On Sat, Mar 7, 2015 at 8:55 AM, Darin Adler <da...@apple.com> wrote: > Why do we have [Conditional=] in our IDL files? Perhaps because some ports > lacked a way to do #if in the past?
I think Conditional is a nicer/newer way of if-defing based on feature flags. > Should we use #if or [Conditional]? See for example, HTMLMediaElement.idl, > which has a mix of both styles. It's pretty ugly how the #if look in the > IDL files, but even worse is a seemingly random mix of both #if and > [Conditional]. > We should use Conditional as much as possible. As far as I know one area we can't use Conditional= is if something depends on multiple feature flags or if it's specific to a binding language (JS/Objective-C/etc...). We should probably add a special feature flag for that; e.g. Conditional=JS. - R. Niwa
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