Support for miniflare on windows

[ryuapp]

Miniflare is a simulator for developing and testing Cloudflare Workers, powered by workerd.
This library is used by many frameworks as Cloudflare adapter.
e.g.) SvelteKit, Astro, HonoX

Currently, the example written in README does not work either.

PS miniflare> deno --version
deno 2.0.0-rc.2+0a4a8c7 (canary, release, x86_64-pc-windows-msvc)
v8 12.9.202.13-rusty
typescript 5.5.2

miniflare> me mini.ts

import { Miniflare } from "npm:miniflare";

// Create a new Miniflare instance, starting a workerd server
const mf = new Miniflare({
        script: `addEventListener("fetch", (event) => {
    event.respondWith(new Response("Hello Miniflare!"));
  })`,
});

// Send a request to the workerd server, the host is ignored
const response = await mf.dispatchFetch("http://localhost:8787/");
console.log(await response.text()); // Hello Miniflare!

// Cleanup Miniflare, shutting down the workerd server
await mf.dispose();

PS miniflare> deno -A mini.ts
error: Uncaught (in promise) TypeError: undefined is not iterable (cannot read property Symbol(Symbol.iterator))
    at Function.from (<anonymous>)
    at Object.<anonymous> (file:///C:/Users/xxxx/AppData/Local/deno/npm/registry.npmjs.org/miniflare/3.20240821.1/dist/src/index.js:6744:64)
    at Object.<anonymous> (file:///C:/Users/xxxx/AppData/Local/deno/npm/registry.npmjs.org/miniflare/3.20240821.1/dist/src/index.js:10197:4)
    at Module._compile (node:module:735:34)
    at Object.Module._extensions..js (node:module:756:11)
    at Module.load (node:module:655:32)
    at Function.Module._load (node:module:523:13)
    at Module.require (node:module:674:19)
    at require (node:module:800:16)
    at file:///C:/Users/xxxx/AppData/Local/deno/npm/registry.npmjs.org/miniflare/3.20240821.1/dist/src/index.js:3:13

Related: #25513

[lucacasonato]

It works for me using both node_modules and npm: specifiers and a global module directory:

$ npm install miniflare
$ cat main.ts
import { Miniflare } from "miniflare";

// Create a new Miniflare instance, starting a workerd server
const mf = new Miniflare({
	script: `addEventListener("fetch", (event) => {
    event.respondWith(new Response("Hello Miniflare!"));
  })`,
});

// Send a request to the workerd server, the host is ignored
const response = await mf.dispatchFetch("http://localhost:8787/");
console.log(await response.text()); // Hello Miniflare!

// Cleanup Miniflare, shutting down the workerd server
await mf.dispose();

$ deno -V
deno 1.46.3
$ deno run -A main.ts
Hello Miniflare!

$ cat main.ts
import { Miniflare } from "npm:miniflare";

// Create a new Miniflare instance, starting a workerd server
const mf = new Miniflare({
	script: `addEventListener("fetch", (event) => {
    event.respondWith(new Response("Hello Miniflare!"));
  })`,
});

// Send a request to the workerd server, the host is ignored
const response = await mf.dispatchFetch("http://localhost:8787/");
console.log(await response.text()); // Hello Miniflare!

// Cleanup Miniflare, shutting down the workerd server
await mf.dispose();

$ deno -V
deno 1.46.3
$ deno run -A main.ts
Hello Miniflare!

Maybe this only happens on Windows?

[ryuapp]

Maybe this only happens on Windows?

I guess so. There were no errors when I ran it on WSL.

[nathanwhit]

Confirmed it reproduces on windows. The immediate issue is #25604, but supporting this will also require fixing #23524