diff --git a/.github/workflows/pull-request.yml b/.github/workflows/pull-request.yml
index bc85eeee8..e6a8c4a08 100644
--- a/.github/workflows/pull-request.yml
+++ b/.github/workflows/pull-request.yml
@@ -1,15 +1,49 @@
-name: Test
+name: Pull Request
 on: [pull_request]
 jobs:
-  build:
+  Format:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Setup node
+        uses: actions/setup-node@v4
         with:
           node-version-file: ".node-version"
           cache: yarn
-      - run: yarn
-      - run: yarn build:res --warn-error +3+8+11+12+26+27+31+32+33+34+35+39+44+45+110
-      - run: yarn test
-      - run: yarn ci:format
+      - name: Install dependencies
+        run: yarn
+      - name: Format check
+        run: yarn ci:format
+  Site_Checks:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Setup node
+        uses: actions/setup-node@v4
+        with:
+          node-version-file: ".node-version"
+          cache: yarn
+      - name: Install dependencies
+        run: yarn
+      - name: Test examples and hrefs
+        run: yarn test
+  Vitest:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Setup node
+        uses: actions/setup-node@v4
+        with:
+          node-version-file: ".node-version"
+          cache: yarn
+      - name: Install dependencies
+        run: yarn
+      - name: Build ReScript
+        run: yarn build:res
+      - name: Install Playwright
+        run: yarn playwright install --with-deps
+      - name: Vitest
+        run: yarn ci:test
diff --git a/.gitignore b/.gitignore
index 522b8342c..59dc8d7ad 100644
--- a/.gitignore
+++ b/.gitignore
@@ -48,6 +48,8 @@ app/**/*.mjs
 app/**/*.jsx
 functions/**/*.mjs
 functions/**/*.jsx
+__tests__/**/*.mjs
+__tests__/**/*.jsx
 !_shims.mjs
 !_shims.jsx
 
diff --git a/__tests__/Example.test.res b/__tests__/Example.test.res
new file mode 100644
index 000000000..df140a2db
--- /dev/null
+++ b/__tests__/Example.test.res
@@ -0,0 +1,28 @@
+open Vitest
+
+module Example = {
+  @react.component
+  let make = (~handleClick) =>
+    <div>
+      <button onClick=handleClick> {React.string("testing")} </button>
+    </div>
+}
+
+test("basic assertions", async () => {
+  expect("foo")->toBe("foo")
+
+  expect(true)->toBe(true)
+})
+
+test("component rendering", async () => {
+  let callback = fn()
+  let screen = await render(<Example handleClick=callback />)
+
+  await element(screen->getByText("testing"))->toBeVisible
+
+  let button = await screen->getByRole(#button)
+
+  await button->click
+
+  expect(callback)->toHaveBeenCalled
+})
diff --git a/package.json b/package.json
index 732a8f3a5..39407f269 100644
--- a/package.json
+++ b/package.json
@@ -12,12 +12,13 @@
   "scripts": {
     "build:scripts": "yarn dlx tsdown@0.20.0 scripts/*.jsx -d _scripts --no-clean --ext .mjs",
     "build:generate-llms": "node _scripts/generate_llms.mjs",
-    "build:res": "rescript build",
+    "build:res": "rescript build --warn-error +3+8+11+12+26+27+31+32+33+34+35+39+44+45+110",
     "build:sync-bundles": "node scripts/sync-playground-bundles.mjs",
     "build:update-index": "yarn build:generate-llms && node _scripts/generate_feed.mjs > public/blog/feed.xml",
     "build:vite": "react-router build",
     "build": "yarn build:res && yarn build:scripts && yarn build:update-index && yarn build:vite",
     "ci:format": "prettier . --check --experimental-cli",
+    "ci:test": "yarn vitest --run --browser.headless",
     "clean:res": "rescript clean",
     "convert-images": "auto-convert-images",
     "dev:res": "rescript watch",
@@ -28,7 +29,8 @@
