Make reducer an instance method instead of a static method

[nataly87s]

• the class can be abstract
• it will be more type-safe because you can't pass generic types to static methods in typescript.
• you won't have to pass this to the side-effect

Alternatively - you can pass the reducer function to the constructor, to make sure that the reducer doesn't have access to the class instance. and this is also more type-safe

[philipp-spiess]

My initial approach used instance methods for the reducer. You can find some comments about it in #3

I agree that passing of this as the first argument to the side effect is a a bit ugly but that's also what ReactReason ended up doing: https://github.com/reasonml/reason-react/blob/master/docs/state-actions-reducer.md#state-update-through-reducer

Alternatively - you can pass the reducer function to the constructor, to make sure that the reducer doesn't have access to the class instance. and this is also more type-safe

I'm not quite sure I understand. When you use React, you don't control what is passed to the constructor - React is calling it for you.

[nataly87s]

The ReComponent class is a super class (like react's Component), so the component that extends ReComponent can pass an additional argument to the super constructor

class MyComponent extends ReComponent {
  constructor(props) {
    super(reducer, props);
  } 
}