Improve mapStateToProps invariant validation error message #309
Description
During refactoring of my stores I more than once hit an invariant violation like this:
Uncaught Invariant Violation: `mapStateToProps` must return an object. Instead received "A string".
Uncaught Invariant Violation: `mapStateToProps` must return an object. Instead received .
It would be nice of the name of the connected component would also be part of the error message
The latter error message above is from an "undefined" return I guess, so it should print that in the error message:
Uncaught Invariant Violation: 'ComponentName mapStateToProps' must return an object. Instead received undefined