Ability to use msw for ws mocks in non-Node runtimes like Bun

[maurice]

Scope

Improves an existing behavior

Compatibility

• This is a breaking change

Feature description

I'm trying to write a unit test with msw's ws support. However I'm running the tests in Bun with Bun's test-runner.

Unfortunately when initialising the msw server I get

# Unhandled error between tests
-------------------------------
1 | (function (entry, fetcher)
              ^
SyntaxError: Export named 'HTTPParser' not found in module 'http'.
-------------------------------

So clearly this is an area where Bun's node emulation is incomplete.

On the Bun side it was already reported here oven-sh/bun#15535 (closed as unplanned), but again (this time referencing msw) here oven-sh/bun#13072 which is open but it's not clear when/if it will be picked up.

In the meantime, I wonder if there is something that msw could do. Eg perhaps there's a standalone HTTP parser that could be used instead?

For now I might have to switch from Bun to Node test-runner just because of this 😢 unless you can suggest something?