diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
new file mode 100644
index 0000000..10e7193
--- /dev/null
+++ b/.github/workflows/ci.yaml
@@ -0,0 +1,30 @@
+# https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-nodejs
+name: CI
+
+on:
+  push:
+    branches: ['main']
+  pull_request:
+    branches: ['main']
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v7.0.0
+      - name: Install Node.js
+        uses: actions/setup-node@v6.4.0
+        with:
+          node-version: 22.20.0
+      - name: Install Dependencies
+        run: npm install --no-fund
+      - parallel:
+          - name: Typecheck
+            run: npm run test:types
+          - name: Lint
+            run: npm run lint
+          - name: Unit Test
+            run: npm run test:unit
+          - name: Build
+            run: npm run build
diff --git a/eslint.config.js b/eslint.config.js
new file mode 100644
index 0000000..7282254
--- /dev/null
+++ b/eslint.config.js
@@ -0,0 +1,68 @@
+import { defineConfig } from 'eslint/config';
+import globals from 'globals';
+import js from '@eslint/js';
+import tseslint from 'typescript-eslint';
+
+export default defineConfig([
+  tseslint.configs.recommended,
+  {
+    extends: [js.configs.recommended, ...tseslint.configs.recommended],
+    files: ['src/server/**/*.{ts,tsx,mjs,cjs,js}'],
+    languageOptions: {
+      ecmaVersion: 2023,
+      globals: globals.node,
+      parserOptions: {
+        project: ['./tools/tsconfig.server.json'],
+        tsconfigRootDir: import.meta.dirname,
+      },
+    },
+  },
+  {
+    extends: [js.configs.recommended, ...tseslint.configs.recommended],
+    files: ['src/shared/**/*.{ts,tsx,mjs,cjs,js}'],
+    languageOptions: {
+      ecmaVersion: 2023,
+      globals: globals.browser,
+      parserOptions: {
+        project: ['./tools/tsconfig.shared.json'],
+        tsconfigRootDir: import.meta.dirname,
+      },
+    },
+  },
+  {
+    extends: [js.configs.recommended, ...tseslint.configs.recommended],
+    files: ['src/client/**/*.{ts,tsx}'],
+    ignores: ['src/server/**/*.{ts,tsx}'],
+    languageOptions: {
+      ecmaVersion: 2023,
+      globals: globals.browser,
+      parserOptions: {
+        project: ['./tools/tsconfig.client.json'],
+        tsconfigRootDir: import.meta.dirname,
+      },
+    },
+  },
+  {
+    files: ['**/*.{js,mjs,cjs,ts,tsx}'],
+    rules: {
+      '@typescript-eslint/no-floating-promises': 'error',
+      '@typescript-eslint/no-unused-vars': ['off'],
+      'no-unused-vars': ['off'],
+    },
+    ignores: [
+      '**/node_modules/**',
+      '**/dist/**',
+      '**/build/**',
+      'eslint.config.js',
+      '**/vite.config.ts',
+      'devvit.config.ts',
+    ],
+    languageOptions: {
+      parserOptions: {
+        tsconfigRootDir: import.meta.dirname,
+      },
+    },
+    plugins: { js },
+    extends: ['js/recommended'],
+  },
+]);
diff --git a/package.json b/package.json
index b889b71..f20576c 100644
--- a/package.json
+++ b/package.json
@@ -6,13 +6,14 @@
   "type": "module",
   "scripts": {
     "build": "vite build",
-    "deploy": "npm run type-check && npm run lint && devvit upload",
+    "deploy": "npm run test:types && npm run lint && devvit upload",
     "dev": "devvit playtest",
     "launch": "npm run deploy && devvit publish",
     "lint": "eslint 'src/**/*.{ts,tsx}'",
     "login": "devvit login",
     "prettier": "prettier --write .",
-    "type-check": "tsc --build"
+    "test:types": "tsc --build",
+    "test:unit": "node --experimental-strip-types --no-warnings=ExperimentalWarning --test \"src/**/*.test.ts\""
   },
   "engines": {
     "node": ">=22.12.0"
@@ -30,7 +31,7 @@
     "eslint": "10.8.0",
     "globals": "17.8.0",
     "prettier": "3.9.6",
-    "typescript": "7.0.2",
+    "typescript": "6.0.3",
     "typescript-eslint": "8.65.0",
     "vite": "8.1.5"
   }