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Release Notes

Dear community,

On behalf of the Haxe Foundation I am proud to announce that Haxe 3.4.0-rc1 is now officially released! It is available along with the changelog at

We went from the 3.3.0 RC to a new version because many things changed internally. The HashLink target is now fully operational and the compiler had many improvements to its IDE support capabilities.

Despite this being labeled a new minor version, we've fixed tons of bugs and implemented a variety of general improvements. Overall code output quality has increased further and several minor optimizations are in place.

Please test your Haxe code with this version and let us know if you come across any problems at

Thank you for your support

Change Log

New features:

  • all : support metadata completion
  • all : support type-hint completion
  • all : added @signature display mode (#4758)
  • all : finalized HashLink (HL) target


  • all : fixed various optimization issues
  • all : fixed various issues with side-effect detection
  • all : fixed performance drain in the DCE implementation (#5716)
  • all : fixed issue with assignments when inlining constructor (#5340)
  • all : fixed major inlining issue when using compilation server (#5320)
  • all : fixed pattern matching evaluation order issue (#5274)
  • cpp : fixed various minor code generation issues
  • js : fixed issue regarding iterating over abstracts (#5385)
  • python : fixed evaluation order issue for array writing (#5366)

General improvements and optimizations:

  • all : greatly improved support for display mode in general
  • all : made --times output look much nicer
  • all : remove calls to functions that have no side-effect
  • all : hid private property accessors from completion (#5678)
  • js : updated jQuery extern (js.jquery.*) for jQuery 1.12.4 / 3.1.0 support.
  • js : jQuery extern (js.jquery.*) now includes deprecated fields marked with @:deprecated.
  • js : no longer rewrite o["s"] to o.s (#5724)
  • cpp : greatly improved ObjC output and integration options
  • lua : greatly improved code output quality

Standard Library:

  • all : added Any type (#5500)
  • all : added haxe.extern.AsVar
  • all : added haxe.macro.CompilationServer (experimental)
  • all : fixed haxe.Template.resolve (#5301)

Getting Started With Haxe

Now that you've downloaded Haxe, you can get started with a specific platform. Click on a logo to learn how to set up the development environment and how to proceed from there:

For getting started with Haxe, take a look at our introduction, read through the Haxe Manual or look at these use cases for Haxe, including tutorials and popular libraries: