TYPESCRIPT

typescript make function argument optional

        
            
        
     function multiply(a: number, b: number, c?: number): number {

    if (typeof c !== 'undefined') {
        return a * b * c;
    }
    return a * b;
}

how to pass function as a optional props in typescript type

props.onSaveCourse?.('abc', someDate)
props.onSaveGoal?.('abc')

how to pass function as a optional props in typescript type

interface Props {
  type: 'goal' | 'course'
  onSaveCourse?: (title: string, date: Date) => void
  onSaveGoal?: (text: string) => void
}