abon/dist/abon.esm.js

Flexible state management for React 🚀

import isEqual from 'lodash-es/isEqual';
import React from 'react';
import { useClearedMemo } from 'use-cleared-memo';
import { useSafeForceUpdate } from 'use-safe-force-update';
import merge from 'lodash-es/merge';
import _set from 'lodash-es/set';
import _get from 'lodash-es/get';
import uniqBy from 'lodash-es/uniqBy';

function asyncGeneratorStep(gen, resolve, reject, _next, _throw, key, arg) {
  try {
    var info = gen[key](arg);
    var value = info.value;
  } catch (error) {
    reject(error);
    return;
  }

  if (info.done) {
    resolve(value);
  } else {
    Promise.resolve(value).then(_next, _throw);
  }
}

function _asyncToGenerator(fn) {
  return function () {
    var self = this,
        args = arguments;
    return new Promise(function (resolve, reject) {
      var gen = fn.apply(self, args);

      function _next(value) {
        asyncGeneratorStep(gen, resolve, reject, _next, _throw, "next", value);
      }

      function _throw(err) {
        asyncGeneratorStep(gen, resolve, reject, _next, _throw, "throw", err);
      }

      _next(undefined);
    });
  };
}

function _defineProperties(target, props) {
  for (var i = 0; i < props.length; i++) {
    var descriptor = props[i];
    descriptor.enumerable = descriptor.enumerable || false;
    descriptor.configurable = true;
    if ("value" in descriptor) descriptor.writable = true;
    Object.defineProperty(target, descriptor.key, descriptor);
  }
}

function _createClass(Constructor, protoProps, staticProps) {
  if (protoProps) _defineProperties(Constructor.prototype, protoProps);
  if (staticProps) _defineProperties(Constructor, staticProps);
  return Constructor;
}

function _extends() {
  _extends = Object.assign || function (target) {
    for (var i = 1; i < arguments.length; i++) {
      var source = arguments[i];

      for (var key in source) {
        if (Object.prototype.hasOwnProperty.call(source, key)) {
          target[key] = source[key];
        }
      }
    }

    return target;
  };

  return _extends.apply(this, arguments);
}

function _inheritsLoose(subClass, superClass) {
  subClass.prototype = Object.create(superClass.prototype);
  subClass.prototype.constructor = subClass;
  subClass.__proto__ = superClass;
}

function _getPrototypeOf(o) {
  _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) {
    return o.__proto__ || Object.getPrototypeOf(o);
  };
  return _getPrototypeOf(o);
}

function _setPrototypeOf(o, p) {
  _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) {
    o.__proto__ = p;
    return o;
  };

  return _setPrototypeOf(o, p);
}

function _isNativeReflectConstruct() {
  if (typeof Reflect === "undefined" || !Reflect.construct) return false;
  if (Reflect.construct.sham) return false;
  if (typeof Proxy === "function") return true;

  try {
    Date.prototype.toString.call(Reflect.construct(Date, [], function () {}));
    return true;
  } catch (e) {
    return false;
  }
}

function _construct(Parent, args, Class) {
  if (_isNativeReflectConstruct()) {
    _construct = Reflect.construct;
  } else {
    _construct = function _construct(Parent, args, Class) {
      var a = [null];
      a.push.apply(a, args);
      var Constructor = Function.bind.apply(Parent, a);
      var instance = new Constructor();
      if (Class) _setPrototypeOf(instance, Class.prototype);
      return instance;
    };
  }

  return _construct.apply(null, arguments);
}

function _isNativeFunction(fn) {
  return Function.toString.call(fn).indexOf("[native code]") !== -1;
}

function _wrapNativeSuper(Class) {
  var _cache = typeof Map === "function" ? new Map() : undefined;

  _wrapNativeSuper = function _wrapNativeSuper(Class) {
    if (Class === null || !_isNativeFunction(Class)) return Class;

    if (typeof Class !== "function") {
      throw new TypeError("Super expression must either be null or a function");
    }

    if (typeof _cache !== "undefined") {
      if (_cache.has(Class)) return _cache.get(Class);

      _cache.set(Class, Wrapper);
    }

    function Wrapper() {
      return _construct(Class, arguments, _getPrototypeOf(this).constructor);
    }

