Typescript warning in react-typescript calendar

[taauntik]

Forum post

Steps to reproduce it:

1. Go to this location Calendar\examples\frameworks\react\typescript\basic\src\AppConfig.ts
2. add these code

modes : {
        agenda : {
            // Override previous method to jump by a month
            previous() {
                this.date = DateHelper.add(this.date, -1, 'month');
            },
            // Override next method to jump by a month
            next() {
                this.date = DateHelper.add(this.date, 1, 'month');
            }
        }
    },

3. then you'll see these warnings