JAVASCRIPT use-sync-external-store-with-selector.production.js

/**
 * @license React
 * use-sync-external-store-with-selector.production.js
 *
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

"use strict";
var React = require("react");
function is(x, y) {
  return (x === y && (0 !== x || 1 / x === 1 / y)) || (x !== x && y !== y);
}
var objectIs = "function" === typeof Object.is ? Object.is : is,
  useSyncExternalStore = React.useSyncExternalStore,
  useRef = React.useRef,
  useEffect = React.useEffect,
  useMemo = React.useMemo,
  useDebugValue = React.useDebugValue;
exports.useSyncExternalStoreWithSelector = function (
  subscribe,
  getSnapshot,
  getServerSnapshot,
  selector,
  isEqual
) {
  var instRef = useRef(null);
  if (null === instRef.current) {
    var inst = { hasValue: !1, value: null };
    instRef.current = inst;
  } else inst = instRef.current;
  instRef = useMemo(
    function () {
      function memoizedSelector(nextSnapshot) {
        if (!hasMemo) {
          hasMemo = !0;
          memoizedSnapshot = nextSnapshot;
          nextSnapshot = selector(nextSnapshot);
          if (void 0 !== isEqual && inst.hasValue) {
            var currentSelection = inst.value;
            if (isEqual(currentSelection, nextSnapshot))
              return (memoizedSelection = currentSelection);
          }
          return (memoizedSelection = nextSnapshot);
        }
        currentSelection = memoizedSelection;
        if (objectIs(memoizedSnapshot, nextSnapshot)) return currentSelection;
        var nextSelection = selector(nextSnapshot);
        if (void 0 !== isEqual && isEqual(currentSelection, nextSelection))
          return (memoizedSnapshot = nextSnapshot), currentSelection;
        memoizedSnapshot = nextSnapshot;
        return (memoizedSelection = nextSelection);
      }
      var hasMemo = !1,
        memoizedSnapshot,
        memoizedSelection,
        maybeGetServerSnapshot =
          void 0 === getServerSnapshot ? null : getServerSnapshot;
      return [
        function () {
          return memoizedSelector(getSnapshot());
        },
        null === maybeGetServerSnapshot
          ? void 0
          : function () {
              return memoizedSelector(maybeGetServerSnapshot());
            }
      ];
    },
    [getSnapshot, getServerSnapshot, selector, isEqual]
  );
  var value = useSyncExternalStore(subscribe, instRef[0], instRef[1]);
  useEffect(
    function () {
      inst.hasValue = !0;
      inst.value = value;
    },
    [value]
  );
  useDebugValue(value);
  return value;
};