    Wrapper.prototype = Object.create(Class.prototype, {
      constructor: {
        value: Wrapper,
        enumerable: false,
        writable: true,
        configurable: true
      }
    });
    return _setPrototypeOf(Wrapper, Class);
  };

  return _wrapNativeSuper(Class);
}

function _assertThisInitialized(self) {
  if (self === void 0) {
    throw new ReferenceError("this hasn't been initialised - super() hasn't been called");
  }

  return self;
}

/**
 * Similar to constructing a subscription to a value using `useClearedMemo`, but this also allows for making
 * sure that the most recently notified value is equal to the current value when constructing the subscription.
 * This solves the problem that `useClearedMemo` may call the getter function inside an effect.
 */

function useClearedValueSubscription(initialValue, getValue, onValueDiff, valueSubscriber, deps) {
  if (deps === void 0) {
    deps = [];
  }

  var value = React.useRef(initialValue);
  useClearedMemo(function () {
    var currentValue = getValue();

    if (value.current !== currentValue) {
      value.current = currentValue;
      onValueDiff();
    }

    var subscribed = valueSubscriber(function (currentValue) {
      value.current = currentValue;
      onValueDiff();
    });
    return subscribed;
  }, function (unsubscribe) {
    return unsubscribe();
  }, deps);
  return value;
}
function validateListener(listener) {
  if (typeof listener !== "function") {
    throw new Error('The listener must be a function, got "' + String(listener) + '".');
  }
}

function composedSubscription(listener, listen) {
  validateListener(listener);
  return mergeUnsubscriber(listen(listener));
}
function hydratedSubscription(listener, listen, listenHydrate) {
  validateListener(listener);
  var unsubscribe;

  function hydrateSubscription() {
    if (typeof unsubscribe === "function") {
      unsubscribe();
    }

    unsubscribe = listen(listener);
  }

  var unsubscribeHydrate = composedHandler(hydrateSubscription, listenHydrate);
  return function unsubscribeHydratedSubscription() {
    if (typeof unsubscribeHydrate === "function") {
      unsubscribeHydrate();
      unsubscribeHydrate = undefined;
    }

    if (typeof unsubscribe === "function") {
      unsubscribe();
      unsubscribe = undefined;
    }
  };
}
function hydratedComposedSubscription(listener, listen, listenHydrate) {
  validateListener(listener);
  var unsubscribe;

  function hydrateSubscription() {
    if (typeof unsubscribe === "function") {
      unsubscribe();
    }

    unsubscribe = composedSubscription(listener, listen);
  }

  var unsubscribeHydrate = composedHandler(hydrateSubscription, listenHydrate);
  return function unsubscribeHydratedSubscription() {
    if (typeof unsubscribeHydrate === "function") {
      unsubscribeHydrate();
      unsubscribeHydrate = undefined;
    }

    if (typeof unsubscribe === "function") {
      unsubscribe();
      unsubscribe = undefined;
    }
  };
}
function composedHandler(handler, listen) {
  validateListener(handler);
  handler();
  return composedSubscription(handler, listen);
}
function hydratedComposedHandler(handler, listen, listenHydrate) {
  validateListener(handler);
  var unsubscribe;

  function hydrateSubscription() {
    if (typeof unsubscribe === "function") {
      unsubscribe();
    }

    unsubscribe = composedSubscription(handler, listen);
    handler();
  }

  var unsubscribeHydrate = composedHandler(hydrateSubscription, listenHydrate);
  return function unsubscribeHydratedSubscription() {
    if (typeof unsubscribeHydrate === "function") {
      unsubscribeHydrate();
      unsubscribeHydrate = undefined;
    }

    if (typeof unsubscribe === "function") {
      unsubscribe();
      unsubscribe = undefined;
    }
  };
}
function useComposedSubscription(listener, listen, deps) {
  if (deps === void 0) {
    deps = [];
  }

  useClearedMemo(function () {
    return composedSubscription(listener, listen);
  }, function (unsubscribe) {
    return unsubscribe();
  }, deps);
}
function useHydratedSubscription(listener, listen, listenHydrate, deps) {
  if (deps === void 0) {
    deps = [];
  }

  useClearedMemo(function () {
    return hydratedSubscription(listener, listen, listenHydrate);
  }, function (unsubscribe) {
    return unsubscribe();
  }, deps);
}
function useHydratedComposedSubscription(listener, listen, listenHydrate, deps) {
  if (deps === void 0) {
    deps = [];
  }

  useClearedMemo(function () {
    return hydratedComposedSubscription(listener, listen, listenHydrate);
  }, function (unsubscribe) {
    return unsubscribe();
  }, deps);
}
function useComposedHandler(handler, listen, deps) {
  if (deps === void 0) {
    deps = [];
  }

