feat(debug): chromium debugging port

[dgozman]

This exposes Chromium remote debugging pipe under the port PLAYWRIGHT_CHROMIUM_DEBUG_PORT.

[nojvek]

Was looking exactly for this. Your comments say breakpoints won’t work but debugger statements will. Why is that? Is pwa-chrome debugger that different from the current chrome debugger?

Also how does one attach to Firefox and WebKit. I see your PR only has support for chromium.

[dgozman]

Hah, I did not expect comments so fast 😄

Was looking exactly for this.

Could you please tell me more about your scenario? When testing locally, I was not satisfied with just debugging and wanted to open developer tools for dom/css inspection, e.g. to pick a selector. Are you already debugging the page in VSCode, and just want to debug it together with the test?

Your comments say breakpoints won’t work but debugger statements will. Why is that? Is pwa-chrome debugger that different from the current chrome debugger?

That's only for our own Playwright tests. I probably misconfigured the exclude paths so that debugger is scanning our very large checkout that includes browser source trees.

Also how does one attach to Firefox and WebKit. I see your PR only has support for chromium.

Well, VSCode has different debuggers for different browsers, so wiring them up would also be different.

[nojvek]

So I’m working on a little framework that lets us run mocha tests in nodejs or any of playwright supported browsers.

One of my stories is debugging should be as easy as giving an env flag INSPECT=1 and having vscode give the debugging experience in a consistent fashion across different environments. Nodejs is easy with —inspect flag which opens up a port.

Using chromium with debugger port is nice since it allows many clients to connect. (Your PR) So vscode, playwright websocket and even chrome can remote inspect at same time.

I read through a lot of playwright code and figured that chromium right now doesn’t open up a port but simply communicates via a pipe. The port option is also nice if playwright is hosted on the cloud and user can remote debug.

So yeah, really looking forward to this.