add a blocked-hook (to determine which element should be blocked by users) about rrweb HOT 5 CLOSED

In the latest release, there is an option to configure the block class name https://github.com/rrweb-io/rrweb/blob/master/src/types.ts#L239

Some previous discussion:
#1
#23

Is the block hook still needed with this implementation? Since the block check may be triggered very frequently, personally I prefer some simple check instead of calling a function.

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Thanks! After reading these, I agree that performance counts. And maybe this configuration helps.

However, I meet a problem. I want to block two elements (class .slide-banner, class .feed-back) in the page when recording. It seems that I can just block one by blockClass.
Or I have to make the maintainers update their code.

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Maybe extend the type of blockClass from string to string | RegExp?

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Good idea. It helps.

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@alienzhou in the 0.7.12 release the block class option now accept RegExp for checking. But there is still one thing left.
We currently apply some styles for the blocked area when replaying, based on injecting some dynamic stylesheets into the <iframe/>.
And I think there is no way to do things like this on RegExp type class name matcher.

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