@catho/quantum/InfiniteScroll/hooks/useMutationObserver.js

Catho react components

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.useMutationObservable = void 0;
var _react = require("react");
function _slicedToArray(r, e) { return _arrayWithHoles(r) || _iterableToArrayLimit(r, e) || _unsupportedIterableToArray(r, e) || _nonIterableRest(); }
function _nonIterableRest() { throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }
function _unsupportedIterableToArray(r, a) { if (r) { if ("string" == typeof r) return _arrayLikeToArray(r, a); var t = {}.toString.call(r).slice(8, -1); return "Object" === t && r.constructor && (t = r.constructor.name), "Map" === t || "Set" === t ? Array.from(r) : "Arguments" === t || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(t) ? _arrayLikeToArray(r, a) : void 0; } }
function _arrayLikeToArray(r, a) { (null == a || a > r.length) && (a = r.length); for (var e = 0, n = Array(a); e < a; e++) n[e] = r[e]; return n; }
function _iterableToArrayLimit(r, l) { var t = null == r ? null : "undefined" != typeof Symbol && r[Symbol.iterator] || r["@@iterator"]; if (null != t) { var e, n, i, u, a = [], f = !0, o = !1; try { if (i = (t = t.call(r)).next, 0 === l) { if (Object(t) !== t) return; f = !1; } else for (; !(f = (e = i.call(t)).done) && (a.push(e.value), a.length !== l); f = !0); } catch (r) { o = !0, n = r; } finally { try { if (!f && null != t["return"] && (u = t["return"](), Object(u) !== u)) return; } finally { if (o) throw n; } } return a; } }
function _arrayWithHoles(r) { if (Array.isArray(r)) return r; } /* eslint-disable no-undef */ /* eslint-disable consistent-return */ /* eslint-disable import/prefer-default-export */
var DEFAULT_OPTIONS = {
  config: {
    attributes: true,
    childList: true,
    subtree: true
  }
};
var useMutationObservable = exports.useMutationObservable = function useMutationObservable(_ref) {
  var targetEl = _ref.targetEl,
    callback = _ref.callback,
    _ref$options = _ref.options,
    options = _ref$options === void 0 ? DEFAULT_OPTIONS : _ref$options;
  var _useState = (0, _react.useState)(undefined),
    _useState2 = _slicedToArray(_useState, 2),
    observer = _useState2[0],
    setObserver = _useState2[1];
  (0, _react.useEffect)(function () {
    var obs = new MutationObserver(callback);
    setObserver(obs);
  }, [callback, options, setObserver]);
  (0, _react.useEffect)(function () {
    if (!observer || !targetEl) return;
    var config = options.config;
    observer.observe(targetEl, config);
    return function () {
      if (observer) {
        observer.disconnect();
      }
    };
  }, [observer, targetEl, options]);
};