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Represents a view model used for data binding. A ViewModel provides structured data that can be read and modified at runtime, allowing Rive files to react to application state. 
type ViewModelExample = {
  character: Input<Artboard<Data.Character>>,
  instance: Artboard<Data.Character>?,
}

function init(self: ViewModelExample, context: Context): boolean
  local vm = Data.Character.new()
  self.instance = self.character:instance(vm)
  return true
end

return function(): Node<ViewModelExample>
  return {
    character = late(),
    instance = nil,
    init = init,
  }
end