Function GDNativeLibrary.singleton

If true, Godot loads the library at startup rather than the first time a script uses the library, calling {prefix}gdnative_singleton after initializing the library (where {prefix} is the value of symbolPrefix). The library remains loaded as long as Godot is running. Note: A singleton library cannot be reloadable.

bool singleton() nothrow @property @nogc;

void singleton (
  bool v
) nothrow @property @nogc;