  useClearedMemo(function () {
    return composedHandler(handler, listen);
  }, function (unsubscribe) {
    return unsubscribe();
  }, deps);
}
function useHydratedComposedHandler(handler, listen, listenHydrate, deps) {
  if (deps === void 0) {
    deps = [];
  }

  useClearedMemo(function () {
    return hydratedComposedHandler(handler, listen, listenHydrate);
  }, function (unsubscribe) {
    return unsubscribe();
  }, deps);
}
function useComposedValue(getValue, listen, deps) {
  if (deps === void 0) {
    deps = [];
  }

  var forceUpdate = useSafeForceUpdate();
  var value = React.useRef();
  useClearedMemo(function () {
    return composedHandler(function () {
      var nextValue = getValue();

      if (!isEqual(value.current, nextValue)) {
        value.current = nextValue;
        forceUpdate();
      }
    }, listen);
  }, function (unsubscribe) {
    return unsubscribe();
  }, deps);
  return value.current;
}
function useHydratedComposedValue(getValue, listen, listenHydrate, deps) {
  if (deps === void 0) {
    deps = [];
  }

  var forceUpdate = useSafeForceUpdate();
  var value = React.useRef();
  useClearedMemo(function () {
    return hydratedComposedHandler(function () {
      var nextValue = getValue();

      if (!isEqual(value.current, nextValue)) {
        value.current = nextValue;
        forceUpdate();
      }
    }, listen, listenHydrate);
  }, function (unsubscribe) {
    return unsubscribe();
  }, deps);
  return value.current;
}
function useComposedValueAsync(getValue, listen, deps) {
  if (deps === void 0) {
    deps = [];
  }

  var forceUpdate = useSafeForceUpdate();
  var value = React.useRef();
  var getting = React.useRef();
  useClearedMemo(function () {
    var gettingMemo = getting.current = Symbol();
    getValue().then(function (nextValue) {
      if (getting.current === gettingMemo && !isEqual(value, nextValue)) {
        value.current = nextValue;
        forceUpdate();
      }
    });
    return composedSubscription(function () {
      var gettingSubscription = getting.current = Symbol();
      getValue().then(function (nextValue) {
        if (getting.current === gettingSubscription && !isEqual(value, nextValue)) {
          value.current = nextValue;
          forceUpdate();
        }
      });
    }, listen);
  }, function (unsubscribe) {
    return unsubscribe();
  }, deps);
  return value.current;
}
function resolve(arg) {
  var listen;

  if (typeof arg.subscribe === "function") {
    listen = arg.subscribe.bind(arg);
  } else {
    listen = arg;
  }

  var setValue;
  var resolved = INITIAL_VALUE;
  var unsubscribe = listen(function (value) {
    if (typeof unsubscribe === "function") {
      unsubscribe();
    }

    resolved = value;

    if (setValue) {
      setValue(value);
    }
  });
  return {
    then: function then(onfulfilled, onrejected) {
      var fulfilled = INITIAL_VALUE;

      if (onfulfilled) {
        if (resolved !== INITIAL_VALUE) {
          fulfilled = onfulfilled(resolved);
        } else {
          setValue = function setValue(value) {
            return onfulfilled(value);
          };
        }
      }

      var promise = new Promise(function (resolve) {
        if (fulfilled !== INITIAL_VALUE) {
          resolve(fulfilled);
        } else if (resolved !== INITIAL_VALUE) {
          if (onfulfilled) {
            resolve(onfulfilled(resolved));
          } else {
            resolve(resolved);
          }
        } else {
          setValue = function setValue(value) {
            if (onfulfilled) {
              resolve(onfulfilled(value));
            } else {
              resolve(value);
            }
          };
        }
      });

      if (onrejected) {
        promise = promise["catch"](onrejected);
      }

      return promise;
    }
  };
}
var INITIAL_VALUE = /*#__PURE__*/Symbol("INITIAL");

function mergeUnsubscriber(result) {
  if (typeof result === "function") {
    return result;
  } else if (Array.isArray(result)) {
    return function () {
      return Array.from(result).forEach(function (unsubscribeFn) {
        return typeof unsubscribeFn === "function" && unsubscribeFn();
      });
    };
  } else {
    return function () {};
  }
}

var Notifier = /*#__PURE__*/function (_Set) {
  _inheritsLoose(Notifier, _Set);

  function Notifier() {
    return _Set.apply(this, arguments) || this;
  }

  var _proto = Notifier.prototype;