     "prepare": "yarn build:res && yarn build:scripts && yarn build:update-index",
     "preview": "yarn build && static-server build/client",
     "reanalyze": "rescript-tools reanalyze -all-cmt .",
-    "test": "node scripts/test-examples.mjs && node scripts/test-hrefs.mjs"
+    "test": "node scripts/test-examples.mjs && node scripts/test-hrefs.mjs",
+    "vitest": "vitest"
   },
   "dependencies": {
     "@babel/generator": "^7.24.7",
@@ -84,12 +86,14 @@
     "@tailwindcss/vite": "^4.1.13",
     "@types/react": "^19.2.2",
     "@vitejs/plugin-react": "^4.7.0",
+    "@vitest/browser-playwright": "^4.0.18",
     "auto-image-converter": "^2.1.2",
     "chokidar": "^4.0.3",
     "dotenv": "^16.4.7",
     "jsdom": "^26.1.0",
     "lefthook": "^2.0.4",
     "lightningcss": "^1.30.1",
+    "playwright": "^1.58.2",
     "prettier": "^3.6.2",
     "remark-cli": "^12.0.1",
     "search-insights": "^2.17.3",
@@ -100,6 +104,8 @@
     "vite-plugin-devtools-json": "^1.0.0",
     "vite-plugin-env-compatible": "^2.0.1",
     "vite-plugin-page-reload": "^0.2.2",
+    "vitest": "^4.0.18",
+    "vitest-browser-react": "^2.0.5",
     "wrangler": "^4.63.0"
   }
 }
diff --git a/rescript.json b/rescript.json
index 2e776585b..9214ceafd 100644
--- a/rescript.json
+++ b/rescript.json
@@ -8,6 +8,11 @@
   "dependencies": ["@rescript/react", "@rescript/webapi"],
   "compiler-flags": ["-open WebAPI.Global"],
   "sources": [
+    {
+      "dir": "__tests__",
+      "subdirs": true,
+      "type": "dev"
+    },
     {
       "dir": "app",
       "subdirs": true
diff --git a/src/bindings/Vitest.res b/src/bindings/Vitest.res
new file mode 100644
index 000000000..0c151148e
--- /dev/null
+++ b/src/bindings/Vitest.res
@@ -0,0 +1,56 @@
+type page
+type expect
+type screen
+type element
+type mock
+
+/**
+ * Vitest
+ */
+@module("vitest")
+external test: (string, unit => promise<unit>) => unit = "test"
+
+@module("vitest") @scope("vi")
+external fn: unit => 'a => 'b = "fn"
+
+@module("vitest")
+external expect: 'a => expect = "expect"
+
+/**
+ * vitest-browser-react
+ */
+@module("vitest-browser-react")
+external render: Jsx.element => promise<screen> = "render"
+
+@module("vitest") @scope("expect")
+external element: 'a => element = "element"
+
+/*
+ * Locators
+ */
+@send
+external getByText: (screen, string) => element = "getByText"
+
+@send
+external getByRole: (screen, [#button]) => promise<element> = "getByRole"
+
+/**
+ * Actions
+ */
+@send
+external click: element => promise<unit> = "click"
+
+/**
+ * Vitest assertions
+ */
+@send
+external toBe: (expect, 'a) => unit = "toBe"
+
+@send
+external toHaveBeenCalled: expect => unit = "toHaveBeenCalled"
+
+/**
+ * Browser assertions
+ */
+@send
+external toBeVisible: element => promise<unit> = "toBeVisible"
diff --git a/vitest.config.js b/vitest.config.js
new file mode 100644
index 000000000..18eb0da85
--- /dev/null
+++ b/vitest.config.js
@@ -0,0 +1,16 @@
+import { defineConfig } from "vitest/config";
+import { playwright } from "@vitest/browser-playwright";
+import react from "@vitejs/plugin-react";
+
+export default defineConfig({
+  plugins: [react()],
+  test: {
+    include: ["__tests__/*.jsx"],
+    browser: {
+      enabled: true,
+      provider: playwright(),
+      // https://vitest.dev/config/browser/playwright
+      instances: [{ browser: "chromium" }],
+    },
+  },
+});
diff --git a/yarn.lock b/yarn.lock
index af266062f..3e1dab845 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -909,6 +909,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@esbuild/aix-ppc64@npm:0.27.3":
+  version: 0.27.3
