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"use strict";
exports.__esModule = true;
exports.default = void 0;
var _useCustomEffect = _interopRequireDefault(require("./useCustomEffect"));
var _dequal = require("dequal");
var _useImmediateUpdateEffect = _interopRequireDefault(require("./useImmediateUpdateEffect"));
var _useEventCallback = _interopRequireDefault(require("./useEventCallback"));
var _react = require("react");
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
function isDepsEqual([nextElement, nextConfig], [prevElement, prevConfig]) {
return nextElement === prevElement && (0, _dequal.dequal)(nextConfig, prevConfig);
}
/**
* Observe mutations on a DOM node or tree of DOM nodes.
* Depends on the `MutationObserver` api.
*
* ```tsx
* const [element, attachRef] = useCallbackRef(null);
*
* useMutationObserver(element, { subtree: true }, (records) => {
*
* });
*
* return (
* <div ref={attachRef} />
* )
* ```
*
* @param element The DOM element to observe
* @param config The observer configuration
* @param callback A callback fired when a mutation occurs
*/
/**
* Observe mutations on a DOM node or tree of DOM nodes.
* use a `MutationObserver` and return records as the are received.
*
* ```tsx
* const [element, attachRef] = useCallbackRef(null);
*
* const records = useMutationObserver(element, { subtree: true });
*
* return (
* <div ref={attachRef} />
* )
* ```
*
* @param element The DOM element to observe
* @param config The observer configuration
*/
function useMutationObserver(element, config, callback) {
const [records, setRecords] = (0, _react.useState)(null);
const handler = (0, _useEventCallback.default)(callback || setRecords);
(0, _useCustomEffect.default)(() => {
if (!element) return;
// The behavior around reusing mutation observers is confusing
// observing again _should_ disable the last listener but doesn't
// seem to always be the case, maybe just in JSDOM? In any case the cost
// to redeclaring it is gonna be fairly low anyway, so make it simple
const observer = new MutationObserver(handler);
observer.observe(element, config);
return () => {
observer.disconnect();
};
}, [element, config], {
isEqual: isDepsEqual,
// Intentionally done in render, otherwise observer will miss any
// changes made to the DOM during this update
effectHook: _useImmediateUpdateEffect.default
});
return callback ? void 0 : records || [];
}
var _default = useMutationObserver;
exports.default = _default;