registry method

VoidCallback registry(
  1. K key,
  2. V value
)

Implementation

VoidCallback registry(K key, V value) {
  assert(key != null, 'key must not be null.');
  assert(value != null, 'value must not be null.');

  _maps[key] = value;
  return () {
    _maps.remove(key);
  };
}