+  resolution: "@esbuild/aix-ppc64@npm:0.27.3"
+  conditions: os=aix & cpu=ppc64
+  languageName: node
+  linkType: hard
+
 "@esbuild/android-arm64@npm:0.25.12":
   version: 0.25.12
   resolution: "@esbuild/android-arm64@npm:0.25.12"
@@ -923,6 +930,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@esbuild/android-arm64@npm:0.27.3":
+  version: 0.27.3
+  resolution: "@esbuild/android-arm64@npm:0.27.3"
+  conditions: os=android & cpu=arm64
+  languageName: node
+  linkType: hard
+
 "@esbuild/android-arm@npm:0.25.12":
   version: 0.25.12
   resolution: "@esbuild/android-arm@npm:0.25.12"
@@ -937,6 +951,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@esbuild/android-arm@npm:0.27.3":
+  version: 0.27.3
+  resolution: "@esbuild/android-arm@npm:0.27.3"
+  conditions: os=android & cpu=arm
+  languageName: node
+  linkType: hard
+
 "@esbuild/android-x64@npm:0.25.12":
   version: 0.25.12
   resolution: "@esbuild/android-x64@npm:0.25.12"
@@ -951,6 +972,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@esbuild/android-x64@npm:0.27.3":
+  version: 0.27.3
+  resolution: "@esbuild/android-x64@npm:0.27.3"
+  conditions: os=android & cpu=x64
+  languageName: node
+  linkType: hard
+
 "@esbuild/darwin-arm64@npm:0.25.12":
   version: 0.25.12
   resolution: "@esbuild/darwin-arm64@npm:0.25.12"
@@ -965,6 +993,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@esbuild/darwin-arm64@npm:0.27.3":
+  version: 0.27.3
+  resolution: "@esbuild/darwin-arm64@npm:0.27.3"
+  conditions: os=darwin & cpu=arm64
+  languageName: node
+  linkType: hard
+
 "@esbuild/darwin-x64@npm:0.25.12":
   version: 0.25.12
   resolution: "@esbuild/darwin-x64@npm:0.25.12"
@@ -979,6 +1014,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@esbuild/darwin-x64@npm:0.27.3":
+  version: 0.27.3
+  resolution: "@esbuild/darwin-x64@npm:0.27.3"
+  conditions: os=darwin & cpu=x64
+  languageName: node
+  linkType: hard
+
 "@esbuild/freebsd-arm64@npm:0.25.12":
   version: 0.25.12
   resolution: "@esbuild/freebsd-arm64@npm:0.25.12"
@@ -993,6 +1035,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@esbuild/freebsd-arm64@npm:0.27.3":
+  version: 0.27.3
+  resolution: "@esbuild/freebsd-arm64@npm:0.27.3"
+  conditions: os=freebsd & cpu=arm64
+  languageName: node
+  linkType: hard
+
 "@esbuild/freebsd-x64@npm:0.25.12":
   version: 0.25.12
   resolution: "@esbuild/freebsd-x64@npm:0.25.12"
@@ -1007,6 +1056,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@esbuild/freebsd-x64@npm:0.27.3":
+  version: 0.27.3
+  resolution: "@esbuild/freebsd-x64@npm:0.27.3"
+  conditions: os=freebsd & cpu=x64
+  languageName: node
+  linkType: hard
+
 "@esbuild/linux-arm64@npm:0.25.12":
   version: 0.25.12
   resolution: "@esbuild/linux-arm64@npm:0.25.12"
@@ -1021,6 +1077,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@esbuild/linux-arm64@npm:0.27.3":
+  version: 0.27.3
+  resolution: "@esbuild/linux-arm64@npm:0.27.3"
+  conditions: os=linux & cpu=arm64
+  languageName: node
+  linkType: hard
+
 "@esbuild/linux-arm@npm:0.25.12":
   version: 0.25.12
   resolution: "@esbuild/linux-arm@npm:0.25.12"
@@ -1035,6 +1098,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@esbuild/linux-arm@npm:0.27.3":
+  version: 0.27.3
+  resolution: "@esbuild/linux-arm@npm:0.27.3"
+  conditions: os=linux & cpu=arm
+  languageName: node
+  linkType: hard
+
 "@esbuild/linux-ia32@npm:0.25.12":
   version: 0.25.12
   resolution: "@esbuild/linux-ia32@npm:0.25.12"
@@ -1049,6 +1119,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@esbuild/linux-ia32@npm:0.27.3":
+  version: 0.27.3
+  resolution: "@esbuild/linux-ia32@npm:0.27.3"
