jotai/umd/vanilla.development.js

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

  var keyCount = 0;
  function atom(read, write) {
    var key = "atom" + ++keyCount;
    var config = {
      toString: function toString() {
        return key;
      }
    };
    if (typeof read === 'function') {
      config.read = read;
    } else {
      config.init = read;
      config.read = function (get) {
        return get(config);
      };
      config.write = function (get, set, arg) {
        return set(config, typeof arg === 'function' ? arg(get(config)) : arg);
      };
    }
    if (write) {
      config.write = write;
    }
    return config;
  }

  function _unsupportedIterableToArray(o, minLen) {
    if (!o) return;
    if (typeof o === "string") return _arrayLikeToArray(o, minLen);
    var n = Object.prototype.toString.call(o).slice(8, -1);
    if (n === "Object" && o.constructor) n = o.constructor.name;
    if (n === "Map" || n === "Set") return Array.from(o);
    if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen);
  }
  function _arrayLikeToArray(arr, len) {
    if (len == null || len > arr.length) len = arr.length;
    for (var i = 0, arr2 = new Array(len); i < len; i++) arr2[i] = arr[i];
    return arr2;
  }
  function _createForOfIteratorHelperLoose(o, allowArrayLike) {
    var it = typeof Symbol !== "undefined" && o[Symbol.iterator] || o["@@iterator"];
    if (it) return (it = it.call(o)).next.bind(it);
    if (Array.isArray(o) || (it = _unsupportedIterableToArray(o)) || allowArrayLike && o && typeof o.length === "number") {
      if (it) o = it;
      var i = 0;
      return function () {
        if (i >= o.length) return {
          done: true
        };
        return {
          done: false,
          value: o[i++]
        };
      };
    }
    throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
  }

  var hasInitialValue = function hasInitialValue(atom) {
    return 'init' in atom;
  };
  var isActuallyWritableAtom = function isActuallyWritableAtom(atom) {
    return !!atom.write;
  };
  var cancelPromiseMap = new WeakMap();
  var registerCancelPromise = function registerCancelPromise(promise, cancel) {
    cancelPromiseMap.set(promise, cancel);
    promise.catch(function () {}).finally(function () {
      return cancelPromiseMap.delete(promise);
    });
  };
  var cancelPromise = function cancelPromise(promise, next) {
    var cancel = cancelPromiseMap.get(promise);
    if (cancel) {
      cancelPromiseMap.delete(promise);
      cancel(next);
    }
  };
  var isEqualAtomValue = function isEqualAtomValue(a, b) {
    return 'v' in a && 'v' in b && Object.is(a.v, b.v);
  };
  var isEqualAtomError = function isEqualAtomError(a, b) {
    return 'e' in a && 'e' in b && Object.is(a.e, b.e);
  };
  var hasPromiseAtomValue = function hasPromiseAtomValue(a) {
    return 'v' in a && a.v instanceof Promise;
  };
  var returnAtomValue = function returnAtomValue(atomState) {
    if ('e' in atomState) {
      throw atomState.e;
    }
    return atomState.v;
  };
  var createStore = function createStore() {
    var atomStateMap = new WeakMap();
    var mountedMap = new WeakMap();
    var pendingMap = new Map();
    var stateListeners;
    var mountedAtoms;
    {
      stateListeners = new Set();
      mountedAtoms = new Set();
    }
    var getAtomState = function getAtomState(atom) {
      return atomStateMap.get(atom);
    };
    var setAtomState = function setAtomState(atom, atomState) {
      {
        Object.freeze(atomState);
      }
      var prevAtomState = atomStateMap.get(atom);
      atomStateMap.set(atom, atomState);
      if (!pendingMap.has(atom)) {
        pendingMap.set(atom, prevAtomState);
      }
      if (prevAtomState && hasPromiseAtomValue(prevAtomState)) {
        var _next = 'v' in atomState ? atomState.v instanceof Promise ? atomState.v : Promise.resolve(atomState.v) : Promise.reject(atomState.e);
        cancelPromise(prevAtomState.v, _next);
      }
    };
    var updateDependencies = function updateDependencies(atom, nextAtomState, depSet) {
      var dependencies = new Map();
      var changed = false;
      depSet.forEach(function (a) {
        var aState = a === atom ? nextAtomState : getAtomState(a);
