Function Optional

Example

// For direct class types:
class MaterialComponent {
  @Optional(Rgb)
  diffuseColor?: Rgb;
}

// For type aliases, use the base runtime class:
// type CollisionCallback = SerializableCallback<...>
class BoundingBoxComponent {
  @Optional(SerializableCallback)  // Use runtime class, not alias
  onCollision?: CollisionCallback;  // Type annotation can use alias
}

const material = new MaterialComponent();
getOptionalType(material, 'diffuseColor') // Returns Rgb
getOptionalType(material, 'onCollision') // Returns SerializableCallback
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