How to automatically start the debugging session in Playwright?

Question

I want to automatically start the debugging session instead of having it starting as paused. I found out that adding this code makes it work but it feels hackish to me:

context.add_init_script("setTimeout(window.__pw_resume, 500)")

Without the setTimeout, it won't work. Am I doing anything wrong?

Christian Baumann · Accepted Answer · 2025-04-14 07:28:30Z

2

__pw_resume isn’t defined immediately, so a short delay is needed.

As of now, there’s no official setting to start unpaused, so this workaround necessary.

answered Apr 14 at 7:28

Christian Baumann

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2 Comments

antoyo Apr 14 at 14:52

It actually seems to be defined. Logging window.__pw_resume in the console shows a function. Do you mean that some internal state of this function/Playwright is not ready and that's why it doesn't work? If so, do you know which state it is so I can come up with a better solution to detect when it's ready?

Christian Baumann Apr 15 at 5:14

Yes, __pw_resume is defined early, but the debugger environment isn’t fully initialized. There’s no official event or doc exposing when it’s actually ready, so a delay is still the most reliable workaround.

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