Finalize statsig example (#1095)

### Description

<!--
✍️ Write a short summary of your work. Screenshots and videos are
welcome!
-->

### Demo URL

<!--
Provide a URL to a live deployment where we can test your PR. If a demo
isn't possible feel free to omit this section.
-->

### Type of Change

- [ ] New Example
- [ ] Example updates (Bug fixes, new features, etc.)
- [ ] Other (changes to the codebase, but not to examples)

### New Example Checklist

- [ ] 🛫 `npm run new-example` was used to create the example
- [ ] 📚 The template wasn't used but I carefuly read the [Adding a new
example](https://github.com/vercel/examples#adding-a-new-example) steps
and implemented them in the example
- [ ] 📱 Is it responsive? Are mobile and tablets considered?

---------

Co-authored-by: Dominik Ferber <[email protected]>

flags-sdk/experimentation-statsig/.eslintrc.json

@@ -1,11 +1,3 @@
 {
-  "root": true,
-  "extends": "next/core-web-vitals",
-  "rules": {
-    "@typescript-eslint/require-await": "off",
-    "@typescript-eslint/no-misused-promises": "off",
-    "import/order": "off",
-    "camelcase": "off",
-    "no-console": "off"
-  }
-}
+  "extends": "next/core-web-vitals"
+}

flags-sdk/experimentation-statsig/README.md

@@ -47,14 +47,16 @@ vercel env pull
 
 Head over to the [Statsig Console](console.statsig.com) and create the two feature flags under Feature Gates:
 
-- `Summer Sale` with the gate id `summer_sale`
-- `Free Shipping` with the gate id `free_delivery`
+- `Summer Sale` with the gate id `summer_sale`, targeting the `Stable ID`
+- `Free Shipping` with the gate id `free_delivery`, targeting the `Stable ID`
+
+Note: please make sure you select the `Stable ID` instead of the `User ID` which is selected by default.
 
 You can also find the gate ids in the `flags.ts` file.
 
 ### Step 4: Configure the Feature Gates
 
-Select the `Free Delivery` and `Free Shipping` feature gates and configure them on the Statsig Console.
+Select the `Summer Sale` and `Free Shipping` feature gates and configure them on the Statsig Console.
 
 Create a new rule by clicking on "+ Add New Rule" and set the percentage to 50%.
 

flags-sdk/experimentation-statsig/flags.ts

@@ -1,5 +1,5 @@
 import { statsigAdapter, type StatsigUser } from "@flags-sdk/statsig";
-import { Identify } from "flags";
+import type { Identify } from "flags";
 import { dedupe, flag } from "flags/next";
 import { getStableId } from "./utils/get-stable-id";
 

flags-sdk/experimentation-statsig/package.json

@@ -34,6 +34,7 @@
     "@types/react": "^19.0.10",
     "@types/react-dom": "^19.0.4",
     "eslint": "^9.21.0",
+    "eslint-config-next": "^15.2.0",
     "postcss": "^8.5.3",
     "tailwindcss": "^4.0.8",
     "typescript": "^5.7.3"