feiYi/node_modules/@vue/reactivity/dist/reactivity.global.js

var VueReactivity = (function (exports) {
  'use strict';

  /**
   * Make a map and return a function for checking if a key
   * is in that map.
   * IMPORTANT: all calls of this function must be prefixed with
   * \/\*#\_\_PURE\_\_\*\/
   * So that rollup can tree-shake them if necessary.
   */
  function makeMap(str, expectsLowerCase) {
      const map = Object.create(null);
      const list = str.split(',');
      for (let i = 0; i < list.length; i++) {
          map[list[i]] = true;
      }
      return expectsLowerCase ? val => !!map[val.toLowerCase()] : val => !!map[val];
  }

  const extend = Object.assign;
  const hasOwnProperty$1 = Object.prototype.hasOwnProperty;
  const hasOwn = (val, key) => hasOwnProperty$1.call(val, key);
  const isArray = Array.isArray;
  const isMap = (val) => toTypeString(val) === '[object Map]';
  const isFunction = (val) => typeof val === 'function';
  const isString = (val) => typeof val === 'string';
  const isSymbol = (val) => typeof val === 'symbol';
  const isObject = (val) => val !== null && typeof val === 'object';
  const objectToString = Object.prototype.toString;
  const toTypeString = (value) => objectToString.call(value);
  const toRawType = (value) => {
      // extract "RawType" from strings like "[object RawType]"
      return toTypeString(value).slice(8, -1);
  };
  const isIntegerKey = (key) => isString(key) &&
      key !== 'NaN' &&
      key[0] !== '-' &&
      '' + parseInt(key, 10) === key;
  const cacheStringFunction = (fn) => {
      const cache = Object.create(null);
      return ((str) => {
          const hit = cache[str];
          return hit || (cache[str] = fn(str));
      });
  };
  /**
   * @private
   */
  const capitalize = cacheStringFunction((str) => str.charAt(0).toUpperCase() + str.slice(1));
  // compare whether a value has changed, accounting for NaN.
  const hasChanged = (value, oldValue) => !Object.is(value, oldValue);
  const def = (obj, key, value) => {
      Object.defineProperty(obj, key, {
          configurable: true,
          enumerable: false,
          value
      });
  };

  function warn(msg, ...args) {
      console.warn(`[Vue warn] ${msg}`, ...args);
  }

  let activeEffectScope;
  class EffectScope {
      constructor(detached = false) {
          this.detached = detached;
          /**
           * @internal
           */
          this._active = true;
          /**
           * @internal
           */
          this.effects = [];
          /**
           * @internal
           */
          this.cleanups = [];
          this.parent = activeEffectScope;
          if (!detached && activeEffectScope) {
              this.index =
                  (activeEffectScope.scopes || (activeEffectScope.scopes = [])).push(this) - 1;
          }
      }
      get active() {
          return this._active;
      }
      run(fn) {
          if (this._active) {
              const currentEffectScope = activeEffectScope;
              try {
                  activeEffectScope = this;
                  return fn();
              }
              finally {
                  activeEffectScope = currentEffectScope;
              }
          }
          else {
              warn(`cannot run an inactive effect scope.`);
          }
      }
      /**
       * This should only be called on non-detached scopes
       * @internal
       */
      on() {
          activeEffectScope = this;
      }
      /**
       * This should only be called on non-detached scopes
       * @internal
       */
      off() {
          activeEffectScope = this.parent;
      }
      stop(fromParent) {
          if (this._active) {
              let i, l;
              for (i = 0, l = this.effects.length; i < l; i++) {
                  this.effects[i].stop();
              }
              for (i = 0, l = this.cleanups.length; i < l; i++) {
                  this.cleanups[i]();
              }
              if (this.scopes) {
                  for (i = 0, l = this.scopes.length; i < l; i++) {
                      this.scopes[i].stop(true);
                  }
              }
              // nested scope, dereference from parent to avoid memory leaks
              if (!this.detached && this.parent && !fromParent) {
                  // optimized O(1) removal
                  const last = this.parent.scopes.pop();
                  if (last && last !== this) {
                      this.parent.scopes[this.index] = last;
                      last.index = this.index;
                  }
              }
              this.parent = undefined;
              this._active = false;
          }
      }
  }
  function effectScope(detached) {
      return new EffectScope(detached);
  }
  function recordEffectScope(effect, scope = activeEffectScope) {
      if (scope && scope.active) {
          scope.effects.push(effect);
      }
  }
  function getCurrentScope() {
      return activeEffectScope;
  }
  function onScopeDispose(fn) {
      if (activeEffectScope) {
          activeEffectScope.cleanups.push(fn);
      }
      else {
          warn(`onScopeDispose() is called when there is no active effect scope` +
              ` to be associated with.`);
      }
  }

  const createDep = (effects) => {
      const dep = new Set(effects);
      dep.w = 0;
      dep.n = 0;
      return dep;
  };
  const wasTracked = (dep) => (dep.w & trackOpBit) > 0;
  const newTracked = (dep) => (dep.n & trackOpBit) > 0;
  const initDepMarkers = ({ deps }) => {
      if (deps.length) {
          for (let i = 0; i < deps.length; i++) {
              deps[i].w |= trackOpBit; // set was tracked
          }
      }
  };
  const finalizeDepMarkers = (effect) => {
      const { deps } = effect;
      if (deps.length) {
          let ptr = 0;
          for (let i = 0; i < deps.length; i++) {
              const dep = deps[i];
              if (wasTracked(dep) && !newTracked(dep)) {
                  dep.delete(effect);
              }
              else {
                  deps[ptr++] = dep;
              }
              // clear bits
              dep.w &= ~trackOpBit;
              dep.n &= ~trackOpBit;
          }
          deps.length = ptr;
      }
  };

