function _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _nonIterableRest(); } function _nonIterableRest() { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } function _iterableToArrayLimit(arr, i) { if (!(Symbol.iterator in Object(arr) || Object.prototype.toString.call(arr) === "[object Arguments]")) { return; } var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"] != null) _i["return"](); } finally { if (_d) throw _e; } } return _arr; } function _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; } import { shallowEqual } from '@react-dnd/shallowequal'; import { useState, useCallback } from 'react'; import { useIsomorphicLayoutEffect } from './useIsomorphicLayoutEffect'; /** * * @param monitor The monitor to collect state from * @param collect The collecting function * @param onUpdate A method to invoke when updates occur */ export function useCollector(monitor, collect, onUpdate) { var _useState = useState(function () { return collect(monitor); }), _useState2 = _slicedToArray(_useState, 2), collected = _useState2[0], setCollected = _useState2[1]; var updateCollected = useCallback(function () { var nextValue = collect(monitor); if (!shallowEqual(collected, nextValue)) { setCollected(nextValue); if (onUpdate) { onUpdate(); } } }, [collected, monitor, onUpdate]); // update the collected properties after the first render // and the components are attached to dnd-core useIsomorphicLayoutEffect(updateCollected, []); return [collected, updateCollected]; }