  _proto.subscribe = function subscribe(listener) {
    var _this = this;

    this.add(listener);
    return function () {
      return _this.unsubscribe(listener);
    };
  };

  _proto.unsubscribe = function unsubscribe(listener) {
    this["delete"](listener);
  };

  _proto.notify = function notify() {
    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
      args[_key] = arguments[_key];
    }

    Array.from(this.values()).forEach(function (listener) {
      return listener.apply(void 0, args);
    });
    return this;
  };

  Notifier.get = function get(abon) {
    return abon[KEY];
  };

  Notifier.define = function define(abon) {
    Object.defineProperty(abon, KEY, {
      value: new Notifier(),
      configurable: false,
      writable: false,
      enumerable: false
    });
    return abon;
  };

  return Notifier;
}( /*#__PURE__*/_wrapNativeSuper(Set));
var KEY = "__notifier";

/** Retrieve and subscribe to a value. */

var ReadonlyAbon = /*#__PURE__*/function () {
  function ReadonlyAbon() {
    Notifier.define(this);
  }

  var _proto = ReadonlyAbon.prototype;

  _proto.subscribe = function subscribe(listener) {
    validateListener(listener);
    return Notifier.get(this).subscribe(listener);
  };

  _proto.handle = function handle(handler) {
    validateListener(handler);
    handler(this.current);
    return this.subscribe(handler);
  };

  _proto.use = function use() {
    var _this = this;

    var forceUpdate = useSafeForceUpdate();
    useClearedValueSubscription(this.current, function () {
      return _this.current;
    }, forceUpdate, function (listener) {
      return _this.subscribe(listener);
    }, [this, forceUpdate]);
    return this;
  };

  _proto.useSubscription = function useSubscription(listener, deps) {
    var _this2 = this;

    if (deps === void 0) {
      deps = [];
    }

    useClearedMemo(function () {
      return _this2.subscribe(listener);
    }, function (unsubscribe) {
      return unsubscribe();
    }, [this].concat(deps));
  };

  _proto.useHandler = function useHandler(handler, deps) {
    var _this3 = this;

    if (deps === void 0) {
      deps = [];
    }

    useClearedMemo(function () {
      return _this3.handle(handler);
    }, function (unsubscribe) {
      return unsubscribe();
    }, [this].concat(deps));
  };

  return ReadonlyAbon;
}();

/** Subscribe to, retrieve, and update a value. */

var Abon = /*#__PURE__*/function (_ReadonlyAbon) {
  _inheritsLoose(Abon, _ReadonlyAbon);

  function Abon(initial) {
    var _this;

    _this = _ReadonlyAbon.call(this) || this;
    _this.current = initial;
    return _this;
  }

  var _proto = Abon.prototype;

  _proto.set = function set(value) {
    if (!isEqual(this.current, value)) {
      this.current = value;
      Notifier.get(this).notify(value);
    }

    return this;
  };

  _proto.notify = function notify() {
    Notifier.get(this).notify(this.current);
  };

  Abon.use = function use(initial, deps) {
    if (deps === void 0) {
      deps = [];
    }

    return Abon.useRef(initial, deps).use();
  };

  Abon.useRef = function useRef(initial, deps) {
    if (deps === void 0) {
      deps = [];
    }

    return React.useMemo(function () {
      return new Abon(typeof initial === "function" ? initial() : undefined);
    }, deps);
  };

  Abon.from = function from(getValue, listen, unsubscribe) {
    var abon = new Abon(getValue());
    var subscription = composedSubscription(function () {
      abon.set(getValue());
    }, listen);

    if (unsubscribe) {
      if (unsubscribe instanceof Set) {
        unsubscribe.add(subscription);
      } else {
        unsubscribe(subscription);
      }
    }

    return abon;
  };

  Abon.useFrom = function useFrom(listen, initial, deps) {
    if (deps === void 0) {
      deps = [];
    }

    var abon = Abon.use(initial);
    useClearedMemo(function () {
      return listen(abon.set.bind(abon));
    }, function (unsubscribe) {
      return unsubscribe();
    }, [this].concat(deps));
    return abon;
  };

  return Abon;
}(ReadonlyAbon);