+  conditions: os=linux & cpu=ia32
+  languageName: node
+  linkType: hard
+
 "@esbuild/linux-loong64@npm:0.25.12":
   version: 0.25.12
   resolution: "@esbuild/linux-loong64@npm:0.25.12"
@@ -1063,6 +1140,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@esbuild/linux-loong64@npm:0.27.3":
+  version: 0.27.3
+  resolution: "@esbuild/linux-loong64@npm:0.27.3"
+  conditions: os=linux & cpu=loong64
+  languageName: node
+  linkType: hard
+
 "@esbuild/linux-mips64el@npm:0.25.12":
   version: 0.25.12
   resolution: "@esbuild/linux-mips64el@npm:0.25.12"
@@ -1077,6 +1161,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@esbuild/linux-mips64el@npm:0.27.3":
+  version: 0.27.3
+  resolution: "@esbuild/linux-mips64el@npm:0.27.3"
+  conditions: os=linux & cpu=mips64el
+  languageName: node
+  linkType: hard
+
 "@esbuild/linux-ppc64@npm:0.25.12":
   version: 0.25.12
   resolution: "@esbuild/linux-ppc64@npm:0.25.12"
@@ -1091,6 +1182,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@esbuild/linux-ppc64@npm:0.27.3":
+  version: 0.27.3
+  resolution: "@esbuild/linux-ppc64@npm:0.27.3"
+  conditions: os=linux & cpu=ppc64
+  languageName: node
+  linkType: hard
+
 "@esbuild/linux-riscv64@npm:0.25.12":
   version: 0.25.12
   resolution: "@esbuild/linux-riscv64@npm:0.25.12"
@@ -1105,6 +1203,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@esbuild/linux-riscv64@npm:0.27.3":
+  version: 0.27.3
+  resolution: "@esbuild/linux-riscv64@npm:0.27.3"
+  conditions: os=linux & cpu=riscv64
+  languageName: node
+  linkType: hard
+
 "@esbuild/linux-s390x@npm:0.25.12":
   version: 0.25.12
   resolution: "@esbuild/linux-s390x@npm:0.25.12"
@@ -1119,6 +1224,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@esbuild/linux-s390x@npm:0.27.3":
+  version: 0.27.3
+  resolution: "@esbuild/linux-s390x@npm:0.27.3"
+  conditions: os=linux & cpu=s390x
+  languageName: node
+  linkType: hard
+
 "@esbuild/linux-x64@npm:0.25.12":
   version: 0.25.12
   resolution: "@esbuild/linux-x64@npm:0.25.12"
@@ -1133,6 +1245,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@esbuild/linux-x64@npm:0.27.3":
+  version: 0.27.3
+  resolution: "@esbuild/linux-x64@npm:0.27.3"
+  conditions: os=linux & cpu=x64
+  languageName: node
+  linkType: hard
+
 "@esbuild/netbsd-arm64@npm:0.25.12":
   version: 0.25.12
   resolution: "@esbuild/netbsd-arm64@npm:0.25.12"
@@ -1147,6 +1266,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@esbuild/netbsd-arm64@npm:0.27.3":
+  version: 0.27.3
+  resolution: "@esbuild/netbsd-arm64@npm:0.27.3"
+  conditions: os=netbsd & cpu=arm64
+  languageName: node
+  linkType: hard
+
 "@esbuild/netbsd-x64@npm:0.25.12":
   version: 0.25.12
   resolution: "@esbuild/netbsd-x64@npm:0.25.12"
@@ -1161,6 +1287,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@esbuild/netbsd-x64@npm:0.27.3":
+  version: 0.27.3
+  resolution: "@esbuild/netbsd-x64@npm:0.27.3"
+  conditions: os=netbsd & cpu=x64
+  languageName: node
+  linkType: hard
+
 "@esbuild/openbsd-arm64@npm:0.25.12":
   version: 0.25.12
   resolution: "@esbuild/openbsd-arm64@npm:0.25.12"
@@ -1175,6 +1308,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@esbuild/openbsd-arm64@npm:0.27.3":
+  version: 0.27.3
+  resolution: "@esbuild/openbsd-arm64@npm:0.27.3"
+  conditions: os=openbsd & cpu=arm64
+  languageName: node
+  linkType: hard
+
 "@esbuild/openbsd-x64@npm:0.25.12":
   version: 0.25.12
   resolution: "@esbuild/openbsd-x64@npm:0.25.12"
@@ -1189,6 +1329,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@esbuild/openbsd-x64@npm:0.27.3":
+  version: 0.27.3
