SpyOn a module function imported by a web worker stops working in 2.1.0-beta.7/2.1.0/2.1.1 #6566
Description
Describe the bug
When a web worker imports a function from another module, in 2.0.5, spyOn can mock the function used by the web worker. This stops working starting from 2.1.0-beta.7.
The following mocking used to be working, given that util.js is imported by the worker script:
Reproduction
Full source code at https://github.com/xuhdev/vitest-web-worker-mock-bug-demo
With vitest from 2.0.5 to 2.1.0-beta.6, running test prints "I'm in test". With vitest from 2.1.0-beta.7 to 2.1.1, running test prints "I'm the production worker.".
index.test.ts:
import { vi } from "vitest";
import * as util from "./util.js";
vi.mock("./util.js", async (importOriginal) => {
const mod = await importOriginal();
return {
...mod,
};
});
test("main", async () => {
vi.spyOn(util, "getWorkerMessage").mockReturnValue("I'm in test");
const worker = new Worker(new URL("./worker.js", import.meta.url));
const promise = new Promise((resolve) => {
worker.onmessage = (e) => {
// Prints "I'm the production worker." in 2.1.0-beta.7 and beyond, "I'm in test" in 2.0.5 and 2.1.0-beta.6.
console.error(e.data);
resolve();
};
});
worker.postMessage(["get message"]);
await promise;
});util.js:
export function getWorkerMessage() {
return "I'm the production worker.";
}worker.js:
import { getWorkerMessage } from "./util.js";
self.onmessage = () => {
postMessage(getWorkerMessage());
};System Info
System:
OS: Linux 6.1 Debian GNU/Linux 12 (bookworm) 12 (bookworm)
CPU: (12) x64 Intel(R) Xeon(R) E-2136 CPU @ 3.30GHz
Memory: 54.13 GB / 62.51 GB
Container: Yes
Shell: 5.9 - /bin/zsh
Binaries:
Node: 22.9.0 - ~/.nvm/versions/node/v22.9.0/bin/node
npm: 10.8.3 - ~/.nvm/versions/node/v22.9.0/bin/npm
pnpm: 9.5.0 - ~/.nvm/versions/node/v22.9.0/bin/pnpm
Browsers:
Chromium: 129.0.6668.58
npmPackages:
@vitest/web-worker: 2.1.1 => 2.1.1
vitest: 2.1.1 => 2.1.1
### Used Package Manager
npm
### Validations
- [X] Follow our [Code of Conduct](https://github.com/vitest-dev/vitest/blob/main/CODE_OF_CONDUCT.md)
- [X] Read the [Contributing Guidelines](https://github.com/vitest-dev/vitest/blob/main/CONTRIBUTING.md).
- [X] Read the [docs](https://vitest.dev/guide/).
- [X] Check that there isn't [already an issue](https://github.com/vitest-dev/vitest/issues) that reports the same bug to avoid creating a duplicate.
- [X] Check that this is a concrete bug. For Q&A open a [GitHub Discussion](https://github.com/vitest-dev/vitest/discussions) or join our [Discord Chat Server](https://chat.vitest.dev).
- [X] The provided reproduction is a [minimal reproducible example](https://stackoverflow.com/help/minimal-reproducible-example) of the bug.