for typescript, how to define an interface inside a class-CodePudding

in typescript,the normal codes present like this

interface Animal {
    dateOfBirth: any;
}

class AnimalHouse {
    greeting(pa:Animal){
        console.log(pa.dateOfBirth);
    }
}

I have not found out any explicit usage about this, is there anyway to put interface declaration inside the class

CodePudding user response：

You can define the type inline in the argument list - this'll make the code shorter and easily encapsulated, but you'll lose the Animal name, which can be a disadvantage.

class AnimalHouse {
    greeting(pa: { dateOfBirth: any }){
        console.log(pa.dateOfBirth);
    }
}

You can also use an IIFE to create types scoped only for a particular class.

const AnimalHouse = (() => {
    type Animal = {
        dateOfBirth: any;
    }
    return class AnimalHouse {
        greeting(pa: Animal) {
            console.log(pa.dateOfBirth);
        }
    }
})();