fn build(self : CanvasBackend, initialize : () -> Unit, game_loop : () -> Unit, canvas_width : Double, canvas_height : Double, fps : UInt) -> (() -> Unit)

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fn draw_picture(self : CanvasBackend, png : String, x~ : Double, y~ : Double, width~ : Double, height~ : Double, transform~ : 
@Milky2018/selene/math.Transform
Transform, repeat~ : Bool) -> Unit

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fn draw_sprite(self : CanvasBackend, sprite_path : String, x~ : Double, y~ : Double, offset_x~ : Double, offset_y~ : Double, width~ : Double, height~ : Double, transform~ : 
@Milky2018/selene/math.Transform
Transform) -> Unit

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fn draw_stroke_rect(self : CanvasBackend, x~ : Double, y~ : Double, width~ : Double, height~ : Double, color~ : String) -> Unit

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fn draw_text(self : CanvasBackend, text : String, x~ : Double, y~ : Double, font~ : String, color~ : String) -> Unit

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fn play_audio(_self : CanvasBackend, audio_path : String, volume~ : Double, loop_~ : Bool) -> Unit

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fn register_key_events(_self : CanvasBackend, pressed_keys : 
@moonbitlang/core/set.Set
Set[
@Milky2018/selene/system.Code
Code]) -> Unit

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fn register_mouse_events(_self : CanvasBackend, mouse : 
@Milky2018/selene/system.Mouse
Mouse) -> Unit

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