shouldSubscribe only works when propsToWatch is provided

[vladbalan]

It appears that shouldSubscribe only works as intended when propsToWatch is also provided in the options object, otherwise both currentProps and nextProps are equal to empty objects.

const options = {
  // propsToWatch: ['prop1', 'prop2', 'lastProp'],
  shouldSubscribe(currentProps, nextProps) {
    console.log('nextProps', nextProps); // returns {}
    console.log('currentProps', currentProps); // returns {}
  },
};

If propsToWatch is not provided, it defaults to null (

react-komposer/src/compose.js

Line 14 in a51a44d

propsToWatch = null, // Watch all the props.

) and pick(props, null) === {} (

react-komposer/src/compose.js

Line 59 in a51a44d

const nextProps = pick(props, propsToWatch);

).