registerSuperPropertiesOnce method Null safety
Register super properties for events, only if no other super property with the same names has already been registered.
Calling registerSuperPropertiesOnce will never overwrite existing properties.
properties
A Map containing the super properties to register.
Implementation
void registerSuperPropertiesOnce(Map<String, dynamic> properties) {
_channel.invokeMethod<void>('registerSuperPropertiesOnce',
<String, dynamic>{'properties': properties});
}