🐛 BUG: unstable_dev inspect and inspector_port appear not to work

[JustinGrote]

What version of Wrangler are you using?

2.6.2

What operating system are you using?

Windows

Describe the Bug

describe('UnstableDevWorker', () => {
	let worker: UnstableDevWorker
	let base: string

	beforeAll(async () => {
		worker = await unstable_dev(
			'src/worker.ts',
			{ inspect: true, inspectorPort: 39929 },
			{ disableExperimentalWarning: true }
		)
		base = 'http://' + worker.address + ':' + worker.port
	})

netstat never shows 39929 opening even when pausing the debugger or leaving a long wait in the test. This is preventing me from debugging inside of unstable_dev and makes it much less useful. I use hono router in front of it and tend to use that instead so I can debug inside the "worker" itself, I would like to be able to use unstable_dev in vscode for this however

Success Criteria

Be able to set a breakpoint within Visual Studio code using a test in vitest with unstable_dev and have it pause on the breakpoint inside the worker when calling fetch

[JacobMGEvans]

If you could provide a minimal repro, maybe with Hono, that would help immensely to get to it sooner.

[penalosa]

We're going to close this for now, but feel free to comment here with a minimal reproduction and we can investigate further. It's also possible this has been fixed in recent versions of Wrangler, as unstable_dev is undergoing fairly active development.

[ThomasHambach]

Hi @penalosa , Commented on wrong issue before.I am actually running into the same issue. The reproduction is quite simple. This is on wrangler 3.4

await unstable_dev('index.ts'), {
        port: 42000,
        local: true,
        inspectorPort: 42001,
        inspect: true,
        compatibilityDate: "2023-03-14",
        logLevel: "debug",
        experimental: {
            disableExperimentalWarning: true,
            watch: false
        }
    });
await server.start();

Trying to connect using devtools will not work. Running netstat -an | findstr :42001 shows no active connections.

I am trying to see where unstable_dev and the regular startServer diverge. But perhaps you know where to look.

[frankichiro]

I am also having this issue, on Linux.

[JustinGrote]

As an update, using Wrangler v3 (which uses workerd formerly known as unstable_dev) and this configuration, should work fine:
#4174

[JustinGrote]

@penalosa still having this issue even with latest wrangler commit dc16f4e, here is a repro:
inspectorPort does not actually open the port when requested.

Test (vitest)

import { describe, expect, it } from 'vitest'
import { unstable_dev } from 'wrangler'

describe('Unstable Dev No Inspector Test', () => {
	it('should open inspect on custom port', async () => {
		const worker = await unstable_dev('src/worker.ts', {
			inspect: true,
			inspectorPort: 10000,
			ip: '127.0.0.1', //Just to make sure IPv6 isn't used
		})

		console.log(worker.address)
		console.log(worker.port)
		const x = await worker.fetch('index.json')
		expect(true).toBeTruthy()
	})
})

Notes

• wrangler dev works fine