  const targetMap = new WeakMap();
  // The number of effects currently being tracked recursively.
  let effectTrackDepth = 0;
  let trackOpBit = 1;
  /**
   * The bitwise track markers support at most 30 levels of recursion.
   * This value is chosen to enable modern JS engines to use a SMI on all platforms.
   * When recursion depth is greater, fall back to using a full cleanup.
   */
  const maxMarkerBits = 30;
  let activeEffect;
  const ITERATE_KEY = Symbol('iterate' );
  const MAP_KEY_ITERATE_KEY = Symbol('Map key iterate' );
  class ReactiveEffect {
      constructor(fn, scheduler = null, scope) {
          this.fn = fn;
          this.scheduler = scheduler;
          this.active = true;
          this.deps = [];
          this.parent = undefined;
          recordEffectScope(this, scope);
      }
      run() {
          if (!this.active) {
              return this.fn();
          }
          let parent = activeEffect;
          let lastShouldTrack = shouldTrack;
          while (parent) {
              if (parent === this) {
                  return;
              }
              parent = parent.parent;
          }
          try {
              this.parent = activeEffect;
              activeEffect = this;
              shouldTrack = true;
              trackOpBit = 1 << ++effectTrackDepth;
              if (effectTrackDepth <= maxMarkerBits) {
                  initDepMarkers(this);
              }
              else {
                  cleanupEffect(this);
              }
              return this.fn();
          }
          finally {
              if (effectTrackDepth <= maxMarkerBits) {
                  finalizeDepMarkers(this);
              }
              trackOpBit = 1 << --effectTrackDepth;
              activeEffect = this.parent;
              shouldTrack = lastShouldTrack;
              this.parent = undefined;
              if (this.deferStop) {
                  this.stop();
              }
          }
      }
      stop() {
          // stopped while running itself - defer the cleanup
          if (activeEffect === this) {
              this.deferStop = true;
          }
          else if (this.active) {
              cleanupEffect(this);
              if (this.onStop) {
                  this.onStop();
              }
              this.active = false;
          }
      }
  }
  function cleanupEffect(effect) {
      const { deps } = effect;
      if (deps.length) {
          for (let i = 0; i < deps.length; i++) {
              deps[i].delete(effect);
          }
          deps.length = 0;
      }
  }
  function effect(fn, options) {
      if (fn.effect) {
          fn = fn.effect.fn;
      }
      const _effect = new ReactiveEffect(fn);
      if (options) {
          extend(_effect, options);
          if (options.scope)
              recordEffectScope(_effect, options.scope);
      }
      if (!options || !options.lazy) {
          _effect.run();
      }
      const runner = _effect.run.bind(_effect);
      runner.effect = _effect;
      return runner;
  }
  function stop(runner) {
      runner.effect.stop();
  }
  let shouldTrack = true;
  const trackStack = [];
  function pauseTracking() {
      trackStack.push(shouldTrack);
      shouldTrack = false;
  }
  function enableTracking() {
      trackStack.push(shouldTrack);
      shouldTrack = true;
  }
  function resetTracking() {
      const last = trackStack.pop();
      shouldTrack = last === undefined ? true : last;
  }
  function track(target, type, key) {
      if (shouldTrack && activeEffect) {
          let depsMap = targetMap.get(target);
          if (!depsMap) {
              targetMap.set(target, (depsMap = new Map()));
          }
          let dep = depsMap.get(key);
          if (!dep) {
              depsMap.set(key, (dep = createDep()));
          }
          const eventInfo = { effect: activeEffect, target, type, key }
              ;
          trackEffects(dep, eventInfo);
      }
  }
  function trackEffects(dep, debuggerEventExtraInfo) {
      let shouldTrack = false;
      if (effectTrackDepth <= maxMarkerBits) {
          if (!newTracked(dep)) {
              dep.n |= trackOpBit; // set newly tracked
              shouldTrack = !wasTracked(dep);
          }
      }
      else {
          // Full cleanup mode.
          shouldTrack = !dep.has(activeEffect);
      }
      if (shouldTrack) {
          dep.add(activeEffect);
          activeEffect.deps.push(dep);
          if (activeEffect.onTrack) {
              activeEffect.onTrack(Object.assign({ effect: activeEffect }, debuggerEventExtraInfo));
          }
      }
  }
  function trigger(target, type, key, newValue, oldValue, oldTarget) {
      const depsMap = targetMap.get(target);
      if (!depsMap) {
          // never been tracked
          return;
      }
      let deps = [];
      if (type === "clear" /* TriggerOpTypes.CLEAR */) {
          // collection being cleared
          // trigger all effects for target
          deps = [...depsMap.values()];
      }
      else if (key === 'length' && isArray(target)) {
          const newLength = Number(newValue);
          depsMap.forEach((dep, key) => {
              if (key === 'length' || key >= newLength) {
                  deps.push(dep);
              }
          });
      }
      else {
          // schedule runs for SET | ADD | DELETE
          if (key !== void 0) {
              deps.push(depsMap.get(key));
          }
          // also run for iteration key on ADD | DELETE | Map.SET
          switch (type) {
              case "add" /* TriggerOpTypes.ADD */:
                  if (!isArray(target)) {
                      deps.push(depsMap.get(ITERATE_KEY));
                      if (isMap(target)) {
                          deps.push(depsMap.get(MAP_KEY_ITERATE_KEY));
                      }
                  }
                  else if (isIntegerKey(key)) {
                      // new index added to array -> length changes
                      deps.push(depsMap.get('length'));
                  }
                  break;
              case "delete" /* TriggerOpTypes.DELETE */:
                  if (!isArray(target)) {
                      deps.push(depsMap.get(ITERATE_KEY));
                      if (isMap(target)) {
                          deps.push(depsMap.get(MAP_KEY_ITERATE_KEY));
                      }
                  }
                  break;
              case "set" /* TriggerOpTypes.SET */:
                  if (isMap(target)) {
                      deps.push(depsMap.get(ITERATE_KEY));
                  }
                  break;
          }
      }
      const eventInfo = { target, type, key, newValue, oldValue, oldTarget }
          ;
      if (deps.length === 1) {
          if (deps[0]) {
              {
                  triggerEffects(deps[0], eventInfo);
              }
          }
      }
      else {
          const effects = [];
          for (const dep of deps) {
              if (dep) {
                  effects.push(...dep);
              }
          }
          {
              triggerEffects(createDep(effects), eventInfo);
          }
      }
  }
  function triggerEffects(dep, debuggerEventExtraInfo) {
      // spread into array for stabilization
      const effects = isArray(dep) ? dep : [...dep];
      for (const effect of effects) {
          if (effect.computed) {
              triggerEffect(effect, debuggerEventExtraInfo);
          }
      }
      for (const effect of effects) {
          if (!effect.computed) {
              triggerEffect(effect, debuggerEventExtraInfo);
          }
      }
  }
  function triggerEffect(effect, debuggerEventExtraInfo) {
      if (effect !== activeEffect || effect.allowRecurse) {
          if (effect.onTrigger) {
              effect.onTrigger(extend({ effect }, debuggerEventExtraInfo));
          }
          if (effect.scheduler) {
              effect.scheduler();
          }
          else {
              effect.run();
          }
      }
  }
  function getDepFromReactive(object, key) {
      var _a;
      return (_a = targetMap.get(object)) === null || _a === void 0 ? void 0 : _a.get(key);
  }

