[Question] Regarding CDP Session.

I am converting all my puppeteer code which used to look like this.

https://github.com/shirshak55/scrapper-tools/blob/master/src/fastPage/index.ts#L113

const session = await page.target().createCDPSession()
  await session.send("Page.enable")
  await session.send("Page.setWebLifecycleState", {
    state: "active",
  })

So we went to docs and saw this

const client = await page.context().newCDPSession(page);

But now i am seeing error on typescript like this

Property newCDPSession doesn't exists on type BrowserContext

[Niek]

The page parameter is strange indeed, as is the requirement to cast to ChromiumBrowserContext. Since all 3 supported browsers use CDP, it’s unclear to me why the newCDPSession() method is not available in e.g FFBrowserContext.

Edit: I stand corrected, this is not true. See https://github.com/microsoft/playwright/issues/2484#issuecomment-652828709

[Niek]

• Juggler

Since all 3 supported browsers use CDP

@Niek this is not actually the case.

• In Chromium we rely on CDP
• In WebKit we rely on “Web Inspector Remote Debugging Protocol”
• In Firefox we rely on “Juggler” protocol

Apologies @aslushnikov, I assumed Playwright (just like Puppeteer) used CDP for FF now that it’s built-in (and enabled in at least the nightly builds). But reading https://github.com/microsoft/playwright/issues/1765#issuecomment-613178363 that’s not the case until the CDP support in FF is more mature.