function with diferent varial's type

examplebymaximilian.ts

type Combinable = number | string;
type ConversionDescriptor = 'as-number' | 'as-text';

function combine(input1: Combinable, input2: Combinable, resultConversation: ConversionDescriptor){
  let result;
  
  if(typeof input1 === 'number' && typeof input2 === 'number' || resultConversation === 'as-number'){
    result = +input1 + +input2;
  }else{
    result = `${input1} ${input2}`;
  }
  return result;
}

const combinedStringAge = combine(12,14, 'as-number')
console.log(combinedStringAge);

const age = combine(12, 14, 'as-number');
console.log(age)
  
const names = combine('Daniela', 'Romero', 'as-text');
console.log(names)