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name : 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 EMPTY_OBJ = Object.freeze({})
      ;
  Object.freeze([]) ;
  const extend = Object.assign;
  const hasOwnProperty = Object.prototype.hasOwnProperty;
  const hasOwn = (val, key) => hasOwnProperty.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) => value !== oldValue && (value === value || oldValue === oldValue);
  const def = (obj, key, value) => {
      Object.defineProperty(obj, key, {
          configurable: true,
          enumerable: false,
          value
      });
  };

  const targetMap = new WeakMap();
  const effectStack = [];
  let activeEffect;
  const ITERATE_KEY = Symbol('iterate' );
  const MAP_KEY_ITERATE_KEY = Symbol('Map key iterate' );
  function isEffect(fn) {
      return fn && fn._isEffect === true;
  }
  function effect(fn, options = EMPTY_OBJ) {
      if (isEffect(fn)) {
          fn = fn.raw;
      }
      const effect = createReactiveEffect(fn, options);
      if (!options.lazy) {
          effect();
      }
      return effect;
  }
  function stop(effect) {
      if (effect.active) {
          cleanup(effect);
          if (effect.options.onStop) {
              effect.options.onStop();
          }
          effect.active = false;
      }
  }
  let uid = 0;
  function createReactiveEffect(fn, options) {
      const effect = function reactiveEffect() {
          if (!effect.active) {
              return fn();
          }
          if (!effectStack.includes(effect)) {
              cleanup(effect);
              try {
                  enableTracking();
                  effectStack.push(effect);
                  activeEffect = effect;
                  return fn();
              }
              finally {
                  effectStack.pop();
                  resetTracking();
                  activeEffect = effectStack[effectStack.length - 1];
              }
          }
      };
      effect.id = uid++;
      effect.allowRecurse = !!options.allowRecurse;
      effect._isEffect = true;
      effect.active = true;
      effect.raw = fn;
      effect.deps = [];
      effect.options = options;
      return effect;
  }
  function cleanup(effect) {
      const { deps } = effect;
      if (deps.length) {
          for (let i = 0; i < deps.length; i++) {
              deps[i].delete(effect);
          }
          deps.length = 0;
      }
  }
  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 === undefined) {
          return;
      }
      let depsMap = targetMap.get(target);
      if (!depsMap) {
          targetMap.set(target, (depsMap = new Map()));
      }
      let dep = depsMap.get(key);
      if (!dep) {
          depsMap.set(key, (dep = new Set()));
      }
      if (!dep.has(activeEffect)) {
          dep.add(activeEffect);
          activeEffect.deps.push(dep);
          if (activeEffect.options.onTrack) {
              activeEffect.options.onTrack({
                  effect: activeEffect,
                  target,
                  type,
                  key
              });
          }
      }
  }
  function trigger(target, type, key, newValue, oldValue, oldTarget) {
      const depsMap = targetMap.get(target);
      if (!depsMap) {
          // never been tracked
          return;
      }
      const effects = new Set();
      const add = (effectsToAdd) => {
          if (effectsToAdd) {
              effectsToAdd.forEach(effect => {
                  if (effect !== activeEffect || effect.allowRecurse) {
                      effects.add(effect);
                  }
              });
          }
      };
      if (type === "clear" /* CLEAR */) {
          // collection being cleared
          // trigger all effects for target
          depsMap.forEach(add);
      }
      else if (key === 'length' && isArray(target)) {
          depsMap.forEach((dep, key) => {
              if (key === 'length' || key >= newValue) {
                  add(dep);
              }
          });
      }
      else {
          // schedule runs for SET | ADD | DELETE
          if (key !== void 0) {
              add(depsMap.get(key));
          }
          // also run for iteration key on ADD | DELETE | Map.SET
          switch (type) {
              case "add" /* ADD */:
                  if (!isArray(target)) {
                      add(depsMap.get(ITERATE_KEY));
                      if (isMap(target)) {
                          add(depsMap.get(MAP_KEY_ITERATE_KEY));
                      }
                  }
                  else if (isIntegerKey(key)) {
                      // new index added to array -> length changes
                      add(depsMap.get('length'));
                  }
                  break;
              case "delete" /* DELETE */:
                  if (!isArray(target)) {
                      add(depsMap.get(ITERATE_KEY));
                      if (isMap(target)) {