+  resolution: "@esbuild/openbsd-x64@npm:0.27.3"
+  conditions: os=openbsd & cpu=x64
+  languageName: node
+  linkType: hard
+
 "@esbuild/openharmony-arm64@npm:0.25.12":
   version: 0.25.12
   resolution: "@esbuild/openharmony-arm64@npm:0.25.12"
@@ -1203,6 +1350,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@esbuild/openharmony-arm64@npm:0.27.3":
+  version: 0.27.3
+  resolution: "@esbuild/openharmony-arm64@npm:0.27.3"
+  conditions: os=openharmony & cpu=arm64
+  languageName: node
+  linkType: hard
+
 "@esbuild/sunos-x64@npm:0.25.12":
   version: 0.25.12
   resolution: "@esbuild/sunos-x64@npm:0.25.12"
@@ -1217,6 +1371,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@esbuild/sunos-x64@npm:0.27.3":
+  version: 0.27.3
+  resolution: "@esbuild/sunos-x64@npm:0.27.3"
+  conditions: os=sunos & cpu=x64
+  languageName: node
+  linkType: hard
+
 "@esbuild/win32-arm64@npm:0.25.12":
   version: 0.25.12
   resolution: "@esbuild/win32-arm64@npm:0.25.12"
@@ -1231,6 +1392,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@esbuild/win32-arm64@npm:0.27.3":
+  version: 0.27.3
+  resolution: "@esbuild/win32-arm64@npm:0.27.3"
+  conditions: os=win32 & cpu=arm64
+  languageName: node
+  linkType: hard
+
 "@esbuild/win32-ia32@npm:0.25.12":
   version: 0.25.12
   resolution: "@esbuild/win32-ia32@npm:0.25.12"
@@ -1245,6 +1413,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@esbuild/win32-ia32@npm:0.27.3":
+  version: 0.27.3
+  resolution: "@esbuild/win32-ia32@npm:0.27.3"
+  conditions: os=win32 & cpu=ia32
+  languageName: node
+  linkType: hard
+
 "@esbuild/win32-x64@npm:0.25.12":
   version: 0.25.12
   resolution: "@esbuild/win32-x64@npm:0.25.12"
@@ -1259,6 +1434,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@esbuild/win32-x64@npm:0.27.3":
+  version: 0.27.3
+  resolution: "@esbuild/win32-x64@npm:0.27.3"
+  conditions: os=win32 & cpu=x64
+  languageName: node
+  linkType: hard
+
 "@fastify/accept-negotiator@npm:^2.0.0":
   version: 2.0.1
   resolution: "@fastify/accept-negotiator@npm:2.0.1"
@@ -2251,6 +2433,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@polka/url@npm:^1.0.0-next.24":
+  version: 1.0.0-next.29
+  resolution: "@polka/url@npm:1.0.0-next.29"
+  checksum: 10c0/0d58e081844095cb029d3c19a659bfefd09d5d51a2f791bc61eba7ea826f13d6ee204a8a448c2f5a855c17df07b37517373ff916dd05801063c0568ae9937684
+  languageName: node
+  linkType: hard
+
 "@poppinss/colors@npm:^4.1.5":
   version: 4.1.5
   resolution: "@poppinss/colors@npm:4.1.5"
@@ -2961,6 +3150,16 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@types/chai@npm:^5.2.2":
+  version: 5.2.3
+  resolution: "@types/chai@npm:5.2.3"
+  dependencies:
+    "@types/deep-eql": "npm:*"
+    assertion-error: "npm:^2.0.1"
+  checksum: 10c0/e0ef1de3b6f8045a5e473e867c8565788c444271409d155588504840ad1a53611011f85072188c2833941189400228c1745d78323dac13fcede9c2b28bacfb2f
+  languageName: node
+  linkType: hard
+
 "@types/concat-stream@npm:^2.0.0":
   version: 2.0.3
   resolution: "@types/concat-stream@npm:2.0.3"
@@ -2979,6 +3178,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@types/deep-eql@npm:*":
+  version: 4.0.2
+  resolution: "@types/deep-eql@npm:4.0.2"
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+  resolution: "esbuild@npm:0.27.3"
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+    "@esbuild/freebsd-arm64": "npm:0.27.3"
+    "@esbuild/freebsd-x64": "npm:0.27.3"
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+    "@esbuild/linux-x64": "npm:0.27.3"
+    "@esbuild/netbsd-arm64": "npm:0.27.3"
+    "@esbuild/netbsd-x64": "npm:0.27.3"
