Error: No such module "node:os".

[hotrush]

I'm trying to test my worker with miniflare and so adding next code to my index.spec.ts

import { Miniflare } from 'miniflare';

const mf = new Miniflare({
	modules: true,
	scriptPath: './src/index.ts',
	r2Buckets: ['R2_BUCKET'],
});

When running it i'm getting an error:

Using vars defined in .dev.vars
[vpw:inf] Starting isolated runtimes for vitest.config.mts...
[mf:wrn] The latest compatibility date supported by the installed Cloudflare Workers Runtime is "2024-12-05",
but you've requested "2024-12-16". Falling back to "2024-12-05"...
workerd/server/server.c++:3052: error: Fallback service failed to fetch module; payload = ; spec = /?specifier=node%3Aos&referrer=%2FUsers%2Frush%2FProjects%2Fproj%2Fnode_modules%2Fminiflare%2Fdist%2Fsrc%2Findex.js%3Fmf_vitest_no_cjs_esm_shim&rawSpecifier=node%3Aos
 ❯ test/index.spec.ts (0)

⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯ Failed Suites 1 ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯

 FAIL  test/index.spec.ts [ test/index.spec.ts ]
Error: No such module "node:os".
 ❯ Users/rush/Projects/proj/node_modules/miniflare/dist/src/index.js?mf_vitest_no_cjs_esm_shim:2623:26

Node: v20.17.0
Miniflare: 3.20241205.0

[andyjessop]

@hotrush thanks very much for reporting this! Would you be able to provide us with a minimal reproduction? I can't reproduce this locally, and I'm wondering how this node:os dependency is creeping into the code.

[hotrush]

@andyjessop here it is https://github.com/hotrush/cf-miniflare-eror, just run npm run test.