fix: transfer mocked response as ArrayBuffer to the worker

[kettanaito]

GitHub

• Fixes MSW fails to resolve response on Safari #1324
• Fixes The response is intermittently not returned in the Firefox. #1325

Changes

• Removes the streaming of mocked responses from the client to the worker. I've come to realize this internal change introduced more problems than issues it solved. We should design proper stream support in Support ReadableStream as a mocked response body #1336, and we may need to wait for all browsers to support sending ReadableStream as a transfer object on postMessage().
• Refactors the worker message channel to support transport in postMessage().
• Sends mocked response body as ArrayBuffer to the worker.
• Removes INTERNAL_ERROR worker event. Internal (request handler) errors are handled in the library now, and the library sends a regular mocked response to the worker in their case.
• Changes the shape of the object transferred from the client to the worker.

Roadmap

• Ensure this change doesn't introduce a regression of ReadableStream object could not be cloned when trying to use stream as a mocked response body #581

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit 938fa40:

Sandbox	Source
MSW React	Configuration

[kettanaito]

This change can't introduce a regression because ReadableStream as a mocked response body is not yet supported.

[kettanaito]

Hi, @95th 👋 Please, would you have a minute to review these changes? Thank you.

[kettanaito]

Released: v0.44.2 🎉

This has been released in v0.44.2!

• 📄 Release notes
• 📦 npm package

Make sure to always update to the latest version (npm i msw@latest) to get the newest features and bug fixes.

---

Predictable release automation by @ossjs/release.