@kiwicom/orbit-components/lib/hooks/useIntersect/index.js

Orbit-components is a React component library which provides developers with the easiest possible way of building Kiwi.com’s products.

"use strict";

exports.__esModule = true;
exports.default = void 0;

var _react = require("react");

const useIntersect = ({
  root = null,
  rootMargin,
  threshold = 0
} = {}) => {
  const [entry, updateEntry] = (0, _react.useState)(null);
  const [node, setNode] = (0, _react.useState)(null);
  const ref = (0, _react.useCallback)(el => {
    setNode(el);
  }, []);
  const observer = (0, _react.useRef)(null);
  (0, _react.useEffect)(() => {
    if ("IntersectionObserver" in window === false) {
      return () => {};
    }

    observer.current = new window.IntersectionObserver(([ent]) => updateEntry(ent), {
      root,
      rootMargin,
      threshold
    });
    const {
      current: currentObs
    } = observer;
    if (node) currentObs == null ? void 0 : currentObs.observe(node);
    return () => currentObs == null ? void 0 : currentObs.disconnect();
  }, [node, root, rootMargin, threshold]);
  return {
    ref,
    entry,
    observer: observer.current
  };
};

var _default = useIntersect;
exports.default = _default;