I will, and thanks. DOES it fall under the warning of 'don't use this if you want 100% compiler-neutrality?
Andrew Wetmore Assistant VP, Marketing and Publicity, The ASF <http://aparch.org> Editor-Writer, Infra team, The ASF Editor, moosehousepress.com <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> Virus-free.www.avast.com <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> On Mon, Jan 26, 2026 at 4:04 PM Josh Tynjala <[email protected]> wrote: > I don't think I added it to the right sidebar. Go ahead and add it, if you > like. > > I added it to the list of "New ActionScript language features" on the AS3 > page, though. > > -- > Josh Tynjala > Bowler Hat LLC > https://bowlerhat.dev/ > > > On Mon, Jan 26, 2026 at 11:58 AM Andrew Wetmore <[email protected]> > wrote: > > > This is a great add. > > > > Did you include this new page in the index of site pages that appears on > > the right? I don't see it. I can add it, if you like. > > > > And does this feature fall into the category of "New ActionScript > language > > features in Royale" on https://apache.github.io/royale-docs/features/as3 > ? > > These come with a caution not to use them if you want your app to be 100% > > compiler-neutral. > > > > a > > > > > > Andrew Wetmore > > Assistant VP, Marketing and Publicity, The ASF <http://aparch.org> > > Editor-Writer, Infra team, The ASF > > > > Editor, moosehousepress.com > > > > > > < > > > https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail > > > > > Virus-free.www.avast.com > > < > > > https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail > > > > > <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> > > > > On Tue, Jan 20, 2026 at 4:33 PM Harbs <[email protected]> wrote: > > > > > Thank you Josh!!! > > > > > > This is probably my #1 feature I’ve been missing in ActionScript. > > > > > > This will do a world of good for type safety and being able to express > > > required types! > > > > > > I’m looking forward to making use of this! > > > > > > Harbs > > > > > > > On Jan 20, 2026, at 10:29 PM, Josh Tynjala < > [email protected]> > > > wrote: > > > > > > > > Hi folks, > > > > > > > > I just wanted to take a moment to highlight a new ActionScript > language > > > > feature that I recently implemented in Royale's compiler: Function > type > > > > expressions. Or perhaps you might call them strict function types. > > > > > > > > Basically, instead of using the Function type, like this: > > > > > > > > var validate:Function; > > > > > > > > You can define the function signature as a type, like this (The > syntax > > is > > > > pretty similar to TypeScript's): > > > > > > > > var validate:(input:String)=>Boolean; > > > > > > > > And then, the compiler can check for mismatches. The following > > assignment > > > > will fail: > > > > > > > > var validate:(input:String)=>Boolean = > > function(input:ByteArray):Boolean > > > { > > > > return false; } > > > > > > > > It should give the following error: > > > > > > > > Error: Implicit coercion of a value of type > (input:ByteArray)=>Boolean > > to > > > > an unrelated type (input:String)=>Boolean. > > > > > > > > The syntax supports optional parameters and rest parameters. Optional > > > > parameters would be equivalent to parameters that have a default > value > > > in a > > > > regular function signature. However, you don't need to specify the > > > default > > > > value in the function type expression (assigned functions are allowed > > to > > > > have different default values or to use rest instead), and you may > use > > > the > > > > ? token to indicate that a specific parameter is optional. > > > > > > > > var func:(s?:String, ...rest):void; > > > > > > > > You can even nest function type expressions. > > > > > > > > var action:(callback:(result:Object)=>void):void; > > > > > > > > I've created some documentation to help folks get started: > > > > > > > > > > https://apache.github.io/royale-docs/features/as3/strict-function-types > > > > > > > > -- > > > > Josh Tynjala > > > > Bowler Hat LLC > > > > https://bowlerhat.dev/ > > > > > > > > >