  const isNonTrackableKeys = /*#__PURE__*/ makeMap(`__proto__,__v_isRef,__isVue`);
  const builtInSymbols = new Set(
  /*#__PURE__*/
  Object.getOwnPropertyNames(Symbol)
      // ios10.x Object.getOwnPropertyNames(Symbol) can enumerate 'arguments' and 'caller'
      // but accessing them on Symbol leads to TypeError because Symbol is a strict mode
      // function
      .filter(key => key !== 'arguments' && key !== 'caller')
      .map(key => Symbol[key])
      .filter(isSymbol));
  const get$1 = /*#__PURE__*/ createGetter();
  const shallowGet = /*#__PURE__*/ createGetter(false, true);
  const readonlyGet = /*#__PURE__*/ createGetter(true);
  const shallowReadonlyGet = /*#__PURE__*/ createGetter(true, true);
  const arrayInstrumentations = /*#__PURE__*/ createArrayInstrumentations();
  function createArrayInstrumentations() {
      const instrumentations = {};
      ['includes', 'indexOf', 'lastIndexOf'].forEach(key => {
          instrumentations[key] = function (...args) {
              const arr = toRaw(this);
              for (let i = 0, l = this.length; i < l; i++) {
                  track(arr, "get" /* TrackOpTypes.GET */, i + '');
              }
              // we run the method using the original args first (which may be reactive)
              const res = arr[key](...args);
              if (res === -1 || res === false) {
                  // if that didn't work, run it again using raw values.
                  return arr[key](...args.map(toRaw));
              }
              else {
                  return res;
              }
          };
      });
      ['push', 'pop', 'shift', 'unshift', 'splice'].forEach(key => {
          instrumentations[key] = function (...args) {
              pauseTracking();
              const res = toRaw(this)[key].apply(this, args);
              resetTracking();
              return res;
          };
      });
      return instrumentations;
  }
  function hasOwnProperty(key) {
      const obj = toRaw(this);
      track(obj, "has" /* TrackOpTypes.HAS */, key);
      return obj.hasOwnProperty(key);
  }
  function createGetter(isReadonly = false, shallow = false) {
      return function get(target, key, receiver) {
          if (key === "__v_isReactive" /* ReactiveFlags.IS_REACTIVE */) {
              return !isReadonly;
          }
          else if (key === "__v_isReadonly" /* ReactiveFlags.IS_READONLY */) {
              return isReadonly;
          }
          else if (key === "__v_isShallow" /* ReactiveFlags.IS_SHALLOW */) {
              return shallow;
          }
          else if (key === "__v_raw" /* ReactiveFlags.RAW */ &&
              receiver ===
                  (isReadonly
                      ? shallow
                          ? shallowReadonlyMap
                          : readonlyMap
                      : shallow
                          ? shallowReactiveMap
                          : reactiveMap).get(target)) {
              return target;
          }
          const targetIsArray = isArray(target);
          if (!isReadonly) {
              if (targetIsArray && hasOwn(arrayInstrumentations, key)) {
                  return Reflect.get(arrayInstrumentations, key, receiver);
              }
              if (key === 'hasOwnProperty') {
                  return hasOwnProperty;
              }
          }
          const res = Reflect.get(target, key, receiver);
          if (isSymbol(key) ? builtInSymbols.has(key) : isNonTrackableKeys(key)) {
              return res;
          }
          if (!isReadonly) {
              track(target, "get" /* TrackOpTypes.GET */, key);
          }
          if (shallow) {
              return res;
          }
          if (isRef(res)) {
              // ref unwrapping - skip unwrap for Array + integer key.
              return targetIsArray && isIntegerKey(key) ? res : res.value;
          }
          if (isObject(res)) {
              // Convert returned value into a proxy as well. we do the isObject check
              // here to avoid invalid value warning. Also need to lazy access readonly
              // and reactive here to avoid circular dependency.
              return isReadonly ? readonly(res) : reactive(res);
          }
          return res;
      };
  }
  const set$1 = /*#__PURE__*/ createSetter();
  const shallowSet = /*#__PURE__*/ createSetter(true);
  function createSetter(shallow = false) {
      return function set(target, key, value, receiver) {
          let oldValue = target[key];
          if (isReadonly(oldValue) && isRef(oldValue) && !isRef(value)) {
              return false;
          }
          if (!shallow) {
              if (!isShallow(value) && !isReadonly(value)) {
                  oldValue = toRaw(oldValue);
                  value = toRaw(value);
              }
              if (!isArray(target) && isRef(oldValue) && !isRef(value)) {
                  oldValue.value = value;
                  return true;
              }
          }
          const hadKey = isArray(target) && isIntegerKey(key)
              ? Number(key) < target.length
              : hasOwn(target, key);
          const result = Reflect.set(target, key, value, receiver);
          // don't trigger if target is something up in the prototype chain of original
          if (target === toRaw(receiver)) {
              if (!hadKey) {
                  trigger(target, "add" /* TriggerOpTypes.ADD */, key, value);
              }
              else if (hasChanged(value, oldValue)) {
                  trigger(target, "set" /* TriggerOpTypes.SET */, key, value, oldValue);
              }
          }
          return result;
      };
  }
  function deleteProperty(target, key) {
      const hadKey = hasOwn(target, key);
      const oldValue = target[key];
      const result = Reflect.deleteProperty(target, key);
      if (result && hadKey) {
          trigger(target, "delete" /* TriggerOpTypes.DELETE */, key, undefined, oldValue);
      }
      return result;
  }
  function has$1(target, key) {
      const result = Reflect.has(target, key);
      if (!isSymbol(key) || !builtInSymbols.has(key)) {
          track(target, "has" /* TrackOpTypes.HAS */, key);
      }
      return result;
  }
  function ownKeys(target) {
      track(target, "iterate" /* TrackOpTypes.ITERATE */, isArray(target) ? 'length' : ITERATE_KEY);
      return Reflect.ownKeys(target);
  }
  const mutableHandlers = {
      get: get$1,
      set: set$1,
      deleteProperty,
      has: has$1,
      ownKeys
  };
  const readonlyHandlers = {
      get: readonlyGet,
      set(target, key) {
          {
              warn(`Set operation on key "${String(key)}" failed: target is readonly.`, target);
          }
          return true;
      },
      deleteProperty(target, key) {
          {
              warn(`Delete operation on key "${String(key)}" failed: target is readonly.`, target);
          }
          return true;
      }
  };
  const shallowReactiveHandlers = /*#__PURE__*/ extend({}, mutableHandlers, {
      get: shallowGet,
      set: shallowSet
  });
  // Props handlers are special in the sense that it should not unwrap top-level
  // refs (in order to allow refs to be explicitly passed down), but should
  // retain the reactivity of the normal readonly object.
  const shallowReadonlyHandlers = /*#__PURE__*/ extend({}, readonlyHandlers, {
      get: shallowReadonlyGet
  });

