[BUG] - Unable to obtain backgroundPage

Context:

• Playwright Version: 1.1.1
• Operating System: Linux
• Node version: 10.15
• Browser: Chromium 83.0.4103.106 snap

Code Snippet

;(async () => {
    const pathToExtension = require('path').join(__dirname, '../dist')
    const userDataDir = require('path').join(__dirname, '../playwright')

    const browserContext = (await playwright.chromium.launchPersistentContext(userDataDir, {
      headless: false,
      args: [
        `--disable-extensions-except=${pathToExtension}`,
        `--load-extension=${pathToExtension}`,
      ],
    })) as ChromiumBrowserContext

    console.log(browserContext.backgroundPages()) // []
    const backgroundPage = await browserContext.waitForEvent('backgroundpage') // never resolves
  })()

The Chrome Extension loads fine and I can see it. Playing around with it, disabling/re-enabling, opening new tabs etc. doesn’t make a difference. Am I missing something here?

Output with debug flag:

  pw:api => chromium.launchPersistentContext started +0ms
  pw:api => chromium._innerLaunch started +411ms
  pw:api <= chromium._innerLaunch succeeded +132ms
  pw:api => cRBrowserContext._loadDefaultContext started +3ms
  pw:api <= cRBrowserContext._loadDefaultContext succeeded +0ms
  pw:api <= chromium.launchPersistentContext succeeded +1ms
[]
  pw:api => cRBrowserContext.waitForEvent started +9ms
  pw:api <= cRBrowserContext.waitForEvent failed +30s

[vitalishapovalov]

we have the same issue, which feels critical and blocks us from proper debugging process

[aslushnikov]

@karthikiyengar awesome, thank you! I can repro now. This is a bug in CDP; we’ll fix it!

Reproduction script

a.js

const {chromium} = require('playwright');
const path = require('path');

(async () => {
  const pathToExtension = path.join(__dirname, './some-extension');
  const userDataDir = path.join(__dirname, './playwright');

  const browserContext = (await chromium.launchPersistentContext(userDataDir, {
    headless: false,
    args: [
      `--disable-extensions-except=${pathToExtension}`,
      `--load-extension=${pathToExtension}`,
    ],
  }));

  console.log(browserContext.backgroundPages());
  const backgroundPage = await browserContext.waitForEvent('backgroundpage');
  console.log('here');
})();

some-extension/manifest.json

{
  "description": "Outputs something in the console",
  "manifest_version": 2,
  "name": "Demo",
  "version": "1.0",
  "homepage_url": "https://example.com",

  "background": {
    "persistent": false,
    "scripts": ["background-script.js"]
  }
}

some-extension/background-script.js

console.log('i am a background script! Deal with me.');