Comment by kalkut

You can make any suitable variation of the following pattern.

You build a DataSource class/prototype with methods such as :

- fetch

- addChangeListener

- removeChangeListener

You extend this class for each data type :

  class CommentsData extends DataSource {
    // Your custom data source with your data treatment and data getters
  }

And you use the Higher-Order Component pattern: https://reactjs.org/docs/higher-order-components.html