/** Subscribe to and update a normal array. */

var AbonArray = /*#__PURE__*/function (_Array) {
  _inheritsLoose(AbonArray, _Array);

  function AbonArray(initial) {
    var _this;

    if (initial === void 0) {
      initial = [];
    }

    _this = _Array.call.apply(_Array, [this].concat(Array.from(initial))) || this;
    Notifier.define(_assertThisInitialized(_this));
    return _this;
  }

  var _proto = AbonArray.prototype;

  _proto.set = function set(items) {
    if (!items || !Array.isArray(items)) {
      items = [];
    }

    if (!isEqual(this.current, items)) {
      this.current = items;
      Notifier.get(this).notify(items);
    }

    return this;
  }
  /** Deletes items from the array */
  ;

  _proto["delete"] = function _delete() {
    for (var _len = arguments.length, items = new Array(_len), _key = 0; _key < _len; _key++) {
      items[_key] = arguments[_key];
    }

    return this.set(this.filter(function (value) {
      return !items.includes(value);
    }));
  }
  /**
   * Appends new items to the end of the list and returns the new amonut of items.
   * @param items New items to append.
   */
  ;

  _proto.push = function push() {
    var _Array$prototype$push;

    for (var _len2 = arguments.length, items = new Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {
      items[_key2] = arguments[_key2];
    }

    (_Array$prototype$push = _Array.prototype.push).call.apply(_Array$prototype$push, [this].concat(items));

    this.notify();
    return this.length;
  }
  /**
   * Inserts new items at the start of the list.
   * @param items  New items to insert at the start of the list.
   */
  ;

  _proto.unshift = function unshift() {
    var _Array$prototype$unsh;

    for (var _len3 = arguments.length, items = new Array(_len3), _key3 = 0; _key3 < _len3; _key3++) {
      items[_key3] = arguments[_key3];
    }

    (_Array$prototype$unsh = _Array.prototype.unshift).call.apply(_Array$prototype$unsh, [this].concat(items));

    this.notify();
    return this.length;
  }
  /** Removes the last item and returns it. */
  ;

  _proto.pop = function pop() {
    if (this.length > 0) {
      var popped = _Array.prototype.pop.call(this);

      this.notify();
      return popped;
    }

    return undefined;
  }
  /** Removes the first item and returns it. */
  ;

  _proto.shift = function shift() {
    if (this.length > 0) {
      var shifted = _Array.prototype.shift.call(this);

      this.notify();
      return shifted;
    }

    return undefined;
  }
  /** Reverse the items */
  ;

  _proto.reverse = function reverse() {
    this.set(this.current.reverse());
    return this;
  };

  _proto.splice = function splice(start, deleteCount) {
    var array = this.current;
    var spliced = array.splice(start, deleteCount);
    this.set(array);
    return spliced;
  };

  _proto.fill = function fill(value, start, end) {
    this.set(this.current.fill(value, start, end));
    return this;
  };

  _proto.map = function map(callbackfn) {
    return this.current.map(callbackfn);
  }
  /** Sorts the array */
  ;

  _proto.sort = function sort(compareFn) {
    return this.set(this.current.sort(compareFn));
  };

  _proto.filter = function filter(callbackfn) {
    return this.current.filter(callbackfn);
  };

  _proto.subscribe = function subscribe(listener) {
    validateListener(listener);
    return Notifier.get(this).subscribe(listener);
  };

  _proto.handle = function handle(handler) {
    validateListener(handler);
    handler(this.current);
    return this.subscribe(handler);
  };

  _proto.use = function use() {
    var _this2 = this;

    var forceUpdate = useSafeForceUpdate();
    useClearedValueSubscription(this.current, function () {
      return _this2.current;
    }, forceUpdate, function (listener) {
      return _this2.subscribe(listener);
    }, [this, forceUpdate]);
    return this;
  };

  _proto.useSubscription = function useSubscription(listener, deps) {
    var _this3 = this;

    if (deps === void 0) {
      deps = [];
    }

    useClearedMemo(function () {
      return _this3.subscribe(listener);
    }, function (unsubscribe) {
      return unsubscribe();
    }, [this].concat(deps));
  }
  /** A read-only version of the instance (for typings). */
  ;

  _proto.notify = function notify() {
    Notifier.get(this).notify(this.current);
  };

  AbonArray.use = function use(initial, deps) {
    if (deps === void 0) {
      deps = [];
    }

    return AbonArray.useRef(initial, deps).use();
  };

  AbonArray.useRef = function useRef(initial, deps) {
    if (deps === void 0) {
      deps = [];
    }

    return React.useMemo(function () {
      return new AbonArray(typeof initial === "function" ? initial() : undefined);
    }, deps);
  };

