function isBalanced(brackets: string): boolean {
  
  const openings = ['[','{','(']
  const pairs = {
    '(': ')',
    '{':'}',
    '[': ']'
  }
  const stack = [];

  
  if ( brackets.length === 0 ) return true;


  for( const bracket of brackets) {
    if ( openings.includes(bracket) ) {
      stack.push(bracket)
    } else {
      const lastBracket = stack.pop()
      if( pairs[lastBracket] !==  bracket ) return false;
    }
  }
  

  return stack.length === 0;
}

// No modificar: necesario para evaluar el resultado.
export { isBalanced };