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petebacondarwinpetebacondarwin
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add support for run_worker_first 
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‎.changeset/all-doors-pick.md‎

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"@cloudflare/vite-plugin": patch
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---
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Add support for run_worker_first flag in Miniflare options
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Do not ignore `run_worker_first` in `vite preview` mode.

‎packages/vite-plugin-cloudflare/playground/run-worker-first/__tests__/run-worker-first.spec.ts‎

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import { describe, expect, test } from "vitest";
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import { isBuild, page, viteTestUrl } from "../../__test-utils__";
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describe.skipIf(!isBuild)("run_worker_first support", () => {
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test("returns the correct home page", async () => {
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const content = await page.textContent("h1");
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expect(content).toBe("Vite + React");
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});
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test("returns the response from the API", async () => {
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const button = page.getByRole("button", { name: "get-name" });
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const contentBefore = await button.innerText();
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expect(contentBefore).toBe("Name from API is: unknown");
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const responsePromise = page.waitForResponse((response) =>
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response.url().endsWith("/api/")
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);
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await button.click();
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await responsePromise;
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const contentAfter = await button.innerText();
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expect(contentAfter).toBe("Name from API is: Cloudflare");
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});
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test("returns UNAUTH for the admin page", async () => {
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const response = await fetch(viteTestUrl + "/admin");
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expect(response.status).toBe(401);
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});
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test("returns UNAUTH for an admin image", async () => {
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const response = await fetch(viteTestUrl + "/admin/secret.svg");
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expect(response.status).toBe(401);
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});
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test("returns response for authorized admin page", async () => {
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const response = await fetch(viteTestUrl + "/admin?auth=xxx");
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expect(response.status).toBe(200);
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});
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test("returns response for authorized admin image", async () => {
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const response = await fetch(viteTestUrl + "/admin/secret.svg?auth=xxx");
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expect(response.status).toBe(200);
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});
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});

‎packages/vite-plugin-cloudflare/playground/run-worker-first/index.html‎

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<!doctype html>
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<html lang="en">
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<head>
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<meta charset="UTF-8" />
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<link rel="icon" type="image/svg+xml" href="/vite.svg" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<title>Vite + React + TS</title>
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</head>
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<body>
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<div id="root"></div>
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<script type="module" src="/src/main.tsx"></script>
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</body>
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</html>

‎packages/vite-plugin-cloudflare/playground/run-worker-first/middleware/index.ts‎

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interface Env {
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ASSETS: Fetcher;
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}
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export default {
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async fetch(request, env) {
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const url = new URL(request.url);
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// Protect assets in the `/admin` directory from "unauthorized" access!
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if (url.pathname.startsWith("/admin")) {
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const auth = url.searchParams.get("auth");
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if (!auth) {
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return new Response("Unauthorized access", { status: 401 });
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}
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}
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if (url.pathname.startsWith("/api/")) {
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return Response.json({
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name: "Cloudflare",
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});
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}
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return env.ASSETS.fetch(request);
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},
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} satisfies ExportedHandler<Env>;

‎packages/vite-plugin-cloudflare/playground/run-worker-first/package.json‎

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{
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"name": "@playground/run-worker-first",
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"private": true,
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"type": "module",
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"scripts": {
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"build": "vite build --app",
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"check:types": "tsc --build",
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"dev": "vite dev",
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"preview": "vite preview"
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},
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"dependencies": {
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"react": "^19.0.0",
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"react-dom": "^19.0.0"
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},
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"devDependencies": {
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"@cloudflare/vite-plugin": "workspace:*",
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"@cloudflare/workers-tsconfig": "workspace:*",
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"@cloudflare/workers-types": "^4.20250310.0",
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"@types/react": "^19.0.0",
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"@types/react-dom": "^19.0.0",
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"@vitejs/plugin-react": "^4.3.4",
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"typescript": "catalog:default",
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"vite": "catalog:vite-plugin",
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"wrangler": "workspace:*"
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}
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}

‎packages/vite-plugin-cloudflare/playground/run-worker-first/public/admin/secret.svg‎

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‎packages/vite-plugin-cloudflare/playground/run-worker-first/public/vite.svg‎

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‎packages/vite-plugin-cloudflare/playground/run-worker-first/src/App.css‎

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#root {
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max-width: 1280px;
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margin: 0 auto;
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padding: 2rem;
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text-align: center;
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}
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.logo {
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height: 6em;
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padding: 1.5em;
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will-change: filter;
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transition: filter 300ms;
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}
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.logo:hover {
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filter: drop-shadow(0 0 2em #646cffaa);
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}
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.logo.react:hover {
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filter: drop-shadow(0 0 2em #61dafbaa);
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}
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@keyframes logo-spin {
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from {
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transform: rotate(0deg);
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}
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to {
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transform: rotate(360deg);
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}
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}
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@media (prefers-reduced-motion: no-preference) {
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a:nth-of-type(2) .logo {
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animation: logo-spin infinite 20s linear;
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}
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}
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.card {
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padding: 2em;
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}
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.read-the-docs {
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color: #888;
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}

‎packages/vite-plugin-cloudflare/playground/run-worker-first/src/App.tsx‎

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import viteLogo from "/vite.svg";
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import { useState } from "react";
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import reactLogo from "./assets/react.svg";
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import "./App.css";
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function App() {
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const [count, setCount] = useState(0);
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const [name, setName] = useState("unknown");
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return (
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<>
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<div>
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<a href="https://vite.dev" target="_blank">
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<img src={viteLogo} className="logo" alt="Vite logo" />
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</a>
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<a href="https://react.dev" target="_blank">
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<img src={reactLogo} className="logo react" alt="React logo" />
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</a>
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</div>
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<h1>Vite + React</h1>
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<div className="card">
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<button
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onClick={() => setCount((count) => count + 1)}
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aria-label="increment"
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>
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count is {count}
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</button>
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<p>
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Edit <code>src/App.tsx</code> and save to test HMR
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</p>
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</div>
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<div className="card">
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<button
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onClick={() => {
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fetch("/api/")
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.then((res) => res.json() as Promise<{ name: string }>)
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.then((data) => setName(data.name));
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}}
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aria-label="get-name"
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>
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Name from API is: {name}
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</button>
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<p>
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Edit <code>api/index.ts</code> to change the name
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</p>
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</div>
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<p className="read-the-docs">
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Click on the Vite and React logos to learn more
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</p>
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</>
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);
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}
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export default App;

‎packages/vite-plugin-cloudflare/playground/run-worker-first/src/assets/react.svg‎

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