boolean() in JavaScript?

Trying to figure out how to do this in JS

 boolean enemyInRange() {
   enemies = GameObject.FindGameObjectsWithTag("team2"); 
   if(enemies.Length > 0) {
         targetEnemy = enemies[0];
         var dist = Vector3.Distance(transform.position, enemies[0].transform.position);
  
         for(var i=0;i<enemies.Length;i++) {
             var tempDist = Vector3.Distance(transform.position, enemies[i].transform.position);
             if(tempDist < dist) {
                 targetEnemy = enemies[i];
                 Debug.Log("Distance from enemy: "+tempDist);
             }
         }
    }
    
    if(tempDist < 5) {
            return true;
    }
     return false;
 }

boolean EnemyInRange() { is how you do it in Java,C++,C#, ETC... guess it's a bit different in "UnityScript"

 : 'boolean' is not a valid macro