remix-run · brophdawg11 · Dec 23, 2025 · Dec 19, 2025 · Dec 19, 2025 · Dec 22, 2025
diff --git a/.changeset/little-timers-occur.md b/.changeset/little-timers-occur.md
@@ -0,0 +1,5 @@
+---
+"react-router": patch
+---
+
+[UNSTABLE] Pass `<Scripts nonce>` value through to the underlying `importmap` `script` tag when using `future.unstable_subResourceIntegrity`
diff --git a/contributors.yml b/contributors.yml
@@ -106,6 +106,7 @@
 - developit
 - dgrijuela
 - DigitalNaut
+- dimmageiras
 - DimaAmega
 - dmitrytarassov
 - dogxii

diff --git a/integration/helpers/vite.ts b/integration/helpers/vite.ts
@@ -31,6 +31,7 @@ export const reactRouterConfig = ({
   v8_middleware,
   v8_splitRouteModules,
   v8_viteEnvironmentApi,
+  unstable_subResourceIntegrity,
   routeDiscovery,
 }: {
   ssr?: boolean;
@@ -40,6 +41,7 @@ export const reactRouterConfig = ({
   v8_middleware?: boolean;
   v8_splitRouteModules?: NonNullable<Config["future"]>["v8_splitRouteModules"];
   v8_viteEnvironmentApi?: boolean;
+  unstable_subResourceIntegrity?: boolean;
   routeDiscovery?: Config["routeDiscovery"];
 }) => {
   let config: Config = {
@@ -52,6 +54,7 @@ export const reactRouterConfig = ({
       v8_middleware,
       v8_splitRouteModules,
       v8_viteEnvironmentApi,
+      unstable_subResourceIntegrity,
     },
   };
 

diff --git a/integration/sri-test.ts b/integration/sri-test.ts
@@ -0,0 +1,74 @@
+import { test, expect } from "@playwright/test";
+
+import {
+  createAppFixture,
+  createFixture,
+  js,
+} from "./helpers/create-fixture.js";
+import type { AppFixture, Fixture } from "./helpers/create-fixture.js";
+import { reactRouterConfig } from "./helpers/vite.js";
+import { PlaywrightFixture } from "./helpers/playwright-fixture.js";
+
+test.describe("CSub-Resource Integrity", () => {
+  test.use({ javaScriptEnabled: false });
+
+  let fixture: Fixture;
+  let appFixture: AppFixture;
+
+  test.beforeAll(async () => {
+    fixture = await createFixture({
+      files: {
+        "react-router.config.ts": reactRouterConfig({
+          unstable_subResourceIntegrity: true,
+        }),
+        "app/root.tsx": js`
+          import { Links, Meta, Outlet, Scripts } from "react-router";
+
+          export default function Root() {
+            return (
+              <html>
+                <head>
+                  <Meta />
+                  <Links />
+                </head>
+                <body>
+                  <Outlet />
+                  <Scripts nonce="test-nonce-123" />
+                </body>
+              </html>
+            );
+          }
+        `,
+      },
+    });
+    appFixture = await createAppFixture(fixture);
+  });
+
+  test("includes an importmap", async ({ page }) => {
+    let app = new PlaywrightFixture(appFixture, page);
+    await app.goto("/");
+    let json = await page.locator('script[type="importmap"]').innerText();
+    let importMap = JSON.parse(json);
+    expect(Object.keys(importMap.integrity).length).toBeGreaterThan(0);
+    for (let key in importMap.integrity) {
+      if (key.includes("manifest")) continue;
+      let value = importMap.integrity[key];
+      expect(value).toMatch(/^sha384-/);
+
+      let linkEl = page.locator(`link[rel="modulepreload"][href="${key}"]`);
+      expect(await linkEl.getAttribute("href")).toBe(key);
+      expect(await linkEl.getAttribute("integrity")).toBe(value);
+
+      let scriptEl = page.locator(`script[type="module"]`);
+      expect(await scriptEl.innerText()).toContain(key);
+    }
+  });
+
+  test("includes a nonce on the importmap script", async ({ page }) => {
+    let app = new PlaywrightFixture(appFixture, page);
+    await app.goto("/");
+    expect(
+      await page.locator('script[type="importmap"]').getAttribute("nonce"),
+    ).toBe("test-nonce-123");
+  });
+});
diff --git a/packages/react-router/lib/dom/ssr/components.tsx b/packages/react-router/lib/dom/ssr/components.tsx
@@ -901,6 +901,7 @@ import(${JSON.stringify(manifest.entry.module)});`;
     <>
       {typeof manifest.sri === "object" ? (
         <script
+          {...scriptProps}
           rr-importmap=""
           type="importmap"
           suppressHydrationWarning