  const toShallow = (value) => value;
  const getProto = (v) => Reflect.getPrototypeOf(v);
  function get(target, key, isReadonly = false, isShallow = false) {
      // #1772: readonly(reactive(Map)) should return readonly + reactive version
      // of the value
      target = target["__v_raw" /* ReactiveFlags.RAW */];
      const rawTarget = toRaw(target);
      const rawKey = toRaw(key);
      if (!isReadonly) {
          if (key !== rawKey) {
              track(rawTarget, "get" /* TrackOpTypes.GET */, key);
          }
          track(rawTarget, "get" /* TrackOpTypes.GET */, rawKey);
      }
      const { has } = getProto(rawTarget);
      const wrap = isShallow ? toShallow : isReadonly ? toReadonly : toReactive;
      if (has.call(rawTarget, key)) {
          return wrap(target.get(key));
      }
      else if (has.call(rawTarget, rawKey)) {
          return wrap(target.get(rawKey));
      }
      else if (target !== rawTarget) {
          // #3602 readonly(reactive(Map))
          // ensure that the nested reactive `Map` can do tracking for itself
          target.get(key);
      }
  }
  function has(key, isReadonly = false) {
      const target = this["__v_raw" /* ReactiveFlags.RAW */];
      const rawTarget = toRaw(target);
      const rawKey = toRaw(key);
      if (!isReadonly) {
          if (key !== rawKey) {
              track(rawTarget, "has" /* TrackOpTypes.HAS */, key);
          }
          track(rawTarget, "has" /* TrackOpTypes.HAS */, rawKey);
      }
      return key === rawKey
          ? target.has(key)
          : target.has(key) || target.has(rawKey);
  }
  function size(target, isReadonly = false) {
      target = target["__v_raw" /* ReactiveFlags.RAW */];
      !isReadonly && track(toRaw(target), "iterate" /* TrackOpTypes.ITERATE */, ITERATE_KEY);
      return Reflect.get(target, 'size', target);
  }
  function add(value) {
      value = toRaw(value);
      const target = toRaw(this);
      const proto = getProto(target);
      const hadKey = proto.has.call(target, value);
      if (!hadKey) {
          target.add(value);
          trigger(target, "add" /* TriggerOpTypes.ADD */, value, value);
      }
      return this;
  }
  function set(key, value) {
      value = toRaw(value);
      const target = toRaw(this);
      const { has, get } = getProto(target);
      let hadKey = has.call(target, key);
      if (!hadKey) {
          key = toRaw(key);
          hadKey = has.call(target, key);
      }
      else {
          checkIdentityKeys(target, has, key);
      }
      const oldValue = get.call(target, key);
      target.set(key, value);
      if (!hadKey) {
          trigger(target, "add" /* TriggerOpTypes.ADD */, key, value);
      }
      else if (hasChanged(value, oldValue)) {
          trigger(target, "set" /* TriggerOpTypes.SET */, key, value, oldValue);
      }
      return this;
  }
  function deleteEntry(key) {
      const target = toRaw(this);
      const { has, get } = getProto(target);
      let hadKey = has.call(target, key);
      if (!hadKey) {
          key = toRaw(key);
          hadKey = has.call(target, key);
      }
      else {
          checkIdentityKeys(target, has, key);
      }
      const oldValue = get ? get.call(target, key) : undefined;
      // forward the operation before queueing reactions
      const result = target.delete(key);
      if (hadKey) {
          trigger(target, "delete" /* TriggerOpTypes.DELETE */, key, undefined, oldValue);
      }
      return result;
  }
  function clear() {
      const target = toRaw(this);
      const hadItems = target.size !== 0;
      const oldTarget = isMap(target)
              ? new Map(target)
              : new Set(target)
          ;
      // forward the operation before queueing reactions
      const result = target.clear();
      if (hadItems) {
          trigger(target, "clear" /* TriggerOpTypes.CLEAR */, undefined, undefined, oldTarget);
      }
      return result;
  }
  function createForEach(isReadonly, isShallow) {
      return function forEach(callback, thisArg) {
          const observed = this;
          const target = observed["__v_raw" /* ReactiveFlags.RAW */];
          const rawTarget = toRaw(target);
          const wrap = isShallow ? toShallow : isReadonly ? toReadonly : toReactive;
          !isReadonly && track(rawTarget, "iterate" /* TrackOpTypes.ITERATE */, ITERATE_KEY);
          return target.forEach((value, key) => {
              // important: make sure the callback is
              // 1. invoked with the reactive map as `this` and 3rd arg
              // 2. the value received should be a corresponding reactive/readonly.
              return callback.call(thisArg, wrap(value), wrap(key), observed);
          });
      };
  }
  function createIterableMethod(method, isReadonly, isShallow) {
      return function (...args) {
          const target = this["__v_raw" /* ReactiveFlags.RAW */];
          const rawTarget = toRaw(target);
          const targetIsMap = isMap(rawTarget);
          const isPair = method === 'entries' || (method === Symbol.iterator && targetIsMap);
          const isKeyOnly = method === 'keys' && targetIsMap;
          const innerIterator = target[method](...args);
          const wrap = isShallow ? toShallow : isReadonly ? toReadonly : toReactive;
          !isReadonly &&
              track(rawTarget, "iterate" /* TrackOpTypes.ITERATE */, isKeyOnly ? MAP_KEY_ITERATE_KEY : ITERATE_KEY);
          // return a wrapped iterator which returns observed versions of the
          // values emitted from the real iterator
          return {
              // iterator protocol
              next() {
                  const { value, done } = innerIterator.next();
                  return done
                      ? { value, done }
                      : {
                          value: isPair ? [wrap(value[0]), wrap(value[1])] : wrap(value),
                          done
                      };
              },
              // iterable protocol
              [Symbol.iterator]() {
                  return this;
              }
          };
      };
  }
  function createReadonlyMethod(type) {
      return function (...args) {
          {
              const key = args[0] ? `on key "${args[0]}" ` : ``;
              console.warn(`${capitalize(type)} operation ${key}failed: target is readonly.`, toRaw(this));
          }
          return type === "delete" /* TriggerOpTypes.DELETE */ ? false : this;
      };
  }
  function createInstrumentations() {
      const mutableInstrumentations = {
          get(key) {
              return get(this, key);
          },
          get size() {
              return size(this);
          },
          has,
          add,
          set,
          delete: deleteEntry,
          clear,
          forEach: createForEach(false, false)
      };
      const shallowInstrumentations = {
          get(key) {
              return get(this, key, false, true);
          },
          get size() {
              return size(this);
          },
          has,
          add,
          set,
          delete: deleteEntry,
          clear,
          forEach: createForEach(false, true)
      };
      const readonlyInstrumentations = {
          get(key) {
              return get(this, key, true);
          },
          get size() {
              return size(this, true);
          },
          has(key) {
              return has.call(this, key, true);
          },
          add: createReadonlyMethod("add" /* TriggerOpTypes.ADD */),
          set: createReadonlyMethod("set" /* TriggerOpTypes.SET */),
          delete: createReadonlyMethod("delete" /* TriggerOpTypes.DELETE */),
          clear: createReadonlyMethod("clear" /* TriggerOpTypes.CLEAR */),
          forEach: createForEach(true, false)
      };
      const shallowReadonlyInstrumentations = {
          get(key) {
              return get(this, key, true, true);
          },
          get size() {
              return size(this, true);
          },
          has(key) {
              return has.call(this, key, true);
          },
          add: createReadonlyMethod("add" /* TriggerOpTypes.ADD */),
          set: createReadonlyMethod("set" /* TriggerOpTypes.SET */),
          delete: createReadonlyMethod("delete" /* TriggerOpTypes.DELETE */),
          clear: createReadonlyMethod("clear" /* TriggerOpTypes.CLEAR */),
          forEach: createForEach(true, true)
      };
      const iteratorMethods = ['keys', 'values', 'entries', Symbol.iterator];
      iteratorMethods.forEach(method => {
          mutableInstrumentations[method] = createIterableMethod(method, false, false);
          readonlyInstrumentations[method] = createIterableMethod(method, true, false);
          shallowInstrumentations[method] = createIterableMethod(method, false, true);
          shallowReadonlyInstrumentations[method] = createIterableMethod(method, true, true);
      });
      return [
          mutableInstrumentations,
          readonlyInstrumentations,
          shallowInstrumentations,
          shallowReadonlyInstrumentations
      ];
  }
  const [mutableInstrumentations, readonlyInstrumentations, shallowInstrumentations, shallowReadonlyInstrumentations] = /* #__PURE__*/ createInstrumentations();
  function createInstrumentationGetter(isReadonly, shallow) {
      const instrumentations = shallow
          ? isReadonly
              ? shallowReadonlyInstrumentations
              : shallowInstrumentations
          : isReadonly
              ? readonlyInstrumentations
              : mutableInstrumentations;
      return (target, key, receiver) => {
          if (key === "__v_isReactive" /* ReactiveFlags.IS_REACTIVE */) {
              return !isReadonly;
          }
          else if (key === "__v_isReadonly" /* ReactiveFlags.IS_READONLY */) {
              return isReadonly;
          }
          else if (key === "__v_raw" /* ReactiveFlags.RAW */) {
              return target;
          }
          return Reflect.get(hasOwn(instrumentations, key) && key in target
              ? instrumentations
              : target, key, receiver);
      };
  }
  const mutableCollectionHandlers = {
      get: /*#__PURE__*/ createInstrumentationGetter(false, false)
  };
  const shallowCollectionHandlers = {
      get: /*#__PURE__*/ createInstrumentationGetter(false, true)
  };
  const readonlyCollectionHandlers = {
      get: /*#__PURE__*/ createInstrumentationGetter(true, false)
  };
  const shallowReadonlyCollectionHandlers = {
      get: /*#__PURE__*/ createInstrumentationGetter(true, true)
  };
  function checkIdentityKeys(target, has, key) {
      const rawKey = toRaw(key);
      if (rawKey !== key && has.call(target, rawKey)) {
          const type = toRawType(target);
          console.warn(`Reactive ${type} contains both the raw and reactive ` +
              `versions of the same object${type === `Map` ? ` as keys` : ``}, ` +
              `which can lead to inconsistencies. ` +
              `Avoid differentiating between the raw and reactive versions ` +
              `of an object and only use the reactive version if possible.`);
      }
  }

