Typescript decorator

function uppercase( target: any, name: string, desc: PropertyDescriptor ) {
    return {
        get: function (): string {
            return desc.get?.call( this ).toUpperCase();
        },
        set: function ( name: string ) {
            desc.set?.call( this, name.split(' ') );
        }
    };
}

function capitalize(target: any, name: string, desc: PropertyDescriptor){
    return {
        value: function (): string {
            const str = desc.value.call(this);
            return str[0].toUpperCase() + str.slice(1);
        }
    }
}

function addVersion<T extends { new (...args: any[]): any }>(constructor: T): T{
    return class extends constructor {
        static version: string = '1.0';
    }
}

@addVersion
class Person {
    constructor(
        public fname: string, public lname: string,
    ) {}

    @capitalize
    getFirstName(): string {
        return this.fname;
    }

    @capitalize
    getLastName(): string {
        return this.lname;
    }

    @uppercase
    get fullname(): string {
        return this.fname + ' ' + this.lname;
    }

    set fullname( [ fname, lname ] ) {
        this.fname = fname;
        this.lname = lname;
    }
}

var person = new Person( 'ross', 'geller' );
console.log( 'fullname ->', person.fullname );
console.log( 'first name ->', person.getFirstName());
console.log( 'last name ->', person.getLastName());
console.log( 'version ->', (Person as any).version);
// console.log( 'person ->', person );

person.fullname = 'chandler bing';
console.log( 'fullname* ->', person.fullname );
// console.log( 'person* ->', person );