[Bug]: page evaluate returns undefined for a specific site

[reginaldl]

Version

1.41.2

Steps to reproduce

1. Clone https://github.com/reginaldl/playwright-bug
2. npm install
3. npx playwright test

Expected behavior

page.evaluate should return 42.

Actual behavior

page.evaluate consistently returns undefined on all browsers.

Additional context

page.evaluate returns an unexpected value exclusively when browsing a specific website (see test case for exact address).

Environment

System:
    OS: macOS 14.2.1
    CPU: (10) arm64 Apple M1 Max
    Memory: 32.35 GB / 64.00 GB
  Binaries:
    Node: 21.4.0 - /opt/homebrew/bin/node
    Yarn: 1.22.19 - /opt/homebrew/bin/yarn
    npm: 10.2.4 - /opt/homebrew/bin/npm
  Languages:
    Bash: 3.2.57 - /bin/bash
  npmPackages:
    @playwright/test: ^1.41.2 => 1.41.2

[dgozman]

Investigation notes: this is due to window.eval being overwritten.

[ZooDoo4U]

There is a bug in the repro code...

Should be:
var res = await page.evaluate( async() => 41 + 1)

As you have it, you are evaluating a string?

Would suggest closing as by design...

[reginaldl]

Have you actually tried replacing with a function? It also fails.
Given that the site overwrites window.eval, I'm ok closing this as won't fix.

[ZooDoo4U]

Yes, i did and it worked. But while i ran again my own site and the evaluate worked just fine. Can't help if a rouge site is overwriting stuff, not really a PW issue...

[mxschmitt]

If a site is overriding globalThis.eval we unfortunately can't do much from the Playwright side. Closing as a won't fix.