open method
Implementation
DynamicLibrary open(String key) {
if (_loadedLibraries.containsKey(key)) {
return _loadedLibraries[key]!;
}
final filename = _filenames[key];
if (filename == null) {
throw ArgumentError('Unknown library key: $key');
}
final lib = DynamicLibrary.open(filename);
_loadedLibraries[key] = lib;
return lib;
}