        if (aState) {
          dependencies.set(a, aState);
          if (nextAtomState.d.get(a) !== aState) {
            changed = true;
          }
        } else {
          console.warn('[Bug] atom state not found');
        }
      });
      if (changed || nextAtomState.d.size !== dependencies.size) {
        nextAtomState.d = dependencies;
      }
    };
    var setAtomValue = function setAtomValue(atom, value, depSet) {
      var prevAtomState = getAtomState(atom);
      var nextAtomState = {
        d: (prevAtomState == null ? void 0 : prevAtomState.d) || new Map(),
        v: value
      };
      if (depSet) {
        updateDependencies(atom, nextAtomState, depSet);
      }
      if (prevAtomState && isEqualAtomValue(prevAtomState, nextAtomState) && prevAtomState.d === nextAtomState.d) {
        return prevAtomState;
      }
      setAtomState(atom, nextAtomState);
      return nextAtomState;
    };
    var setAtomError = function setAtomError(atom, error, depSet) {
      var prevAtomState = getAtomState(atom);
      var nextAtomState = {
        d: (prevAtomState == null ? void 0 : prevAtomState.d) || new Map(),
        e: error
      };
      if (depSet) {
        updateDependencies(atom, nextAtomState, depSet);
      }
      if (prevAtomState && isEqualAtomError(prevAtomState, nextAtomState) && prevAtomState.d === nextAtomState.d) {
        return prevAtomState;
      }
      setAtomState(atom, nextAtomState);
      return nextAtomState;
    };
    var readAtomState = function readAtomState(atom, force) {
      if (!force) {
        var atomState = getAtomState(atom);
        if (atomState) {
          atomState.d.forEach(function (_, a) {
            if (a !== atom && !mountedMap.has(a)) {
              readAtomState(a);
            }
          });
          if (Array.from(atomState.d).every(function (_ref) {
            var a = _ref[0],
              s = _ref[1];
            return a === atom || getAtomState(a) === s;
          })) {
            return atomState;
          }
        }
      }
      var depSet = new Set();
      var isSync = true;
      var getter = function getter(a) {
        depSet.add(a);
        if (a === atom) {
          var _aState = getAtomState(a);
          if (_aState) {
            return returnAtomValue(_aState);
          }
          if (hasInitialValue(a)) {
            return a.init;
          }
          throw new Error('no atom init');
        }
        var aState = readAtomState(a);
        return returnAtomValue(aState);
      };
      var controller;
      var setSelf;
      var options = {
        get signal() {
          if (!controller) {
            controller = new AbortController();
          }
          return controller.signal;
        },
        get setSelf() {
          if (!isActuallyWritableAtom(atom)) {
            console.warn('setSelf function cannot be used with read-only atom');
          }
          if (!setSelf && isActuallyWritableAtom(atom)) {
            setSelf = function setSelf() {
              if (isSync) {
                console.warn('setSelf function cannot be called in sync');
              }
              if (!isSync) {
                for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
                  args[_key] = arguments[_key];
                }
                return writeAtom.apply(void 0, [atom].concat(args));
              }
            };
          }
          return setSelf;
        }
      };
      try {
        var value = atom.read(getter, options);
        if (value instanceof Promise) {
          var continuePromise;
          var promise = new Promise(function (resolve, reject) {
            value.then(function (v) {
              promise.status = 'fulfilled';
              promise.value = v;
              resolve(v);
            }, function (e) {
              promise.status = 'rejected';
              promise.reason = e;
              reject(e);
            }).finally(function () {
              setAtomValue(atom, promise, depSet);
            });
            continuePromise = function continuePromise(next) {
              return resolve(next);
            };
          });
          promise.status = 'pending';
