jotai/umd/immer.development.js

👻 Next gen state management that will spook you

(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports, require('immer'), require('jotai'), require('react')) :
  typeof define === 'function' && define.amd ? define(['exports', 'immer', 'jotai', 'react'], factory) :
  (global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.jotaiImmer = {}, global.immer, global.jotai, global.React));
})(this, (function (exports, immer, jotai, react) { 'use strict';

  function atomWithImmer(initialValue) {
    var anAtom = jotai.atom(initialValue, function (get, set, fn) {
      return set(anAtom, immer.produce(get(anAtom), typeof fn === 'function' ? fn : function () {
        return fn;
      }));
    });
    return anAtom;
  }

  function useImmerAtom(anAtom, scope) {
    var _useAtom = jotai.useAtom(anAtom, scope),
        state = _useAtom[0],
        setState = _useAtom[1];

    var setStateWithImmer = react.useCallback(function (fn) {
      return setState(immer.produce(fn));
    }, [setState]);
    return [state, setStateWithImmer];
  }

  var getWeakCacheItem = function getWeakCacheItem(cache, deps) {
    do {
      var _deps = deps,
          dep = _deps[0],
          rest = _deps.slice(1);

      var entry = cache.get(dep);

      if (!entry) {
        return;
      }

      if (!rest.length) {
        return entry[1];
      }

      cache = entry[0];
      deps = rest;
    } while (deps.length);
  };

  var setWeakCacheItem = function setWeakCacheItem(cache, deps, item) {
    do {
      var _deps2 = deps,
          dep = _deps2[0],
          rest = _deps2.slice(1);

      var entry = cache.get(dep);

      if (!entry) {
        entry = [new WeakMap()];
        cache.set(dep, entry);
      }

      if (!rest.length) {
        entry[1] = item;
        return;
      }

      cache = entry[0];
      deps = rest;
    } while (deps.length);
  };

  var createMemoizeAtom = function createMemoizeAtom() {
    var cache = new WeakMap();

    var memoizeAtom = function memoizeAtom(createAtom, deps) {
      var cachedAtom = getWeakCacheItem(cache, deps);

      if (cachedAtom) {
        return cachedAtom;
      }

      var createdAtom = createAtom();
      setWeakCacheItem(cache, deps, createdAtom);
      return createdAtom;
    };

    return memoizeAtom;
  };

  var memoizeAtom = createMemoizeAtom();
  function withImmer(anAtom) {
    return memoizeAtom(function () {
      var derivedAtom = jotai.atom(function (get) {
        return get(anAtom);
      }, function (get, set, fn) {
        return set(anAtom, immer.produce(get(anAtom), typeof fn === 'function' ? fn : function () {
          return fn;
        }));
      });
      return derivedAtom;
    }, [anAtom]);
  }

  exports.atomWithImmer = atomWithImmer;
  exports.useImmerAtom = useImmerAtom;
  exports.withImmer = withImmer;

  Object.defineProperty(exports, '__esModule', { value: true });

}));