typeit/src/helpers/fireWhenVisible.ts

The most versatile animated typing utility on the planet.

export default (element: HTMLElement, func: Function): void => {
  let observer = new IntersectionObserver(
    (entries, observer) => {
      entries.forEach((entry) => {
        if (entry.isIntersecting) {
          func();
          observer.unobserve(element);
        }
      });
    },
    { threshold: 1.0 },
  );

  observer.observe(element);
};