          registerCancelPromise(promise, function (next) {
            var _controller;
            if (next) {
              continuePromise(next);
            }
            (_controller = controller) == null ? void 0 : _controller.abort();
          });
          return setAtomValue(atom, promise, depSet);
        }
        return setAtomValue(atom, value, depSet);
      } catch (error) {
        return setAtomError(atom, error, depSet);
      } finally {
        isSync = false;
      }
    };
    var readAtom = function readAtom(atom) {
      return returnAtomValue(readAtomState(atom));
    };
    var addAtom = function addAtom(atom) {
      var mounted = mountedMap.get(atom);
      if (!mounted) {
        mounted = mountAtom(atom);
      }
      return mounted;
    };
    var canUnmountAtom = function canUnmountAtom(atom, mounted) {
      return !mounted.l.size && (!mounted.t.size || mounted.t.size === 1 && mounted.t.has(atom));
    };
    var delAtom = function delAtom(atom) {
      var mounted = mountedMap.get(atom);
      if (mounted && canUnmountAtom(atom, mounted)) {
        unmountAtom(atom);
      }
    };
    var recomputeDependents = function recomputeDependents(atom) {
      var mounted = mountedMap.get(atom);
      mounted == null ? void 0 : mounted.t.forEach(function (dependent) {
        if (dependent !== atom) {
          var prevAtomState = getAtomState(dependent);
          var nextAtomState = readAtomState(dependent);
          if (!prevAtomState || !isEqualAtomValue(prevAtomState, nextAtomState)) {
            recomputeDependents(dependent);
          }
        }
      });
    };
    var writeAtomState = function writeAtomState(atom) {
      var isSync = true;
      var getter = function getter(a) {
        return returnAtomValue(readAtomState(a));
      };
      var setter = function setter(a) {
        var r;
        for (var _len3 = arguments.length, args = new Array(_len3 > 1 ? _len3 - 1 : 0), _key3 = 1; _key3 < _len3; _key3++) {
          args[_key3 - 1] = arguments[_key3];
        }
        if (a === atom) {
          if (!hasInitialValue(a)) {
            throw new Error('atom not writable');
          }
          var prevAtomState = getAtomState(a);
          var nextAtomState = setAtomValue(a, args[0]);
          if (!prevAtomState || !isEqualAtomValue(prevAtomState, nextAtomState)) {
            recomputeDependents(a);
          }
        } else {
          r = writeAtomState.apply(void 0, [a].concat(args));
        }
        if (!isSync) {
          flushPending();
        }
        return r;
      };
      for (var _len2 = arguments.length, args = new Array(_len2 > 1 ? _len2 - 1 : 0), _key2 = 1; _key2 < _len2; _key2++) {
        args[_key2 - 1] = arguments[_key2];
      }
      var result = atom.write.apply(atom, [getter, setter].concat(args));
      isSync = false;
      return result;
    };
    var writeAtom = function writeAtom(atom) {
      for (var _len4 = arguments.length, args = new Array(_len4 > 1 ? _len4 - 1 : 0), _key4 = 1; _key4 < _len4; _key4++) {
        args[_key4 - 1] = arguments[_key4];
      }
      var result = writeAtomState.apply(void 0, [atom].concat(args));
      flushPending();
      return result;
    };
    var mountAtom = function mountAtom(atom, initialDependent) {
      var mounted = {
        t: new Set(initialDependent && [initialDependent]),
        l: new Set()
      };
      mountedMap.set(atom, mounted);
      {
        mountedAtoms.add(atom);
      }
      readAtomState(atom).d.forEach(function (_, a) {
        var aMounted = mountedMap.get(a);
        if (aMounted) {
          aMounted.t.add(atom);
        } else {
          if (a !== atom) {
            mountAtom(a, atom);
          }
        }
      });
      readAtomState(atom);
      if (isActuallyWritableAtom(atom) && atom.onMount) {
        var onUnmount = atom.onMount(function () {
          for (var _len5 = arguments.length, args = new Array(_len5), _key5 = 0; _key5 < _len5; _key5++) {
            args[_key5] = arguments[_key5];
          }
          return writeAtom.apply(void 0, [atom].concat(args));
        });
        if (onUnmount) {
          mounted.u = onUnmount;
        }
      }
      return mounted;
    };
