How to use "Scriptlet injection" in uBlock Origin

[Nomes77]

If someone sees this issues.

I wanted to learned to add Scriptlet injection in/to uBlock.
How do I know what to add?
Where have I to look?

For instance: On spele.nl there is an anti-adblock. How can I solve that?

[okiehsch]

How do I know what to add?

That's not easy to answer, it depends. ;)
For a start read https://github.com/gorhill/uBlock/wiki/Resources-Library to look at what each injection does and how it basically works.
In most cases you will have to look at the source to see what function you want to disable.
Your example spele.nl is a little bit more complicated.
The site checks if improvedigital.com/pbw/headerlift.min.js has been loaded succesfully, if it concludes that it is blocked it will show the anti adblock message.
You can use a redirection to "trick" the site into believing that the targeted request has not been blocked.

[okiehsch]

Forgot to post the redirection.
||improvedigital.com/*/headerlift.min.js$script,redirect-rule=noop.js,domain=spele.nl
works on my end.

[okiehsch]

For a rather straightforward example of how to fix an issue using an injection look at
uBlockOrigin/uAssets#8969

If you go to the source of that site view-source:https://getpaste.link/
you see

The adblock message is shown if the property "isAdBlockActive" has the value "true".
I added the filter getpaste.link##+js(set, isAdBlockActive, false) to change the value and the anti adblock issue is fixed.

[Nomes77]

@okiehsch Thanks for explaining.
I already looked at https://github.com/gorhill/uBlock/wiki/Resources-Library but didn't how where to look.
Thanks for letting me know you have to look in view-source: