Ah I see, when BasePHP was updated, the new method signature needed to be reflected in IsomorphicLocalPHP and WebPHPEndpoint.

That reminds me, I was trying to get access to BasePHP.addServerGlobalEntry, so I can set server constants to $_SERVER from the Playground client. To expose this method as part of the public API, I found several places that (may) need to be updated: WebPHPEndpoint, IsomorphicLocalPHP, PHPBrowser, and PHPRequestHandler. The clue that I followed was where the method pathToInternalUrl and internalUrlToPath were being defined. In the end, I couldn't get addServerGlobalEntry to remember the properties across PHP requests, it seems they're freshly defined every time.

Yes, addServerGlobalEntry is per-request. Would you share more why it would be useful for you to retain it across many requests? And also the amount of types to update is quite overwhelming, it would be nice to at least ensure TypeScript tells you about them, or, ideally, only have a single location to change.

addServerGlobalEntry is per-request

I see, I was trying to use it to pass some constants for a plugin running on the embedded site, so it can detect that it's within a custom Playground environment. It would have been convenient to have a way to persist some values across requests, but upon reflection, it makes sense the $_SERVER variable needs to be freshly populated, since in PHP the universe is created and destroyed on every request.

I'm still figuring out a comfortable way to communicate between the Playground host and the code running on the embedded website. So far I've been using a queue of messages in the database to send and receive data/actions.

amount of types to update.. ensure TypeScript tells you about them, or, ideally, only have a single location to change

The number of places where pathToInternalUrl and internalUrlToPath were defined, it was difficult to understand the class inheritance and subtle differences between each definition. I'm guessing part of the complexity is a translation layer that converts method calls into worker requests.

Anyway, I'm enjoying getting familiar with the code, learning the logic and thoughts behind it.

I'm still figuring out a comfortable way to communicate between the Playground host and the code running on the embedded website.

Would the post_message_to_js api fully solve it for you? Or would it still leave an unaddressed need or two? (We could follow up in that PR)

@eliot-akira I just opened #514 to keep track of the complexity issue