Holy clean code

cc.ts

static checkComment(comment: Comment): void {
  function resetCompactMode() { // TODO: props mutation is bad 
    comment.compactMode = false;
  }

  const parent = comment.compactMode && comment.parent;

  if (!parent) { return; }

  if (parent.level === 1 || parent.children.length > 1) {
    resetCompactMode(); 
  } else {
    if (!parent.parent) { return; }

    if (parent.parent.userId !== comment.userId || parent.parent.children.length > 1) {
      resetCompactMode();
    }
  }
}