fix(vite): support JSX in .jsx files without React import

.changeset/clever-months-swim.md

@@ -0,0 +1,5 @@
+---
+"@remix-run/dev": patch
+---
+
+Support JSX usage in `.jsx` files without manual `React` import in Vite

contributors.yml

@@ -195,6 +195,7 @@
 - harmony7
 - helderburato
 - HenryVogt
+- hi-ogawa
 - hicksy
 - himorishige
 - Hirochon

integration/vite-dev-test.ts

@@ -93,7 +93,7 @@ test.describe("Vite dev", () => {
 
           export const loader: LoaderFunction = () => {
             const headers = new Headers();
-          
+
             headers.append(
               "Set-Cookie",
               "first=one; Domain=localhost; Path=/; SameSite=Lax"
@@ -110,12 +110,12 @@ test.describe("Vite dev", () => {
             );
 
             headers.set("location", "http://localhost:${devPort}/get-cookies");
-          
+
             const response = new Response(null, {
               headers,
               status: 302,
             });
-          
+
             return response;
           };
         `,
@@ -136,6 +136,15 @@ test.describe("Vite dev", () => {
             );
           }
         `,
+        "app/routes/jsx.jsx": js`
+          export default function JsxRoute() {
+            return (
+              <div id="jsx">
+                <p data-hmr>HMR updated: no</p>
+              </div>
+            );
+          }
+        `,
       },
     });
 
@@ -228,6 +237,33 @@ test.describe("Vite dev", () => {
       "first=one; second=two; third=three"
     );
   });
+
+  test("handles JSX in .jsx file without React import", async ({ page }) => {
+    let pageErrors: unknown[] = [];
+    page.on("pageerror", (error) => pageErrors.push(error));
+
+    await page.goto(`http://localhost:${devPort}/jsx`, {
+      waitUntil: "networkidle",
+    });
+    expect(pageErrors).toEqual([]);
+
+    let hmrStatus = page.locator("#jsx [data-hmr]");
+    await expect(hmrStatus).toHaveText("HMR updated: no");
+
+    let indexRouteContents = await fs.readFile(
+      path.join(projectDir, "app/routes/jsx.jsx"),
+      "utf8"
+    );
+    await fs.writeFile(
+      path.join(projectDir, "app/routes/jsx.jsx"),
+      indexRouteContents.replace("HMR updated: no", "HMR updated: yes"),
+      "utf8"
+    );
+    await page.waitForLoadState("networkidle");
+    await expect(hmrStatus).toHaveText("HMR updated: yes");
+
+    expect(pageErrors).toEqual([]);
+  });
 });
 
 let bufferize = (stream: Readable): (() => string) => {

packages/remix-dev/vite/plugin.ts

@@ -432,6 +432,10 @@ export const remixVitePlugin: RemixVitePlugin = (options = {}) => {
               "react-dom/client",
             ],
           },
+          esbuild: {
+            jsx: "automatic",
+            jsxDev: viteCommand !== "build",
+          },
           resolve: {
             // https://react.dev/warnings/invalid-hook-call-warning#duplicate-react
             dedupe: ["react", "react-dom"],