                          add(depsMap.get(MAP_KEY_ITERATE_KEY));
                      }
                  }
                  break;
              case "set" /* SET */:
                  if (isMap(target)) {
                      add(depsMap.get(ITERATE_KEY));
                  }
                  break;
          }
      }
      const run = (effect) => {
          if (effect.options.onTrigger) {
              effect.options.onTrigger({
                  effect,
                  target,
                  key,
                  type,
                  newValue,
                  oldValue,
                  oldTarget
              });
          }
          if (effect.options.scheduler) {
              effect.options.scheduler(effect);
          }
          else {
              effect();
          }
      };
      effects.forEach(run);
  }

  const isNonTrackableKeys = /*#__PURE__*/ makeMap(`__proto__,__v_isRef,__isVue`);
  const builtInSymbols = new Set(Object.getOwnPropertyNames(Symbol)
      .map(key => Symbol[key])
      .filter(isSymbol));
  const get = /*#__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" /* 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 createGetter(isReadonly = false, shallow = false) {
      return function get(target, key, receiver) {
          if (key === "__v_isReactive" /* IS_REACTIVE */) {
              return !isReadonly;
          }
          else if (key === "__v_isReadonly" /* IS_READONLY */) {
              return isReadonly;
          }
          else if (key === "__v_raw" /* RAW */ &&
              receiver ===
                  (isReadonly
                      ? shallow
                          ? shallowReadonlyMap
                          : readonlyMap
                      : shallow
                          ? shallowReactiveMap
                          : reactiveMap).get(target)) {
              return target;
          }
          const targetIsArray = isArray(target);
          if (!isReadonly && targetIsArray && hasOwn(arrayInstrumentations, key)) {
              return Reflect.get(arrayInstrumentations, key, receiver);
          }
          const res = Reflect.get(target, key, receiver);
          if (isSymbol(key) ? builtInSymbols.has(key) : isNonTrackableKeys(key)) {
              return res;
          }
          if (!isReadonly) {
              track(target, "get" /* GET */, key);
          }
          if (shallow) {
              return res;
          }
          if (isRef(res)) {
              // ref unwrapping - does not apply for Array + integer key.
              const shouldUnwrap = !targetIsArray || !isIntegerKey(key);
              return shouldUnwrap ? res.value : res;
          }
          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 = /*#__PURE__*/ createSetter();
  const shallowSet = /*#__PURE__*/ createSetter(true);
  function createSetter(shallow = false) {
      return function set(target, key, value, receiver) {
          let oldValue = target[key];
          if (!shallow) {
              value = toRaw(value);
              oldValue = toRaw(oldValue);
              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" /* ADD */, key, value);
              }
              else if (hasChanged(value, oldValue)) {
                  trigger(target, "set" /* 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" /* DELETE */, key, undefined, oldValue);
      }
      return result;
  }
  function has(target, key) {
      const result = Reflect.has(target, key);
      if (!isSymbol(key) || !builtInSymbols.has(key)) {
          track(target, "has" /* HAS */, key);
      }
      return result;
  }
  function ownKeys(target) {
      track(target, "iterate" /* ITERATE */, isArray(target) ? 'length' : ITERATE_KEY);
      return Reflect.ownKeys(target);
  }
  const mutableHandlers = {
      get,
      set,
      deleteProperty,
      has,
      ownKeys
  };
  const readonlyHandlers = {
      get: readonlyGet,
      set(target, key) {
          {
              console.warn(`Set operation on key "${String(key)}" failed: target is readonly.`, target);
          }
          return true;
      },
      deleteProperty(target, key) {
          {
              console.warn(`Delete operation on key "${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 toReactive = (value) => isObject(value) ? reactive(value) : value;
  const toReadonly = (value) => isObject(value) ? readonly(value) : value;
  const toShallow = (value) => value;
  const getProto = (v) => Reflect.getPrototypeOf(v);
  function get$1(target, key, isReadonly = false, isShallow = false) {
      // #1772: readonly(reactive(Map)) should return readonly + reactive version
      // of the value
      target = target["__v_raw" /* RAW */];
      const rawTarget = toRaw(target);
      const rawKey = toRaw(key);
      if (key !== rawKey) {
          !isReadonly && track(rawTarget, "get" /* GET */, key);