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+    "@esbuild/openbsd-x64": "npm:0.27.3"
+    "@esbuild/openharmony-arm64": "npm:0.27.3"
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+    "@esbuild/win32-arm64": "npm:0.27.3"
+    "@esbuild/win32-ia32": "npm:0.27.3"
+    "@esbuild/win32-x64": "npm:0.27.3"
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+    "@esbuild/linux-x64":
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+    "@esbuild/netbsd-arm64":
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+    "@esbuild/netbsd-x64":
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+    "@esbuild/openbsd-arm64":
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+    "@esbuild/openbsd-x64":
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+      optional: true
+    "@esbuild/sunos-x64":
+      optional: true
+    "@esbuild/win32-arm64":
+      optional: true
+    "@esbuild/win32-ia32":
+      optional: true
+    "@esbuild/win32-x64":
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   resolution: "escalade@npm:3.2.0"
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+  resolution: "expect-type@npm:1.3.0"
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+
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+  resolution: "fsevents@npm:2.3.2"
+  dependencies:
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+  resolution: "fsevents@patch:fsevents@npm%3A2.3.2#optional!builtin<compat/fsevents>::version=2.3.2&hash=df0bf1"
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+  conditions: os=darwin
+  languageName: node
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+
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+  languageName: node
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+
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   resolution: "on-exit-leak-free@npm:2.1.2"
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+  resolution: "pixelmatch@npm:7.1.0"
+  dependencies:
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+  resolution: "playwright-core@npm:1.58.2"
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+  languageName: node
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+  resolution: "playwright@npm:1.58.2"
+  dependencies:
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+    playwright-core: "npm:1.58.2"
+  dependenciesMeta:
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+  bin:
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+  languageName: node
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+  languageName: node
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+
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   resolution: "portfinder@npm:1.0.37"
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     "@types/react": "npm:^19.2.2"
     "@vitejs/plugin-react": "npm:^4.7.0"
+    "@vitest/browser-playwright": "npm:^4.0.18"
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     chokidar: "npm:^4.0.3"
     docson: "npm:^2.1.0"
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     mdast-util-to-string: "npm:^4.0.0"
     mdast-util-toc: "npm:^7.1.0"
+    playwright: "npm:^1.58.2"
     prettier: "npm:^3.6.2"
     react: "npm:^19.1.0"
     react-dom: "npm:^19.1.0"
@@ -9036,6 +9544,8 @@ __metadata:
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     vite-plugin-env-compatible: "npm:^2.0.1"
     vite-plugin-page-reload: "npm:^0.2.2"
+    vitest: "npm:^4.0.18"
+    vitest-browser-react: "npm:^2.0.5"
     wrangler: "npm:^4.63.0"
   languageName: unknown
   linkType: soft
@@ -9596,6 +10106,13 @@ __metadata:
