// On page initialization loader is already visible, so initial value is 1
let stack = 1;

export function show(): void {
  if (++stack >= 0) {
    const loader = document.getElementById('loader');

    if (!loader) {
      throw new Error('Can not find loader element');
    }

    loader.classList.add('is-active');
  }
}

export function hide(): void {
  if (--stack <= 0) {
    stack = 0;
    const loader = document.getElementById('loader');

    if (!loader) {
      throw new Error('Can not find loader element');
    }

    loader.classList.remove('is-active', 'is-first-launch');
  }
}