🐛 BUG: Error: No such module "node:constants"

[timkelty]

Which Cloudflare product(s) does this pertain to?

Workers Vitest Integration

What versions are you using?

@cloudflare/vitest-pool-workers 0.6.16

What operating system and version are you using?

Mac 15.3.1 (24D70)

Please provide a link to a minimal reproduction

https://github.com/timkelty/cloudflare-workers-node-constants

Describe the Bug

When running tests, importing a dependency that imports from constants (example) will result in:

FAIL test/index.spec.ts [ test/index.spec.ts ]
Error: No such module "node:constants".
❯ Users/timkelty/Desktop/node-constants/node_modules/http-message-signatures/lib/algorithm/index.js?mf_vitest_no_cjs_esm_shim:5:21
❯ Users/timkelty/Desktop/node-constants/node_modules/http-message-signatures/lib/index.js?mf_vitest_no_cjs_esm_shim:30:14

• I've tried Depency pre-building without any luck
• This only happens during vitest, wrangler deploy works fine.

Please provide any relevant error logs

No response

[emily-shen]

Hey! You need to build with wrangler deploy --dry-run --outdir=dist and set your vitest config to use the built output - this will make sure wrangler bundles the node polyfills in.

I think we're working on a smoother workflow though - cc @edmundhung ?

[timkelty]

Thanks @emily-shen! Getting closer:

Here's what I tried:

// vitest.config.ts
import { defineWorkersProject } from "@cloudflare/vitest-pool-workers/config";
export default defineWorkersProject({
	test: {
		poolOptions: {
			workers: {
				main: "./dist/index.js",
				wrangler: {
					configPath: "./wrangler.jsonc",
					environment: "production",
				},
				miniflare: {
					kvNamespaces: ["CRAFT_CLOUD_HOSTS"],
				},
			},
		},
	},
});

With this in package.json:scripts

		"build": "wrangler deploy --dry-run --outdir ./dist",
		"pretest": "npm run build",
		"test": "vitest",

With that, I still get the error.
However, if I convert it to an async import (await import('http-message-signatures')), it works fine. Note: I tried this approach before setting main: "./dist/index.js", and it didn't help.