  const reactiveMap = new WeakMap();
  const shallowReactiveMap = new WeakMap();
  const readonlyMap = new WeakMap();
  const shallowReadonlyMap = new WeakMap();
  function targetTypeMap(rawType) {
      switch (rawType) {
          case 'Object':
          case 'Array':
              return 1 /* TargetType.COMMON */;
          case 'Map':
          case 'Set':
          case 'WeakMap':
          case 'WeakSet':
              return 2 /* TargetType.COLLECTION */;
          default:
              return 0 /* TargetType.INVALID */;
      }
  }
  function getTargetType(value) {
      return value["__v_skip" /* ReactiveFlags.SKIP */] || !Object.isExtensible(value)
          ? 0 /* TargetType.INVALID */
          : targetTypeMap(toRawType(value));
  }
  function reactive(target) {
      // if trying to observe a readonly proxy, return the readonly version.
      if (isReadonly(target)) {
          return target;
      }
      return createReactiveObject(target, false, mutableHandlers, mutableCollectionHandlers, reactiveMap);
  }
  /**
   * Return a shallowly-reactive copy of the original object, where only the root
   * level properties are reactive. It also does not auto-unwrap refs (even at the
   * root level).
   */
  function shallowReactive(target) {
      return createReactiveObject(target, false, shallowReactiveHandlers, shallowCollectionHandlers, shallowReactiveMap);
  }
  /**
   * Creates a readonly copy of the original object. Note the returned copy is not
   * made reactive, but `readonly` can be called on an already reactive object.
   */
  function readonly(target) {
      return createReactiveObject(target, true, readonlyHandlers, readonlyCollectionHandlers, readonlyMap);
  }
  /**
   * Returns a reactive-copy of the original object, where only the root level
   * properties are readonly, and does NOT unwrap refs nor recursively convert
   * returned properties.
   * This is used for creating the props proxy object for stateful components.
   */
  function shallowReadonly(target) {
      return createReactiveObject(target, true, shallowReadonlyHandlers, shallowReadonlyCollectionHandlers, shallowReadonlyMap);
  }
  function createReactiveObject(target, isReadonly, baseHandlers, collectionHandlers, proxyMap) {
      if (!isObject(target)) {
          {
              console.warn(`value cannot be made reactive: ${String(target)}`);
          }
          return target;
      }
      // target is already a Proxy, return it.
      // exception: calling readonly() on a reactive object
      if (target["__v_raw" /* ReactiveFlags.RAW */] &&
          !(isReadonly && target["__v_isReactive" /* ReactiveFlags.IS_REACTIVE */])) {
          return target;
      }
      // target already has corresponding Proxy
      const existingProxy = proxyMap.get(target);
      if (existingProxy) {
          return existingProxy;
      }
      // only specific value types can be observed.
      const targetType = getTargetType(target);
      if (targetType === 0 /* TargetType.INVALID */) {
          return target;
      }
      const proxy = new Proxy(target, targetType === 2 /* TargetType.COLLECTION */ ? collectionHandlers : baseHandlers);
      proxyMap.set(target, proxy);
      return proxy;
  }
  function isReactive(value) {
      if (isReadonly(value)) {
          return isReactive(value["__v_raw" /* ReactiveFlags.RAW */]);
      }
      return !!(value && value["__v_isReactive" /* ReactiveFlags.IS_REACTIVE */]);
  }
  function isReadonly(value) {
      return !!(value && value["__v_isReadonly" /* ReactiveFlags.IS_READONLY */]);
  }
  function isShallow(value) {
      return !!(value && value["__v_isShallow" /* ReactiveFlags.IS_SHALLOW */]);
  }
  function isProxy(value) {
      return isReactive(value) || isReadonly(value);
  }
  function toRaw(observed) {
      const raw = observed && observed["__v_raw" /* ReactiveFlags.RAW */];
      return raw ? toRaw(raw) : observed;
  }
  function markRaw(value) {
      def(value, "__v_skip" /* ReactiveFlags.SKIP */, true);
      return value;
  }
  const toReactive = (value) => isObject(value) ? reactive(value) : value;
  const toReadonly = (value) => isObject(value) ? readonly(value) : value;