    var unmountAtom = function unmountAtom(atom) {
      var _mountedMap$get;
      var onUnmount = (_mountedMap$get = mountedMap.get(atom)) == null ? void 0 : _mountedMap$get.u;
      if (onUnmount) {
        onUnmount();
      }
      mountedMap.delete(atom);
      {
        mountedAtoms.delete(atom);
      }
      var atomState = getAtomState(atom);
      if (atomState) {
        if (hasPromiseAtomValue(atomState)) {
          cancelPromise(atomState.v);
        }
        atomState.d.forEach(function (_, a) {
          if (a !== atom) {
            var mounted = mountedMap.get(a);
            if (mounted) {
              mounted.t.delete(atom);
              if (canUnmountAtom(a, mounted)) {
                unmountAtom(a);
              }
            }
          }
        });
      } else {
        console.warn('[Bug] could not find atom state to unmount', atom);
      }
    };
    var mountDependencies = function mountDependencies(atom, atomState, prevDependencies) {
      var depSet = new Set(atomState.d.keys());
      prevDependencies == null ? void 0 : prevDependencies.forEach(function (_, a) {
        if (depSet.has(a)) {
          depSet.delete(a);
          return;
        }
        var mounted = mountedMap.get(a);
        if (mounted) {
          mounted.t.delete(atom);
          if (canUnmountAtom(a, mounted)) {
            unmountAtom(a);
          }
        }
      });
      depSet.forEach(function (a) {
        var mounted = mountedMap.get(a);
        if (mounted) {
          mounted.t.add(atom);
        } else if (mountedMap.has(atom)) {
          mountAtom(a, atom);
        }
      });
    };
    var flushPending = function flushPending() {
      while (pendingMap.size) {
        var pending = Array.from(pendingMap);
        pendingMap.clear();
        pending.forEach(function (_ref2) {
          var atom = _ref2[0],
            prevAtomState = _ref2[1];
          var atomState = getAtomState(atom);
          if (atomState) {
            if (atomState.d !== (prevAtomState == null ? void 0 : prevAtomState.d)) {
              mountDependencies(atom, atomState, prevAtomState == null ? void 0 : prevAtomState.d);
            }
            var mounted = mountedMap.get(atom);
            mounted == null ? void 0 : mounted.l.forEach(function (listener) {
              return listener();
            });
          } else {
            console.warn('[Bug] no atom state to flush');
          }
        });
      }
      {
        stateListeners.forEach(function (l) {
          return l();
        });
      }
    };
    var subscribeAtom = function subscribeAtom(atom, listener) {
      var mounted = addAtom(atom);
      var listeners = mounted.l;
      listeners.add(listener);
      flushPending();
      return function () {
        listeners.delete(listener);
        delAtom(atom);
      };
    };
    var restoreAtoms = function restoreAtoms(values) {
      for (var _iterator = _createForOfIteratorHelperLoose(values), _step; !(_step = _iterator()).done;) {
        var _step$value = _step.value,
          atom = _step$value[0],
          value = _step$value[1];
        if (hasInitialValue(atom)) {
          setAtomValue(atom, value);
          recomputeDependents(atom);
        }
      }
      flushPending();
    };
    {
      return {
        get: readAtom,
        set: writeAtom,
        sub: subscribeAtom,
        res: restoreAtoms,
        dev_subscribe_state: function dev_subscribe_state(l) {
          stateListeners.add(l);
          return function () {
            stateListeners.delete(l);
          };
        },
        dev_get_mounted_atoms: function dev_get_mounted_atoms() {
          return mountedAtoms.values();
        },
        dev_get_atom_state: function dev_get_atom_state(a) {
          return atomStateMap.get(a);
        },
        dev_get_mounted: function dev_get_mounted(a) {
          return mountedMap.get(a);
        }
      };
    }
  };
  var defaultStore;
  var getDefaultStore = function getDefaultStore() {
    if (!defaultStore) {
      defaultStore = createStore();
    }
    return defaultStore;
  };

  exports.atom = atom;
  exports.createStore = createStore;
  exports.getDefaultStore = getDefaultStore;

}));