Support cloudflare wrangler

[bkniffler]

What is the problem this feature would solve?

Error when trying to use wrangler, e.g. to run a test for a cloudflare worker.

Message

[bun] Warning: worker_threads.Worker option "execArgv" is not implemented.

Code example

import {expect, test} from 'bun:test'
import {unstable_dev} from 'wrangler'
import {join} from 'path'

const root = join(__dirname, '../../..')
test('durable-objects', async () => {
  const handler  = await unstable_dev(join(root, 'src/index.ts'), {
    config: join(root, 'wrangler.toml'),
    experimental: {
      disableExperimentalWarning: true,
      disableDevRegistry: true
    },
    bundle: false,
    compatibilityDate: '2023-10-10',
    local: true,
    logLevel: 'debug',
  });
  const res =await handler.fetch('http://worker.dev', {});
  const json = await res.json();
  expect(json).toEqual({hello: 'world'});
});

What is the feature you are proposing to solve the problem?

Add support for execArgv and thus for wrangler.

What alternatives have you considered?

Use vitest/jest.

[bkniffler]

Here is the execArgv support issue: #4130

[Electroid]

Duplicate of #4130

[bkniffler]

Still not working yet unfortunately, waiting for #8867 to work for unstable_dev, for anyone stumbling upon this

[bkniffler]

As well as #4165

[jbergstroem]

Just ran across this and it still doesn't fully work for me. Put up a reproduction here: https://github.com/jbergstroem/bun-wrangler-test - basically the code you shared above plus an entrypoint:

index.ts

export default {
	async fetch(request: Request): Promise<Response> {
		return new Response("Hello World!");
	},
} satisfies ExportedHandler<Env>;

index.test.ts

import { expect, test } from "bun:test";
import { join } from "node:path";
import { unstable_dev } from "wrangler";

const root = join("./");
test("durable-objects", async () => {
	const handler = await unstable_dev("./index.js", {
		config: "./wrangler.toml",
		experimental: {
			disableExperimentalWarning: true,
			disableDevRegistry: true,
		},
		bundle: false,
		local: true,
		logLevel: "debug",
	});
	const res = await handler.fetch("http://worker.dev", {});
	const json = await res.json();
	expect(json).toEqual({ hello: "world" });
});

..since it trips on typescript syntax when bundling is off, I also did a javascript endpoint that ultimately also fails (bundle: true/false does not matter).

output:

Error in ProxyController: Failed to start ProxyWorker or InspectorProxyWorker
 Error: Unexpected server response: 101
    at <anonymous> (/Users/jbergstroem/wrk/oss/bun-wrangler-test/node_modules/wrangler/wrangler-dist/cli.js:34415:11)
    at emit (node:events:73:22)
    at <anonymous> (node:http:1006:60)
    at processTicksAndRejections (native:7:39) {
  originalLine: 28738,
  originalColumn: 27
}