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+  resolution: "siginfo@npm:2.0.0"
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+  languageName: node
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+
 "signal-exit@npm:^4.0.1, signal-exit@npm:^4.1.0":
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+  resolution: "sirv@npm:3.0.2"
+  dependencies:
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+    mrmime: "npm:^2.0.0"
+    totalist: "npm:^3.0.0"
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+  languageName: node
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+
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   resolution: "slash@npm:5.1.0"
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+  languageName: node
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   resolution: "statuses@npm:2.0.1"
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+  resolution: "std-env@npm:3.10.0"
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+  version: 1.0.2
+  resolution: "tinyexec@npm:1.0.2"
+  checksum: 10c0/1261a8e34c9b539a9aae3b7f0bb5372045ff28ee1eba035a2a059e532198fe1a182ec61ac60fa0b4a4129f0c4c4b1d2d57355b5cb9aa2d17ac9454ecace502ee
+  languageName: node
+  linkType: hard
+
 "tinyglobby@npm:^0.2.12, tinyglobby@npm:^0.2.14, tinyglobby@npm:^0.2.15":
   version: 0.2.15
   resolution: "tinyglobby@npm:0.2.15"
@@ -10054,6 +10610,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"tinyrainbow@npm:^3.0.3":
+  version: 3.0.3
+  resolution: "tinyrainbow@npm:3.0.3"
+  checksum: 10c0/1e799d35cd23cabe02e22550985a3051dc88814a979be02dc632a159c393a998628eacfc558e4c746b3006606d54b00bcdea0c39301133956d10a27aa27e988c
+  languageName: node
+  linkType: hard
+
 "tldts-core@npm:^6.1.86":
   version: 6.1.86
   resolution: "tldts-core@npm:6.1.86"
@@ -10104,6 +10667,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"totalist@npm:^3.0.0":
+  version: 3.0.1
+  resolution: "totalist@npm:3.0.1"
+  checksum: 10c0/4bb1fadb69c3edbef91c73ebef9d25b33bbf69afe1e37ce544d5f7d13854cda15e47132f3e0dc4cafe300ddb8578c77c50a65004d8b6e97e77934a69aa924863
+  languageName: node
+  linkType: hard
+
 "tough-cookie@npm:^5.1.1":
   version: 5.1.2
   resolution: "tough-cookie@npm:5.1.2"
@@ -10731,6 +11301,138 @@ __metadata:
   languageName: node
   linkType: hard
 
+"vite@npm:^6.0.0 || ^7.0.0":
+  version: 7.3.1
+  resolution: "vite@npm:7.3.1"
+  dependencies:
+    esbuild: "npm:^0.27.0"
+    fdir: "npm:^6.5.0"
+    fsevents: "npm:~2.3.3"
+    picomatch: "npm:^4.0.3"
+    postcss: "npm:^8.5.6"
+    rollup: "npm:^4.43.0"
+    tinyglobby: "npm:^0.2.15"
+  peerDependencies:
+    "@types/node": ^20.19.0 || >=22.12.0
+    jiti: ">=1.21.0"
+    less: ^4.0.0
+    lightningcss: ^1.21.0
+    sass: ^1.70.0
+    sass-embedded: ^1.70.0
+    stylus: ">=0.54.8"
+    sugarss: ^5.0.0
+    terser: ^5.16.0
+    tsx: ^4.8.1
+    yaml: ^2.4.2
+  dependenciesMeta:
+    fsevents:
+      optional: true
+  peerDependenciesMeta:
+    "@types/node":
+      optional: true
+    jiti:
+      optional: true
+    less:
+      optional: true
+    lightningcss:
+      optional: true
+    sass:
+      optional: true
+    sass-embedded:
+      optional: true
+    stylus:
+      optional: true
+    sugarss:
+      optional: true
+    terser:
+      optional: true
+    tsx:
+      optional: true
+    yaml:
+      optional: true
+  bin:
+    vite: bin/vite.js
+  checksum: 10c0/5c7548f5f43a23533e53324304db4ad85f1896b1bfd3ee32ae9b866bac2933782c77b350eb2b52a02c625c8ad1ddd4c000df077419410650c982cd97fde8d014
+  languageName: node
+  linkType: hard