  function trackRefValue(ref) {
      if (shouldTrack && activeEffect) {
          ref = toRaw(ref);
          {
              trackEffects(ref.dep || (ref.dep = createDep()), {
                  target: ref,
                  type: "get" /* TrackOpTypes.GET */,
                  key: 'value'
              });
          }
      }
  }
  function triggerRefValue(ref, newVal) {
      ref = toRaw(ref);
      const dep = ref.dep;
      if (dep) {
          {
              triggerEffects(dep, {
                  target: ref,
                  type: "set" /* TriggerOpTypes.SET */,
                  key: 'value',
                  newValue: newVal
              });
          }
      }
  }
  function isRef(r) {
      return !!(r && r.__v_isRef === true);
  }
  function ref(value) {
      return createRef(value, false);
  }
  function shallowRef(value) {
      return createRef(value, true);
  }
  function createRef(rawValue, shallow) {
      if (isRef(rawValue)) {
          return rawValue;
      }
      return new RefImpl(rawValue, shallow);
  }
  class RefImpl {
      constructor(value, __v_isShallow) {
          this.__v_isShallow = __v_isShallow;
          this.dep = undefined;
          this.__v_isRef = true;
          this._rawValue = __v_isShallow ? value : toRaw(value);
          this._value = __v_isShallow ? value : toReactive(value);
      }
      get value() {
          trackRefValue(this);
          return this._value;
      }
      set value(newVal) {
          const useDirectValue = this.__v_isShallow || isShallow(newVal) || isReadonly(newVal);
          newVal = useDirectValue ? newVal : toRaw(newVal);
          if (hasChanged(newVal, this._rawValue)) {
              this._rawValue = newVal;
              this._value = useDirectValue ? newVal : toReactive(newVal);
              triggerRefValue(this, newVal);
          }
      }
  }
  function triggerRef(ref) {
      triggerRefValue(ref, ref.value );
  }
  function unref(ref) {
      return isRef(ref) ? ref.value : ref;
  }
  const shallowUnwrapHandlers = {
      get: (target, key, receiver) => unref(Reflect.get(target, key, receiver)),
      set: (target, key, value, receiver) => {
          const oldValue = target[key];
          if (isRef(oldValue) && !isRef(value)) {
              oldValue.value = value;
              return true;
          }
          else {
              return Reflect.set(target, key, value, receiver);
          }
      }
  };
  function proxyRefs(objectWithRefs) {
      return isReactive(objectWithRefs)
          ? objectWithRefs
          : new Proxy(objectWithRefs, shallowUnwrapHandlers);
  }
  class CustomRefImpl {
      constructor(factory) {
          this.dep = undefined;
          this.__v_isRef = true;
          const { get, set } = factory(() => trackRefValue(this), () => triggerRefValue(this));
          this._get = get;
          this._set = set;
      }
      get value() {
          return this._get();
      }
      set value(newVal) {
          this._set(newVal);
      }
  }
  function customRef(factory) {
      return new CustomRefImpl(factory);
  }
  function toRefs(object) {
      if (!isProxy(object)) {
          console.warn(`toRefs() expects a reactive object but received a plain one.`);
      }
      const ret = isArray(object) ? new Array(object.length) : {};
      for (const key in object) {
          ret[key] = toRef(object, key);
      }
      return ret;
  }
  class ObjectRefImpl {
      constructor(_object, _key, _defaultValue) {
          this._object = _object;
          this._key = _key;
          this._defaultValue = _defaultValue;
          this.__v_isRef = true;
      }
      get value() {
          const val = this._object[this._key];
          return val === undefined ? this._defaultValue : val;
      }
      set value(newVal) {
          this._object[this._key] = newVal;
      }
      get dep() {
          return getDepFromReactive(toRaw(this._object), this._key);
      }
  }
  function toRef(object, key, defaultValue) {
      const val = object[key];
      return isRef(val)
          ? val
          : new ObjectRefImpl(object, key, defaultValue);
  }

