You can pass simple 'info' objects. So long as they're just raw objects/data and don't expose methods. The main idea is that interactions between components is

You can pass simple 'info' objects. So long as they're just raw objects/data and don't expose methods. The main idea is that interactions between components is about messaging/communication. Parent components give their children the necessary info to do their jobs but the implementation details of how they do it is fully encapsulated within the children components. When components start passing other components to each other, they're no longer merely communicating with each other, but they are attempting to micromanage each other's functionality. It's a failure of the separation of concerns principle. There are always alternative approaches; for example, the child can emit/trigger an event to let the parent component know that a low-level condition occurred, but let the parent decide how to handle it because the parent is responsible for that higher level of abstraction. This is not a new concept I invented, it's essentially what Alan Kay (the inventor of OOP) said decades ago. He said that OOP is about messaging. There can be exceptions to the rule, but the idea is to keep those exceptions to a minimum.