react-native-slowlog | performance timer based profiler for React Native | Monitoring library

You only need to use the constructor if you are initializing state or binding functions.

If you don’t initialize state and you don’t bind methods, you don’t need to implement a constructor for your React component. https://reactjs.org/docs/react-component.html#constructor

So for what the library you linked to does, you do need to call it in the constructor. It both initializes the state and binds to the shouldComponentUpdate function.

However, if you aren't binding to anything you could always initialize the state directly on the property like this...

Typescript