server.listen() called after server.close() does not mock response

[vishakha94]

Prerequisites

• I confirm my issue is not in the opened issues
• I confirm the Frequently Asked Questions didn't contain the answer to my issue

Environment check

• I'm using the latest msw version
• I'm using Node.js version 18 or higher

Node.js version

v2.6.6

Reproduction repository

vishakha94@b90344e

Reproduction steps

npm run test:node

Current behavior

We have a NextJS app that implements mocking using feature flag. When we switch the flag off for mocking, we call server.close() and if the feature flag is enabled again, serve.listen() is called.
I observed the following:

1. the first call to server.listen() mocks API properly
2. The second call to server.listen() after server.close() does not mock API

Our NextJS app setup is complicated, but I was able to reproduce the issue here: https://github.com/vishakha94/msw/tree/repro-server-close

I ran npm run test:node

Expected behavior

Expect for MSW to resume mocking after server.listen() is called after sever.close().

[kettanaito]

Hi, @vishakha94. Thanks for reporting this.

I was able to reproduce this issue in isolation in #2383. Will take a look at whats's wrong once I have a moment.

[kettanaito]

Root cause

Calling server.close() triggers this.emitter.removeAllListeners() on the interceptor. Starting the server again doesn't seem to attach those listeners again, causing no request listener to be present to handle the intercepted request.

[kettanaito]

I've pushed the fix to the PR. Once the CI is green, I will merge it.

[kettanaito]

Released: v2.6.8 🎉

This has been released in v2.6.8!

• 📄 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.

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[vishakha94]

Thanks @kettanaito!