  _createClass(AbonArray, [{
    key: "current",
    get: function get() {
      return Array.from(this);
    },
    set: function set(items) {
      var _Array$prototype$push2;

      _Array.prototype.splice.call(this, 0);

      (_Array$prototype$push2 = _Array.prototype.push).call.apply(_Array$prototype$push2, [this].concat(items));
    }
  }, {
    key: "readonly",
    get: function get() {
      return this;
    }
  }]);

  return AbonArray;
}( /*#__PURE__*/_wrapNativeSuper(Array));

function createCommonjsModule(fn, module) {
	return module = { exports: {} }, fn(module, module.exports), module.exports;
}

var runtime_1 = createCommonjsModule(function (module) {
/**
 * Copyright (c) 2014-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

var runtime = (function (exports) {

  var Op = Object.prototype;
  var hasOwn = Op.hasOwnProperty;
  var undefined$1; // More compressible than void 0.
  var $Symbol = typeof Symbol === "function" ? Symbol : {};
  var iteratorSymbol = $Symbol.iterator || "@@iterator";
  var asyncIteratorSymbol = $Symbol.asyncIterator || "@@asyncIterator";
  var toStringTagSymbol = $Symbol.toStringTag || "@@toStringTag";

  function wrap(innerFn, outerFn, self, tryLocsList) {
    // If outerFn provided and outerFn.prototype is a Generator, then outerFn.prototype instanceof Generator.
    var protoGenerator = outerFn && outerFn.prototype instanceof Generator ? outerFn : Generator;
    var generator = Object.create(protoGenerator.prototype);
    var context = new Context(tryLocsList || []);

    // The ._invoke method unifies the implementations of the .next,
    // .throw, and .return methods.
    generator._invoke = makeInvokeMethod(innerFn, self, context);

    return generator;
  }
  exports.wrap = wrap;

  // Try/catch helper to minimize deoptimizations. Returns a completion
  // record like context.tryEntries[i].completion. This interface could
  // have been (and was previously) designed to take a closure to be
  // invoked without arguments, but in all the cases we care about we
  // already have an existing method we want to call, so there's no need
  // to create a new function object. We can even get away with assuming
  // the method takes exactly one argument, since that happens to be true
  // in every case, so we don't have to touch the arguments object. The
  // only additional allocation required is the completion record, which
  // has a stable shape and so hopefully should be cheap to allocate.
  function tryCatch(fn, obj, arg) {
    try {
      return { type: "normal", arg: fn.call(obj, arg) };
    } catch (err) {
      return { type: "throw", arg: err };
    }
  }

  var GenStateSuspendedStart = "suspendedStart";
  var GenStateSuspendedYield = "suspendedYield";
  var GenStateExecuting = "executing";
  var GenStateCompleted = "completed";

  // Returning this object from the innerFn has the same effect as
  // breaking out of the dispatch switch statement.
  var ContinueSentinel = {};

  // Dummy constructor functions that we use as the .constructor and
  // .constructor.prototype properties for functions that return Generator
  // objects. For full spec compliance, you may wish to configure your
  // minifier not to mangle the names of these two functions.
  function Generator() {}
  function GeneratorFunction() {}
  function GeneratorFunctionPrototype() {}

  // This is a polyfill for %IteratorPrototype% for environments that
  // don't natively support it.
  var IteratorPrototype = {};
  IteratorPrototype[iteratorSymbol] = function () {
    return this;
  };

  var getProto = Object.getPrototypeOf;
  var NativeIteratorPrototype = getProto && getProto(getProto(values([])));
  if (NativeIteratorPrototype &&
      NativeIteratorPrototype !== Op &&
      hasOwn.call(NativeIteratorPrototype, iteratorSymbol)) {
    // This environment has a native %IteratorPrototype%; use it instead
    // of the polyfill.
    IteratorPrototype = NativeIteratorPrototype;
  }

  var Gp = GeneratorFunctionPrototype.prototype =
    Generator.prototype = Object.create(IteratorPrototype);
  GeneratorFunction.prototype = Gp.constructor = GeneratorFunctionPrototype;
  GeneratorFunctionPrototype.constructor = GeneratorFunction;
  GeneratorFunctionPrototype[toStringTagSymbol] =
    GeneratorFunction.displayName = "GeneratorFunction";