  var _a$1;
  class ComputedRefImpl {
      constructor(getter, _setter, isReadonly, isSSR) {
          this._setter = _setter;
          this.dep = undefined;
          this.__v_isRef = true;
          this[_a$1] = false;
          this._dirty = true;
          this.effect = new ReactiveEffect(getter, () => {
              if (!this._dirty) {
                  this._dirty = true;
                  triggerRefValue(this);
              }
          });
          this.effect.computed = this;
          this.effect.active = this._cacheable = !isSSR;
          this["__v_isReadonly" /* ReactiveFlags.IS_READONLY */] = isReadonly;
      }
      get value() {
          // the computed ref may get wrapped by other proxies e.g. readonly() #3376
          const self = toRaw(this);
          trackRefValue(self);
          if (self._dirty || !self._cacheable) {
              self._dirty = false;
              self._value = self.effect.run();
          }
          return self._value;
      }
      set value(newValue) {
          this._setter(newValue);
      }
  }
  _a$1 = "__v_isReadonly" /* ReactiveFlags.IS_READONLY */;
  function computed(getterOrOptions, debugOptions, isSSR = false) {
      let getter;
      let setter;
      const onlyGetter = isFunction(getterOrOptions);
      if (onlyGetter) {
          getter = getterOrOptions;
          setter = () => {
                  console.warn('Write operation failed: computed value is readonly');
              }
              ;
      }
      else {
          getter = getterOrOptions.get;
          setter = getterOrOptions.set;
      }
      const cRef = new ComputedRefImpl(getter, setter, onlyGetter || !setter, isSSR);
      if (debugOptions && !isSSR) {
          cRef.effect.onTrack = debugOptions.onTrack;
          cRef.effect.onTrigger = debugOptions.onTrigger;
      }
      return cRef;
  }

