fix macro not running without explicit import

standalone-openfl-app/build.hxml

@@ -25,4 +25,5 @@
 --macro keep("Main")
 --macro keep("Assets")
 --macro keep("AssetMacro")
+--macro macros.AssetMacro.includeAssets()
 # --macro macros.MacroLoader.run()

standalone-openfl-app/src/Main.hx

@@ -1,7 +1,6 @@
 package;
 
 import openfl.display.Sprite;
-import Assets; // Forces @:build(macros.AssetMacro.build()) to run.
 
 class Main extends Sprite {
     public function new() {

standalone-openfl-app/src/macros/AssetMacro.hx

@@ -16,6 +16,11 @@ class AssetMacro {
     // Track all assets processed
     private static var assetMap:Map<String, Array<{id:String, path:String, size:Int, type:String}>> = new Map();
 
+    /** Force Assets to be typed, which invokes its @:build macro. */
+    public static function includeAssets():Void {
+        Context.getType("Assets");
+    }
+    
     /**
      * Entry point for the macro - called during compilation
      */