      }
      !isReadonly && track(rawTarget, "get" /* 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$1(key, isReadonly = false) {
      const target = this["__v_raw" /* RAW */];
      const rawTarget = toRaw(target);
      const rawKey = toRaw(key);
      if (key !== rawKey) {
          !isReadonly && track(rawTarget, "has" /* HAS */, key);
      }
      !isReadonly && track(rawTarget, "has" /* HAS */, rawKey);
      return key === rawKey
          ? target.has(key)
          : target.has(key) || target.has(rawKey);
  }
  function size(target, isReadonly = false) {
      target = target["__v_raw" /* RAW */];
      !isReadonly && track(toRaw(target), "iterate" /* 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" /* ADD */, value, value);
      }
      return this;
  }
  function set$1(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" /* ADD */, key, value);
      }
      else if (hasChanged(value, oldValue)) {
          trigger(target, "set" /* 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" /* 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" /* CLEAR */, undefined, undefined, oldTarget);
      }
      return result;
  }
  function createForEach(isReadonly, isShallow) {
      return function forEach(callback, thisArg) {
          const observed = this;
          const target = observed["__v_raw" /* RAW */];
          const rawTarget = toRaw(target);
          const wrap = isShallow ? toShallow : isReadonly ? toReadonly : toReactive;
          !isReadonly && track(rawTarget, "iterate" /* 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" /* 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" /* 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" /* DELETE */ ? false : this;
      };
  }
  function createInstrumentations() {
      const mutableInstrumentations = {
          get(key) {
              return get$1(this, key);
          },
          get size() {
              return size(this);
          },
          has: has$1,
          add,
          set: set$1,
          delete: deleteEntry,
          clear,
          forEach: createForEach(false, false)
      };
      const shallowInstrumentations = {
          get(key) {
              return get$1(this, key, false, true);
          },
          get size() {
              return size(this);
          },
          has: has$1,
          add,
          set: set$1,
          delete: deleteEntry,
          clear,
          forEach: createForEach(false, true)
      };
      const readonlyInstrumentations = {
          get(key) {
              return get$1(this, key, true);
          },
          get size() {
              return size(this, true);
          },
          has(key) {
              return has$1.call(this, key, true);
          },
          add: createReadonlyMethod("add" /* ADD */),
          set: createReadonlyMethod("set" /* SET */),
          delete: createReadonlyMethod("delete" /* DELETE */),
          clear: createReadonlyMethod("clear" /* CLEAR */),
          forEach: createForEach(true, false)
      };
      const shallowReadonlyInstrumentations = {
          get(key) {
              return get$1(this, key, true, true);
          },
          get size() {
              return size(this, true);
          },
          has(key) {
              return has$1.call(this, key, true);
          },
          add: createReadonlyMethod("add" /* ADD */),
          set: createReadonlyMethod("set" /* SET */),
          delete: createReadonlyMethod("delete" /* DELETE */),
          clear: createReadonlyMethod("clear" /* 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" /* IS_REACTIVE */) {
              return !isReadonly;
          }
          else if (key === "__v_isReadonly" /* IS_READONLY */) {
              return isReadonly;
          }
          else if (key === "__v_raw" /* 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 /* COMMON */;
          case 'Map':
          case 'Set':
          case 'WeakMap':
          case 'WeakSet':
              return 2 /* COLLECTION */;
          default:
              return 0 /* INVALID */;
      }
  }
  function getTargetType(value) {
      return value["__v_skip" /* SKIP */] || !Object.isExtensible(value)
          ? 0 /* INVALID */
          : targetTypeMap(toRawType(value));
  }
  function reactive(target) {
      // if trying to observe a readonly proxy, return the readonly version.
      if (target && target["__v_isReadonly" /* IS_READONLY */]) {
          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" /* RAW */] &&
          !(isReadonly && target["__v_isReactive" /* IS_REACTIVE */])) {
          return target;
      }
      // target already has corresponding Proxy
      const existingProxy = proxyMap.get(target);
      if (existingProxy) {
          return existingProxy;
      }
      // only a whitelist of value types can be observed.