  // Helper for defining the .next, .throw, and .return methods of the
  // Iterator interface in terms of a single ._invoke method.
  function defineIteratorMethods(prototype) {
    ["next", "throw", "return"].forEach(function(method) {
      prototype[method] = function(arg) {
        return this._invoke(method, arg);
      };
    });
  }

  exports.isGeneratorFunction = function(genFun) {
    var ctor = typeof genFun === "function" && genFun.constructor;
    return ctor
      ? ctor === GeneratorFunction ||
        // For the native GeneratorFunction constructor, the best we can
        // do is to check its .name property.
        (ctor.displayName || ctor.name) === "GeneratorFunction"
      : false;
  };

  exports.mark = function(genFun) {
    if (Object.setPrototypeOf) {
      Object.setPrototypeOf(genFun, GeneratorFunctionPrototype);
    } else {
      genFun.__proto__ = GeneratorFunctionPrototype;
      if (!(toStringTagSymbol in genFun)) {
        genFun[toStringTagSymbol] = "GeneratorFunction";
      }
    }
    genFun.prototype = Object.create(Gp);
    return genFun;
  };

  // Within the body of any async function, `await x` is transformed to
  // `yield regeneratorRuntime.awrap(x)`, so that the runtime can test
  // `hasOwn.call(value, "__await")` to determine if the yielded value is
  // meant to be awaited.
  exports.awrap = function(arg) {
    return { __await: arg };
  };

  function AsyncIterator(generator, PromiseImpl) {
    function invoke(method, arg, resolve, reject) {
      var record = tryCatch(generator[method], generator, arg);
      if (record.type === "throw") {
        reject(record.arg);
      } else {
        var result = record.arg;
        var value = result.value;
        if (value &&
            typeof value === "object" &&
            hasOwn.call(value, "__await")) {
          return PromiseImpl.resolve(value.__await).then(function(value) {
            invoke("next", value, resolve, reject);
          }, function(err) {
            invoke("throw", err, resolve, reject);
          });
        }

        return PromiseImpl.resolve(value).then(function(unwrapped) {
          // When a yielded Promise is resolved, its final value becomes
          // the .value of the Promise<{value,done}> result for the
          // current iteration.
          result.value = unwrapped;
          resolve(result);
        }, function(error) {
          // If a rejected Promise was yielded, throw the rejection back
          // into the async generator function so it can be handled there.
          return invoke("throw", error, resolve, reject);
        });
      }
    }

    var previousPromise;

    function enqueue(method, arg) {
      function callInvokeWithMethodAndArg() {
        return new PromiseImpl(function(resolve, reject) {
          invoke(method, arg, resolve, reject);
        });
      }

      return previousPromise =
        // If enqueue has been called before, then we want to wait until
        // all previous Promises have been resolved before calling invoke,
        // so that results are always delivered in the correct order. If
        // enqueue has not been called before, then it is important to
        // call invoke immediately, without waiting on a callback to fire,
        // so that the async generator function has the opportunity to do
        // any necessary setup in a predictable way. This predictability
        // is why the Promise constructor synchronously invokes its
        // executor callback, and why async functions synchronously
        // execute code before the first await. Since we implement simple
        // async functions in terms of async generators, it is especially
        // important to get this right, even though it requires care.
        previousPromise ? previousPromise.then(
          callInvokeWithMethodAndArg,
          // Avoid propagating failures to Promises returned by later
          // invocations of the iterator.
          callInvokeWithMethodAndArg
        ) : callInvokeWithMethodAndArg();
    }

    // Define the unified helper method that is used to implement .next,
    // .throw, and .return (see defineIteratorMethods).
    this._invoke = enqueue;
  }

  defineIteratorMethods(AsyncIterator.prototype);
  AsyncIterator.prototype[asyncIteratorSymbol] = function () {
    return this;
  };
  exports.AsyncIterator = AsyncIterator;

  // Note that simple async functions are implemented on top of
  // AsyncIterator objects; they just return a Promise for the value of
  // the final result produced by the iterator.
  exports.async = function(innerFn, outerFn, self, tryLocsList, PromiseImpl) {
    if (PromiseImpl === void 0) PromiseImpl = Promise;

    var iter = new AsyncIterator(
      wrap(innerFn, outerFn, self, tryLocsList),
      PromiseImpl
    );

    return exports.isGeneratorFunction(outerFn)
      ? iter // If outerFn is a generator, return the full iterator.
      : iter.next().then(function(result) {
          return result.done ? result.value : iter.next();
        });
  };

  function makeInvokeMethod(innerFn, self, context) {
    var state = GenStateSuspendedStart;

    return function invoke(method, arg) {
      if (state === GenStateExecuting) {
        throw new Error("Generator is already running");
      }

      if (state === GenStateCompleted) {
        if (method === "throw") {
          throw arg;
        }

