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

  var isObject = function isObject(x) {
    return typeof x === 'object' && x !== null;
  };
  var proxyStateMap = new WeakMap();
  var refSet = new WeakSet();
  var buildProxyFunction = function buildProxyFunction(objectIs, newProxy, canProxy, defaultHandlePromise, snapCache, createSnapshot, proxyCache, versionHolder, _proxyFunction) {
    if (objectIs === void 0) {
      objectIs = Object.is;
    }
    if (newProxy === void 0) {
      newProxy = function newProxy(target, handler) {
        return new Proxy(target, handler);
      };
    }
    if (canProxy === void 0) {
      canProxy = function canProxy(x) {
        return isObject(x) && !refSet.has(x) && (Array.isArray(x) || !(Symbol.iterator in x)) && !(x instanceof WeakMap) && !(x instanceof WeakSet) && !(x instanceof Error) && !(x instanceof Number) && !(x instanceof Date) && !(x instanceof String) && !(x instanceof RegExp) && !(x instanceof ArrayBuffer);
      };
    }
    if (defaultHandlePromise === void 0) {
      defaultHandlePromise = function defaultHandlePromise(promise) {
        switch (promise.status) {
          case 'fulfilled':
            return promise.value;
          case 'rejected':
            throw promise.reason;
          default:
            throw promise;
        }
      };
    }
    if (snapCache === void 0) {
      snapCache = new WeakMap();
    }
    if (createSnapshot === void 0) {
      createSnapshot = function (_createSnapshot) {
        function createSnapshot(_x, _x2, _x3) {
          return _createSnapshot.apply(this, arguments);
        }
        createSnapshot.toString = function () {
          return _createSnapshot.toString();
        };
        return createSnapshot;
      }(function (target, version, handlePromise) {
        if (handlePromise === void 0) {
          handlePromise = defaultHandlePromise;
        }
        var cache = snapCache.get(target);
        if ((cache == null ? void 0 : cache[0]) === version) {
          return cache[1];
        }
        var snap = Array.isArray(target) ? [] : Object.create(Object.getPrototypeOf(target));
        proxyCompare.markToTrack(snap, true);
        snapCache.set(target, [version, snap]);
        Reflect.ownKeys(target).forEach(function (key) {
          if (Object.getOwnPropertyDescriptor(snap, key)) {
            return;
          }
          var value = Reflect.get(target, key);
          var _ref = Reflect.getOwnPropertyDescriptor(target, key),
            enumerable = _ref.enumerable;
          var desc = {
            value: value,
            enumerable: enumerable,
            configurable: true
          };
          if (refSet.has(value)) {
            proxyCompare.markToTrack(value, false);
          } else if (value instanceof Promise) {
            delete desc.value;
            desc.get = function () {
              return handlePromise(value);
            };
          } else if (proxyStateMap.has(value)) {
            var _ref2 = proxyStateMap.get(value),
              _target = _ref2[0],
              _ensureVersion = _ref2[1];
            desc.value = createSnapshot(_target, _ensureVersion(), handlePromise);
          }
          Object.defineProperty(snap, key, desc);
        });
        return Object.preventExtensions(snap);
      });
    }
    if (proxyCache === void 0) {
      proxyCache = new WeakMap();
    }
    if (versionHolder === void 0) {
      versionHolder = [1, 1];
    }
    if (_proxyFunction === void 0) {
      _proxyFunction = function proxyFunction(initialObject) {
        if (!isObject(initialObject)) {
          throw new Error('object required');
        }
        var found = proxyCache.get(initialObject);
        if (found) {
          return found;
        }
        var version = versionHolder[0];
        var listeners = new Set();
        var notifyUpdate = function notifyUpdate(op, nextVersion) {
          if (nextVersion === void 0) {
            nextVersion = ++versionHolder[0];
          }
          if (version !== nextVersion) {
            version = nextVersion;
            listeners.forEach(function (listener) {
              return listener(op, nextVersion);
            });
          }
        };
        var checkVersion = versionHolder[1];
        var ensureVersion = function ensureVersion(nextCheckVersion) {
          if (nextCheckVersion === void 0) {
            nextCheckVersion = ++versionHolder[1];
          }
          if (checkVersion !== nextCheckVersion && !listeners.size) {
            checkVersion = nextCheckVersion;
            propProxyStates.forEach(function (_ref3) {
              var propProxyState = _ref3[0];
              var propVersion = propProxyState[1](nextCheckVersion);
              if (propVersion > version) {
                version = propVersion;
              }
            });
          }
          return version;
        };
        var createPropListener = function createPropListener(prop) {
          return function (op, nextVersion) {
            var newOp = [].concat(op);
            newOp[1] = [prop].concat(newOp[1]);
            notifyUpdate(newOp, nextVersion);
          };
        };
        var propProxyStates = new Map();
        var addPropListener = function addPropListener(prop, propProxyState) {
          if (propProxyStates.has(prop)) {
            throw new Error('prop listener already exists');
          }
          if (listeners.size) {
            var remove = propProxyState[3](createPropListener(prop));
            propProxyStates.set(prop, [propProxyState, remove]);
          } else {
            propProxyStates.set(prop, [propProxyState]);
          }
        };
        var removePropListener = function removePropListener(prop) {
          var entry = propProxyStates.get(prop);
          if (entry) {
            var _entry$;
            propProxyStates.delete(prop);
