pokemon.ts

function getAttackPower(pokemon: Pokemon) {
  return pokemon.level * pokemon.attackPower;
}

function defend(pokemon: Pokemon, damage: number) {
  const hp = pokemon.hp - damage;
  return Object.assign({}, pokemon, { hp });
}

function performAttack(attacker: Pokemon, defender: Pokemon) {
  const dmg = getAttackPower(attacker);
  return {
    attacker,
    defender: defend(defender, dmg)
  }
}