[Feature] Expose a /json/list endpoint when calling launchServer compatible with the one Chromium publishes

[connor4312]

For VS Code, we are building a way to run unit tests in "serverless"/web mode on browsers. To enable debugging in this scenario, we need to either have playwright attach to the browser the js-debug launches (which I hacked together but sometimes fails and is not recommended) or have js-debug attach to playwright's browser.

Playwright has a launchServer option already. If the launched server exposed a /json/list endpoint roughly compatible with the one Chromium publishes, we'd be able to attach to it. Or, if there was some other way to ask the browser to set up a --remote-debugging-port on a specific port number.

For additional discussion and context, see https://github.com/microsoft/vscode-internalbacklog/issues/2235#issuecomment-875017195

[JoelEinbinder]

I think you linked to an internal issue that I don't have access to :)

You can pass --remote-debugging-port=9222 in the args option of browserType.launchServer. Is there a reason this doesn't work for you?

[connor4312]

That works beautifully. I assumed this wouldn't work, but should have checked 🤦 thanks!