console.log from webworker, when using browser runner, does not get captured

Describe the bug

When using the browser runner, if a test starts a webworker, and that worker calls console.log, the log messages are not shown as stdout like log messages from the main thread.

The only way I've found to see the log messages is to run in non-headless mode and open the JavaScript console.

Reproduction

https://stackblitz.com/edit/vitest-dev-vitest-oszejgfz?file=test%2Fbasic.test.ts

System Info

N/A

See stackblitz reproduction.

Used Package Manager

npm

Validations

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• The provided reproduction is a minimal reproducible example of the bug.

Start with the StackBlitz reproduction and test/basic.test.ts, then trace how the browser runner captures stdout from the main thread and a started webworker. Done means console.log messages from the worker appear in stdout during browser-runner tests, including in headless mode.