TypeScript Functions OverLoads Sample

sailormoon-transform.ts

class Brooch {
  pentagram = 'Silver Crystal';
}

type Compact = {
  silverCrystal: boolean;
};

class CosmicCompact implements Compact {
  silverCrystal = true;
  cosmicPower = true;
}

class CrisisCompact implements Compact {
  silverCrystal = true;
  moonChalice = true;
}

function transform(): void;
function transform(item: Brooch): void;
function transform(item: Compact): void;
function transform(item?: Brooch | Compact): void {
  if (item instanceof Brooch) {
    console.log('Moon crystal power💎, make up!!');
  } else if (item instanceof CosmicCompact) {
    console.log('Moon cosmic power💖, make up!!!');
  } else if (item instanceof CrisisCompact) {
    console.log('Moon crisis🏆, make up!');
  } else if (!item) {
    console.log('Moon prisim power🌙, make up!');
  } else {
    console.log('Item is fake...😖');
  }
}

transform();
transform(new Brooch());
transform(new CosmicCompact());
transform(new CrisisCompact());