarn build
-    - run: yarn build:examples
-    - run: yarn validate:examples
-    - run: yarn test:examples:cli-apps
-
-  gjs-types-all:
-
-    runs-on: ubuntu-22.04
-
-    strategy:
-      matrix:
-        node-version: [20.x]
-        architecture:
-          - x64
-    steps:
-    - name: Checkout repository
-      uses: actions/checkout@v3
-      with:
-        submodules: true
-    - name: Use Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v3
-      with:
-        node-version: ${{ matrix.node-version }}
-    - name: Update package repository
-      run: sudo apt-get update; # sudo apt-get upgrade
-    - name: Install dependencies
-      run: sudo apt-get --yes install gjs libappindicator3-dev libgda-5.0-dev libgirepository1.0-dev libgtk-3-dev libgtk-4-dev libgtksourceview-3.0-dev libnotify-dev libsoup2.4-dev libsoup-3.0-dev libwebkit2gtk-4.0-dev libadwaita-1-dev gnome-shell-common libmutter-10-dev libgcr-3-dev libgnome-desktop-3-dev build-essential gobject-introspection libgirepository1.0-dev libcairo2-dev
-    - run: yarn install
-    - run: yarn build
     - run: yarn build:types:packages
     - name: Show diff
       run: (cd ./types && git diff | cat)
     - run: yarn validate:types:packages
-    - run: yarn test:tests
\ No newline at end of file
+    - run: yarn test:tests
+    - run: yarn build:examples
+    - run: yarn validate:examples
+    - run: yarn test:examples:cli-apps
\ No newline at end of file
diff --git a/examples/gio-2-cat/main.ts b/examples/gio-2-cat/main.ts
index 86e181e6..c291a912 100644
--- a/examples/gio-2-cat/main.ts
+++ b/examples/gio-2-cat/main.ts
@@ -11,33 +11,37 @@
  * the label should show a translation of 'Print help'
  */
 
-import '@girs/gjs';
-import '@girs/gjs/dom';
-import GLib from '@girs/glib-2.0';
-import Gio from '@girs/gio-2.0';
+import '@girs/gjs'
+import '@girs/gjs/dom'
+import GLib from '@girs/glib-2.0'
+import Gio from '@girs/gio-2.0'
 
-const loop = GLib.MainLoop.new(null, false);
+const loop = GLib.MainLoop.new(null, false)
 const textDecoder = new TextDecoder()
 
 function cat(filename: string) {
-    const file = Gio.file_new_for_path(filename);
+    const file = Gio.file_new_for_path(filename)
+
     file.load_contents_async(null, (obj, res) => {
-        let contents: Uint8Array;
+        let contents: Uint8Array
         try {
-            contents = obj!.load_contents_finish(res)![1];
+            contents = obj!.load_contents_finish(res)![1]
         } catch (e) {
-            logError(e);
-            loop.quit();
-            return;
+            logError(e)
+            loop.quit()
+            return
         }
-        print(textDecoder.decode(contents));
-        loop.quit();
-    });
+        print(textDecoder.decode(contents))
+        loop.quit()
+    })
+
+    // Tests instanceof, see https://github.com/gjsify/ts-for-gir/issues/195
+    if (!(file instanceof Gio.File)) {
+        throw new Error('file is not an instance of Gio.File')
+    }
 
-    loop.run();
+    loop.run()
 }
 
-if (ARGV.length !== 1)
-    printerr('Usage: gio-cat.js filename');
-else
-    cat(ARGV[0]);
+if (ARGV.length !== 1) printerr('Usage: gio-cat.js filename')
+else cat(ARGV[0])
diff --git a/packages/generator-typescript/src/module-generator.ts b/packages/generator-typescript/src/module-generator.ts
index 8f24e347..d77a20b4 100644
--- a/packages/generator-typescript/src/module-generator.ts
+++ b/packages/generator-typescript/src/module-generator.ts
@@ -217,7 +217,11 @@ export class ModuleGenerator extends FormatGenerator<string[]> {
         ]
     }
     generateInterfaceDeclaration(node: IntrospectedInterface): string[] {
-        return [`\n\nexport const ${node.name}: ${node.name}Namespace;\n`]
+        return [
+            `\n\nexport const ${node.name}: ${node.name}Namespace & {
+        new (): ${node.name} // This allows \`obj instanceof ${node.name}\`
+    }\n`,
+        ]
     }
     generateError(node: IntrospectedError): string[] {
         const { namespace } = this
diff --git a/packages/generator-typescript/templates/tsconfig.json b/packages/generator-typescript/templates/tsconfig.json
index 0744895f..6ec1194a 100644
--- a/packages/generator-typescript/templates/tsconfig.json
+++ b/packages/generator-typescript/templates/tsconfig.json
@@ -24,7 +24,9 @@ _%>
     "removeComments": false,
     "inlineSourceMap": false,
     "inlineSources": false,
-    "newLine": "LF"
+    "newLine": "LF",
+    // Show diagnostics
+    "diagnostics": true
   },
   "include": <%- JSON.stringify(includes) %>
 }