  var _a;
  const tick = /*#__PURE__*/ Promise.resolve();
  const queue = [];
  let queued = false;
  const scheduler = (fn) => {
      queue.push(fn);
      if (!queued) {
          queued = true;
          tick.then(flush);
      }
  };
  const flush = () => {
      for (let i = 0; i < queue.length; i++) {
          queue[i]();
      }
      queue.length = 0;
      queued = false;
  };
  class DeferredComputedRefImpl {
      constructor(getter) {
          this.dep = undefined;
          this._dirty = true;
          this.__v_isRef = true;
          this[_a] = true;
          let compareTarget;
          let hasCompareTarget = false;
          let scheduled = false;
          this.effect = new ReactiveEffect(getter, (computedTrigger) => {
              if (this.dep) {
                  if (computedTrigger) {
                      compareTarget = this._value;
                      hasCompareTarget = true;
                  }
                  else if (!scheduled) {
                      const valueToCompare = hasCompareTarget ? compareTarget : this._value;
                      scheduled = true;
                      hasCompareTarget = false;
                      scheduler(() => {
                          if (this.effect.active && this._get() !== valueToCompare) {
                              triggerRefValue(this);
                          }
                          scheduled = false;
                      });
                  }
                  // chained upstream computeds are notified synchronously to ensure
                  // value invalidation in case of sync access; normal effects are
                  // deferred to be triggered in scheduler.
                  for (const e of this.dep) {
                      if (e.computed instanceof DeferredComputedRefImpl) {
                          e.scheduler(true /* computedTrigger */);
                      }
                  }
              }
              this._dirty = true;
          });
          this.effect.computed = this;
      }
      _get() {
          if (this._dirty) {
              this._dirty = false;
              return (this._value = this.effect.run());
          }
          return this._value;
      }
      get value() {
          trackRefValue(this);
          // the computed ref may get wrapped by other proxies e.g. readonly() #3376
          return toRaw(this)._get();
      }
  }
  _a = "__v_isReadonly" /* ReactiveFlags.IS_READONLY */;
  function deferredComputed(getter) {
      return new DeferredComputedRefImpl(getter);
  }

  exports.EffectScope = EffectScope;
  exports.ITERATE_KEY = ITERATE_KEY;
  exports.ReactiveEffect = ReactiveEffect;
  exports.computed = computed;
  exports.customRef = customRef;
  exports.deferredComputed = deferredComputed;
  exports.effect = effect;
  exports.effectScope = effectScope;
  exports.enableTracking = enableTracking;
  exports.getCurrentScope = getCurrentScope;
  exports.isProxy = isProxy;
  exports.isReactive = isReactive;
  exports.isReadonly = isReadonly;
  exports.isRef = isRef;
  exports.isShallow = isShallow;
  exports.markRaw = markRaw;
  exports.onScopeDispose = onScopeDispose;
  exports.pauseTracking = pauseTracking;
  exports.proxyRefs = proxyRefs;
  exports.reactive = reactive;
  exports.readonly = readonly;
  exports.ref = ref;
  exports.resetTracking = resetTracking;
  exports.shallowReactive = shallowReactive;
  exports.shallowReadonly = shallowReadonly;
  exports.shallowRef = shallowRef;
  exports.stop = stop;
  exports.toRaw = toRaw;
  exports.toRef = toRef;
  exports.toRefs = toRefs;
  exports.track = track;
  exports.trigger = trigger;
  exports.triggerRef = triggerRef;
  exports.unref = unref;

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

  return exports;

})({});