diff --git a/examples/logjam/package.json b/examples/logjam/package.json
new file mode 100644
index 0000000..8a00d33
--- /dev/null
+++ b/examples/logjam/package.json
@@ -0,0 +1,24 @@
+{
+  "name": "logjam",
+  "version": "1.0.0",
+  "type": "module",
+  "scripts": {
+    "start": "vitest --ui",
+    "test": "vitest"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/stevekinney/testing-javascript.git"
+  },
+  "author": "Steve Kinney <hello@stevekinney.net>",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/stevekinney/testing-javascript/issues"
+  },
+  "homepage": "https://github.com/stevekinney/testing-javascript#readme",
+  "devDependencies": {
+    "@vitest/ui": "^2.1.1",
+    "vite": "^5.4.5",
+    "vitest": "^2.1.1"
+  }
+}
diff --git a/examples/logjam/src/log.js b/examples/logjam/src/log.js
new file mode 100644
index 0000000..37eca0d
--- /dev/null
+++ b/examples/logjam/src/log.js
@@ -0,0 +1,19 @@
+/// <reference types="vite/client" />
+
+export function log(...args) {
+  if (import.meta.env.MODE !== 'production') {
+    console.log(...args);
+  }
+}
+
+log.error = function error(...args) {
+  if (import.meta.env.MODE !== 'production') {
+    console.log(...args);
+  }
+};
+
+log.warn = function warn(...args) {
+  if (import.meta.env.MODE !== 'production') {
+    console.warn(...args);
+  }
+};
diff --git a/examples/logjam/src/log.test.js b/examples/logjam/src/log.test.js
new file mode 100644
index 0000000..35d5a82
--- /dev/null
+++ b/examples/logjam/src/log.test.js
@@ -0,0 +1,14 @@
+import { expect, it, vi, beforeEach, afterEach, describe } from 'vitest';
+import { log } from './log';
+
+describe.todo('logger', () => {
+  it('logs to the console in development mode', () => {
+    const spy = vi.spyOn(console, 'log');
+
+    log('Hello, world!');
+
+    expect(spy).toHaveBeenCalledWith('Hello, world!');
+
+    spy.mockRestore();
+  });
+});
diff --git a/package-lock.json b/package-lock.json
index bdf6703..3259b87 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -21,7 +21,8 @@
         "examples/scratchpad",
         "examples/utility-belt",
         "examples/strictly-speaking",
-        "examples/button-factory"
+        "examples/button-factory",
+        "examples/logjam"
       ],
       "devDependencies": {
         "prettier": "^3.3.3",
@@ -128,6 +129,11 @@
         "url": "https://github.com/chalk/chalk?sponsor=1"
       }
     },
+    "examples/logjam": {
+      "version": "1.0.0",
+      "license": "ISC",
+      "devDependencies": {}
+    },
     "examples/scratchpad": {
       "extraneous": true
     },
@@ -3308,6 +3314,10 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/logjam": {
+      "resolved": "examples/logjam",
+      "link": true
+    },
     "node_modules/loose-envify": {
       "version": "1.4.0",
       "license": "MIT",
diff --git a/package.json b/package.json
index 37b50d7..6b920b1 100644
--- a/package.json
+++ b/package.json
@@ -38,7 +38,8 @@
     "examples/scratchpad",
     "examples/utility-belt",
     "examples/strictly-speaking",
-    "examples/button-factory"
+    "examples/button-factory",
+    "examples/logjam"
   ],
   "devDependencies": {
     "prettier": "^3.3.3",
diff --git a/types.d.ts b/types.d.ts
new file mode 100644
index 0000000..11f02fe
--- /dev/null
+++ b/types.d.ts
@@ -0,0 +1 @@
+/// <reference types="vite/client" />