Error on `(interface-name) [typescript/tslint]` rule?

Question

I get this tslint error, which I don't understand why. The interface does start with a capital letter.

29 col 11 error| interface name must start with a capitalized I (interface-name) [typescript/tslint]

S> 29 interface Props {
   30   answerQuestion: (answerQuestion: AnswerQuestion) => void;

Answer 1

The interface-name rule requires that all interfaces being with the capital letter I. This is to distinguish interfaces from classes (since an interface is not a value, but a class is). In your case, you could correct your code by naming your interface IProps.