            (_entry$ = entry[1]) == null || _entry$.call(entry);
          }
        };
        var addListener = function addListener(listener) {
          listeners.add(listener);
          if (listeners.size === 1) {
            propProxyStates.forEach(function (_ref4, prop) {
              var propProxyState = _ref4[0],
                prevRemove = _ref4[1];
              if (prevRemove) {
                throw new Error('remove already exists');
              }
              var remove = propProxyState[3](createPropListener(prop));
              propProxyStates.set(prop, [propProxyState, remove]);
            });
          }
          var removeListener = function removeListener() {
            listeners.delete(listener);
            if (listeners.size === 0) {
              propProxyStates.forEach(function (_ref5, prop) {
                var propProxyState = _ref5[0],
                  remove = _ref5[1];
                if (remove) {
                  remove();
                  propProxyStates.set(prop, [propProxyState]);
                }
              });
            }
          };
          return removeListener;
        };
        var baseObject = Array.isArray(initialObject) ? [] : Object.create(Object.getPrototypeOf(initialObject));
        var handler = {
          deleteProperty: function deleteProperty(target, prop) {
            var prevValue = Reflect.get(target, prop);
            removePropListener(prop);
            var deleted = Reflect.deleteProperty(target, prop);
            if (deleted) {
              notifyUpdate(['delete', [prop], prevValue]);
            }
            return deleted;
          },
          set: function set(target, prop, value, receiver) {
            var hasPrevValue = Reflect.has(target, prop);
            var prevValue = Reflect.get(target, prop, receiver);
            if (hasPrevValue && (objectIs(prevValue, value) || proxyCache.has(value) && objectIs(prevValue, proxyCache.get(value)))) {
              return true;
            }
            removePropListener(prop);
            if (isObject(value)) {
              value = proxyCompare.getUntracked(value) || value;
            }
            var nextValue = value;
            if (value instanceof Promise) {
              value.then(function (v) {
                value.status = 'fulfilled';
                value.value = v;
                notifyUpdate(['resolve', [prop], v]);
              }).catch(function (e) {
                value.status = 'rejected';
                value.reason = e;
                notifyUpdate(['reject', [prop], e]);
              });
            } else {
              if (!proxyStateMap.has(value) && canProxy(value)) {
                nextValue = _proxyFunction(value);
              }
              var childProxyState = !refSet.has(nextValue) && proxyStateMap.get(nextValue);
              if (childProxyState) {
                addPropListener(prop, childProxyState);
              }
            }
            Reflect.set(target, prop, nextValue, receiver);
            notifyUpdate(['set', [prop], value, prevValue]);
            return true;
          }
        };
        var proxyObject = newProxy(baseObject, handler);
        proxyCache.set(initialObject, proxyObject);
        var proxyState = [baseObject, ensureVersion, createSnapshot, addListener];
        proxyStateMap.set(proxyObject, proxyState);
        Reflect.ownKeys(initialObject).forEach(function (key) {
          var desc = Object.getOwnPropertyDescriptor(initialObject, key);
          if ('value' in desc) {
            proxyObject[key] = initialObject[key];
            delete desc.value;
            delete desc.writable;
          }
          Object.defineProperty(baseObject, key, desc);
        });
        return proxyObject;
      };
    }
    return [_proxyFunction, proxyStateMap, refSet, objectIs, newProxy, canProxy, defaultHandlePromise, snapCache, createSnapshot, proxyCache, versionHolder];
  };
  var _buildProxyFunction = buildProxyFunction(),
    defaultProxyFunction = _buildProxyFunction[0];
  function proxy(initialObject) {
    if (initialObject === void 0) {
      initialObject = {};
    }
    return defaultProxyFunction(initialObject);
  }
  function getVersion(proxyObject) {
    var proxyState = proxyStateMap.get(proxyObject);
    return proxyState == null ? void 0 : proxyState[1]();
  }
  function subscribe(proxyObject, callback, notifyInSync) {
    var proxyState = proxyStateMap.get(proxyObject);
    if (!proxyState) {
      console.warn('Please use proxy object');
    }
    var promise;
    var ops = [];
    var addListener = proxyState[3];
    var isListenerActive = false;
    var listener = function listener(op) {
      ops.push(op);
      if (notifyInSync) {
        callback(ops.splice(0));
        return;
      }
      if (!promise) {
        promise = Promise.resolve().then(function () {
          promise = undefined;
          if (isListenerActive) {
            callback(ops.splice(0));
          }
        });
      }
    };
    var removeListener = addListener(listener);
    isListenerActive = true;
    return function () {
      isListenerActive = false;
      removeListener();
    };
  }
  function snapshot(proxyObject, handlePromise) {
    var proxyState = proxyStateMap.get(proxyObject);
    if (!proxyState) {
      console.warn('Please use proxy object');
    }
    var _ref6 = proxyState,
      target = _ref6[0],
      ensureVersion = _ref6[1],
      createSnapshot = _ref6[2];
    return createSnapshot(target, ensureVersion(), handlePromise);
  }
  function ref(obj) {
    refSet.add(obj);
    return obj;
  }
  var unstable_buildProxyFunction = buildProxyFunction;

  exports.getVersion = getVersion;
  exports.proxy = proxy;
  exports.ref = ref;
  exports.snapshot = snapshot;
  exports.subscribe = subscribe;
  exports.unstable_buildProxyFunction = unstable_buildProxyFunction;

}));