Function change

packages/use-subscription/src/__tests__/useSubscription-test.js:484–488

(value)

      _callbacks: [],
      _value: true,
      change(value) {
        eventHandler._value = value;
        const _callbacks = eventHandler._callbacks.slice(0);
        _callbacks.forEach(callback => callback(value));
      },
      getValue() {
        return eventHandler._value;
      },