+
+"vitest-browser-react@npm:^2.0.5":
+  version: 2.0.5
+  resolution: "vitest-browser-react@npm:2.0.5"
+  peerDependencies:
+    "@types/react": ^18.0.0 || ^19.0.0
+    "@types/react-dom": ^18.0.0 || ^19.0.0
+    react: ^18.0.0 || ^19.0.0
+    react-dom: ^18.0.0 || ^19.0.0
+    vitest: ^4.0.0
+  peerDependenciesMeta:
+    "@types/react":
+      optional: true
+    "@types/react-dom":
+      optional: true
+  checksum: 10c0/ae972fa20895c73622c2e724a2e2a716cc2a2e5148da19a60d1185323aeb5f5bd0653cfe3048d081bb086ee0efa68c0c360d28cdf42ddd8df6a5f2d17ffd0c9e
+  languageName: node
+  linkType: hard
+
+"vitest@npm:^4.0.18":
+  version: 4.0.18
+  resolution: "vitest@npm:4.0.18"
+  dependencies:
+    "@vitest/expect": "npm:4.0.18"
+    "@vitest/mocker": "npm:4.0.18"
+    "@vitest/pretty-format": "npm:4.0.18"
+    "@vitest/runner": "npm:4.0.18"
+    "@vitest/snapshot": "npm:4.0.18"
+    "@vitest/spy": "npm:4.0.18"
+    "@vitest/utils": "npm:4.0.18"
+    es-module-lexer: "npm:^1.7.0"
+    expect-type: "npm:^1.2.2"
+    magic-string: "npm:^0.30.21"
+    obug: "npm:^2.1.1"
+    pathe: "npm:^2.0.3"
+    picomatch: "npm:^4.0.3"
+    std-env: "npm:^3.10.0"
+    tinybench: "npm:^2.9.0"
+    tinyexec: "npm:^1.0.2"
+    tinyglobby: "npm:^0.2.15"
+    tinyrainbow: "npm:^3.0.3"
+    vite: "npm:^6.0.0 || ^7.0.0"
+    why-is-node-running: "npm:^2.3.0"
+  peerDependencies:
+    "@edge-runtime/vm": "*"
+    "@opentelemetry/api": ^1.9.0
+    "@types/node": ^20.0.0 || ^22.0.0 || >=24.0.0
+    "@vitest/browser-playwright": 4.0.18
+    "@vitest/browser-preview": 4.0.18
+    "@vitest/browser-webdriverio": 4.0.18
+    "@vitest/ui": 4.0.18
+    happy-dom: "*"
+    jsdom: "*"
+  peerDependenciesMeta:
+    "@edge-runtime/vm":
+      optional: true
+    "@opentelemetry/api":
+      optional: true
+    "@types/node":
+      optional: true
+    "@vitest/browser-playwright":
+      optional: true
+    "@vitest/browser-preview":
+      optional: true
+    "@vitest/browser-webdriverio":
+      optional: true
+    "@vitest/ui":
+      optional: true
+    happy-dom:
+      optional: true
+    jsdom:
+      optional: true
+  bin:
+    vitest: vitest.mjs
+  checksum: 10c0/b913cd32032c95f29ff08c931f4b4c6fd6d2da498908d6770952c561a1b8d75c62499a1f04cadf82fb89cc0f9a33f29fb5dfdb899f6dbb27686a9d91571be5fa
+  languageName: node
+  linkType: hard
+
 "w3c-keyname@npm:^2.2.4":
   version: 2.2.8
   resolution: "w3c-keyname@npm:2.2.8"
@@ -10892,6 +11594,18 @@ __metadata:
   languageName: node
   linkType: hard
 
+"why-is-node-running@npm:^2.3.0":
+  version: 2.3.0
+  resolution: "why-is-node-running@npm:2.3.0"
+  dependencies:
+    siginfo: "npm:^2.0.0"
+    stackback: "npm:0.0.2"
+  bin:
+    why-is-node-running: cli.js
+  checksum: 10c0/1cde0b01b827d2cf4cb11db962f3958b9175d5d9e7ac7361d1a7b0e2dc6069a263e69118bd974c4f6d0a890ef4eedfe34cf3d5167ec14203dbc9a18620537054
+  languageName: node
+  linkType: hard
+
 "widest-line@npm:^5.0.0":
   version: 5.0.0
   resolution: "widest-line@npm:5.0.0"
@@ -11032,6 +11746,21 @@ __metadata:
   languageName: node
   linkType: hard
 
+"ws@npm:^8.18.3":
+  version: 8.19.0
+  resolution: "ws@npm:8.19.0"
+  peerDependencies:
+    bufferutil: ^4.0.1
+    utf-8-validate: ">=5.0.2"
+  peerDependenciesMeta:
+    bufferutil:
+      optional: true
+    utf-8-validate:
+      optional: true
+  checksum: 10c0/4741d9b9bc3f9c791880882414f96e36b8b254e34d4b503279d6400d9a4b87a033834856dbdd94ee4b637944df17ea8afc4bce0ff4a1560d2166be8855da5b04
+  languageName: node
+  linkType: hard
+
 "wsl-utils@npm:^0.1.0":
   version: 0.1.0
   resolution: "wsl-utils@npm:0.1.0"