diff --git a/.github/scripts/clean-tracked-rescript-output.sh b/.github/scripts/clean-tracked-rescript-output.sh
new file mode 100644
index 000000000..fe3ba5edf
--- /dev/null
+++ b/.github/scripts/clean-tracked-rescript-output.sh
@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# rescript clean only knows sources that still belong to the build. Identify
+# tracked compiler output from the index so deleted/excluded sources are covered,
+# while handwritten JavaScript and configuration remain untouched.
+git ls-files -z -- '*.jsx' '*.mjs' |
+  while IFS= read -r -d '' output; do
+    committed=$(git show ":$output")
+    if [[ "$committed" == "// Generated by ReScript,"* ]]; then
+      rm -f -- "$output"
+    fi
+  done
diff --git a/.github/workflows/pull-request.yml b/.github/workflows/pull-request.yml
index cdea97b7e..3bc1319f6 100644
--- a/.github/workflows/pull-request.yml
+++ b/.github/workflows/pull-request.yml
@@ -17,7 +17,7 @@ jobs:
           cache: yarn
       - name: Install dependencies
         run: yarn
-      - name: Format check
+      - name: Check formatting (Oxfmt and ReScript)
         run: yarn ci:format
   Site_Checks:
     runs-on: ubuntu-latest
@@ -39,6 +39,8 @@ jobs:
         run: |
           yarn check:routes
           git diff --exit-code -- packages/shared/src/Path.res
+      - name: Check committed ReScript output
+        run: yarn ci:generated
       - name: Test examples and hrefs
         run: yarn test
   # Check the built Docs Pages routes and the Guide local dev server.
diff --git a/README.md b/README.md
index bbd6c6718..361960195 100644
--- a/README.md
+++ b/README.md
@@ -111,6 +111,21 @@ ReScript builds and when starting the ReScript watcher. After changing routes,
 adding or removing MDX pages, or updating API data during a watch session, run
 `yarn build:routes` again. CI rejects a stale generated file.
 
+### Formatting and Generated Output
+
+`yarn ci:format` checks Oxfmt formatting and ReScript formatting across all four
+workspaces. Run `yarn format` to apply both formatters.
+
+`yarn ci:generated` cleans ReScript artifacts, removes tracked compiler output,
+and rebuilds, then fails if any tracked `.jsx` or `.mjs` file differs from the
+committed version. Most compiler output is ignored by Git; the guide's
+`app/root.jsx` and `app/routes.jsx` are currently tracked. After changing their
+ReScript sources or updating the compiler, run `yarn build:res` and commit the
+regenerated output alongside the sources.
+
+Both checks run on pull requests. Removing tracked output before rebuilding also
+catches orphaned output whose source was deleted or excluded from the build.
+
 ### Vitest Browser Tests
 
 We use [Vitest](https://vitest.dev/) in browser mode with Playwright for component-level tests. Test files live in `__tests__/` and are written in ReScript.
diff --git a/apps/docs/package.json b/apps/docs/package.json
index 22b6ccdf6..761b69db1 100644
--- a/apps/docs/package.json
+++ b/apps/docs/package.json
@@ -26,7 +26,7 @@
     "dev:vite": "react-router dev --host",
     "dev:wrangler": "yarn build:vite && yarn wrangler pages dev build/client",
     "dev": "yarn prepare && yarn dev:res & yarn dev:vite & yarn dev:wrangler",
-    "format": "cd ../.. && oxfmt && cd apps/docs && rescript format",
+    "format": "cd ../.. && yarn format",
     "prepare": "yarn build:res && yarn build:scripts && yarn check:algolia-public-env && yarn build:update-index",
     "preview": "yarn build && static-server build/client",
     "serve:build": "static-server --host 127.0.0.1 --port 4173 build/client",
diff --git a/apps/guide/app/routes.jsx b/apps/guide/app/routes.jsx
index c22c7185b..e793a07bf 100644
--- a/apps/guide/app/routes.jsx
+++ b/apps/guide/app/routes.jsx
@@ -4,5 +4,7 @@ import * as Routes from "@react-router/dev/routes";
 
 let $$default = [Routes.index("./GuideHomeRoute.jsx")];
 
-export { $$default as default };
+export {
+  $$default as default,
+}
 /* default Not a pure module */
diff --git a/package.json b/package.json
index bd5bcbe2a..30c76f813 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,8 @@
     "build:update-index": "yarn workspace @rescript-lang/docs build:update-index",
     "build:vite": "yarn workspace @rescript-lang/docs build:vite",
     "build": "yarn workspace @rescript-lang/docs build",
-    "ci:format": "oxfmt --check",
+    "ci:format": "oxfmt --check && rescript format --check",
+    "ci:generated": "yarn clean:res && bash .github/scripts/clean-tracked-rescript-output.sh && yarn build:res && git diff --exit-code -- '*.jsx' '*.mjs'",
     "ci:test": "yarn workspace @rescript-lang/docs ci:test && yarn workspace @rescript-lang/guide ci:test",
     "ci:test:visual": "yarn workspace @rescript-lang/docs ci:test:visual",
     "clean:res": "rescript clean",
@@ -27,7 +28,7 @@
     "dev:res": "yarn build:routes && rescript watch",
     "dev:guide": "yarn workspace @rescript-lang/guide dev:vite",
     "dev": "yarn workspace @rescript-lang/docs dev",
-    "format": "yarn workspace @rescript-lang/docs format",
+    "format": "oxfmt && rescript format",
     "preview": "yarn workspace @rescript-lang/docs preview",
     "reanalyze": "yarn workspace @rescript-lang/docs reanalyze",
     "test": "yarn workspace @rescript-lang/docs test",