      const targetType = getTargetType(target);
      if (targetType === 0 /* INVALID */) {
          return target;
      }
      const proxy = new Proxy(target, targetType === 2 /* COLLECTION */ ? collectionHandlers : baseHandlers);
      proxyMap.set(target, proxy);
      return proxy;
  }
  function isReactive(value) {
      if (isReadonly(value)) {
          return isReactive(value["__v_raw" /* RAW */]);
      }
      return !!(value && value["__v_isReactive" /* IS_REACTIVE */]);
  }
  function isReadonly(value) {
      return !!(value && value["__v_isReadonly" /* IS_READONLY */]);
  }
  function isProxy(value) {
      return isReactive(value) || isReadonly(value);
  }
  function toRaw(observed) {
      return ((observed && toRaw(observed["__v_raw" /* RAW */])) || observed);
  }
  function markRaw(value) {
      def(value, "__v_skip" /* SKIP */, true);
      return value;
  }

  const convert = (val) => isObject(val) ? reactive(val) : val;
  function isRef(r) {
      return Boolean(r && r.__v_isRef === true);
  }
  function ref(value) {
      return createRef(value);
  }
  function shallowRef(value) {
      return createRef(value, true);
  }
  class RefImpl {
      constructor(value, _shallow = false) {
          this._shallow = _shallow;
          this.__v_isRef = true;
          this._rawValue = _shallow ? value : toRaw(value);
          this._value = _shallow ? value : convert(value);
      }
      get value() {
          track(toRaw(this), "get" /* GET */, 'value');
          return this._value;
      }
      set value(newVal) {
          newVal = this._shallow ? newVal : toRaw(newVal);
          if (hasChanged(newVal, this._rawValue)) {
              this._rawValue = newVal;
              this._value = this._shallow ? newVal : convert(newVal);
              trigger(toRaw(this), "set" /* SET */, 'value', newVal);
          }
      }
  }
  function createRef(rawValue, shallow = false) {
      if (isRef(rawValue)) {
          return rawValue;
      }
      return new RefImpl(rawValue, shallow);
  }
  function triggerRef(ref) {
      trigger(toRaw(ref), "set" /* SET */, 'value', 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.__v_isRef = true;
          const { get, set } = factory(() => track(this, "get" /* GET */, 'value'), () => trigger(this, "set" /* SET */, 'value'));
          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) {
          this._object = _object;
          this._key = _key;
          this.__v_isRef = true;
      }
      get value() {
          return this._object[this._key];
      }
      set value(newVal) {
          this._object[this._key] = newVal;
      }
  }
  function toRef(object, key) {
      return isRef(object[key])
          ? object[key]
          : new ObjectRefImpl(object, key);
  }

  class ComputedRefImpl {
      constructor(getter, _setter, isReadonly) {
          this._setter = _setter;
          this._dirty = true;
          this.__v_isRef = true;
          this.effect = effect(getter, {
              lazy: true,
              scheduler: () => {
                  if (!this._dirty) {
                      this._dirty = true;
                      trigger(toRaw(this), "set" /* SET */, 'value');
                  }
              }
          });
          this["__v_isReadonly" /* IS_READONLY */] = isReadonly;
      }
      get value() {
          // the computed ref may get wrapped by other proxies e.g. readonly() #3376
          const self = toRaw(this);
          if (self._dirty) {
              self._value = this.effect();
              self._dirty = false;
          }
          track(self, "get" /* GET */, 'value');
          return self._value;
      }
      set value(newValue) {
          this._setter(newValue);
      }
  }
  function computed(getterOrOptions) {
      let getter;
      let setter;
      if (isFunction(getterOrOptions)) {
          getter = getterOrOptions;
          setter = () => {
                  console.warn('Write operation failed: computed value is readonly');
              }
              ;
      }
      else {
          getter = getterOrOptions.get;
          setter = getterOrOptions.set;
      }
      return new ComputedRefImpl(getter, setter, isFunction(getterOrOptions) || !getterOrOptions.set);
  }

  exports.ITERATE_KEY = ITERATE_KEY;
  exports.computed = computed;
  exports.customRef = customRef;
  exports.effect = effect;
  exports.enableTracking = enableTracking;
  exports.isProxy = isProxy;
  exports.isReactive = isReactive;
  exports.isReadonly = isReadonly;
  exports.isRef = isRef;
  exports.markRaw = markRaw;
  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;

}({}));
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