        // Be forgiving, per 25.3.3.3.3 of the spec:
        // https://people.mozilla.org/~jorendorff/es6-draft.html#sec-generatorresume
        return doneResult();
      }

      context.method = method;
      context.arg = arg;

      while (true) {
        var delegate = context.delegate;
        if (delegate) {
          var delegateResult = maybeInvokeDelegate(delegate, context);
          if (delegateResult) {
            if (delegateResult === ContinueSentinel) continue;
            return delegateResult;
          }
        }

        if (context.method === "next") {
          // Setting context._sent for legacy support of Babel's
          // function.sent implementation.
          context.sent = context._sent = context.arg;

        } else if (context.method === "throw") {
          if (state === GenStateSuspendedStart) {
            state = GenStateCompleted;
            throw context.arg;
          }

          context.dispatchException(context.arg);

        } else if (context.method === "return") {
          context.abrupt("return", context.arg);
        }

        state = GenStateExecuting;

        var record = tryCatch(innerFn, self, context);
        if (record.type === "normal") {
          // If an exception is thrown from innerFn, we leave state ===
          // GenStateExecuting and loop back for another invocation.
          state = context.done
            ? GenStateCompleted
            : GenStateSuspendedYield;

          if (record.arg === ContinueSentinel) {
            continue;
          }

          return {
            value: record.arg,
            done: context.done
          };

        } else if (record.type === "throw") {
          state = GenStateCompleted;
          // Dispatch the exception by looping back around to the
          // context.dispatchException(context.arg) call above.
          context.method = "throw";
          context.arg = record.arg;
        }
      }
    };
  }

  // Call delegate.iterator[context.method](context.arg) and handle the
  // result, either by returning a { value, done } result from the
  // delegate iterator, or by modifying context.method and context.arg,
  // setting context.delegate to null, and returning the ContinueSentinel.
  function maybeInvokeDelegate(delegate, context) {
    var method = delegate.iterator[context.method];
    if (method === undefined$1) {
      // A .throw or .return when the delegate iterator has no .throw
      // method always terminates the yield* loop.
      context.delegate = null;

      if (context.method === "throw") {
        // Note: ["return"] must be used for ES3 parsing compatibility.
        if (delegate.iterator["return"]) {
          // If the delegate iterator has a return method, give it a
          // chance to clean up.
          context.method = "return";
          context.arg = undefined$1;
          maybeInvokeDelegate(delegate, context);

          if (context.method === "throw") {
            // If maybeInvokeDelegate(context) changed context.method from
            // "return" to "throw", let that override the TypeError below.
            return ContinueSentinel;
          }
        }

        context.method = "throw";
        context.arg = new TypeError(
          "The iterator does not provide a 'throw' method");
      }

      return ContinueSentinel;
    }

    var record = tryCatch(method, delegate.iterator, context.arg);

    if (record.type === "throw") {
      context.method = "throw";
      context.arg = record.arg;
      context.delegate = null;
      return ContinueSentinel;
    }

    var info = record.arg;

    if (! info) {
      context.method = "throw";
      context.arg = new TypeError("iterator result is not an object");
      context.delegate = null;
      return ContinueSentinel;
    }

    if (info.done) {
      // Assign the result of the finished delegate to the temporary
      // variable specified by delegate.resultName (see delegateYield).
      context[delegate.resultName] = info.value;

      // Resume execution at the desired location (see delegateYield).
      context.next = delegate.nextLoc;

      // If context.method was "throw" but the delegate handled the
      // exception, let the outer generator proceed normally. If
      // context.method was "next", forget context.arg since it has been
      // "consumed" by the delegate iterator. If context.method was
      // "return", allow the original .return call to continue in the
      // outer generator.
      if (context.method !== "return") {
        context.method = "next";
        context.arg = undefined$1;
      }

    } else {
      // Re-yield the result returned by the delegate method.
      return info;
    }

    // The delegate iterator is finished, so forget it and continue with
    // the outer generator.
    context.delegate = null;
    return ContinueSentinel;
  }

  // Define Generator.prototype.{next,throw,return} in terms of the
  // unified ._invoke helper method.
  defineIteratorMethods(Gp);

  Gp[toStringTagSymbol] = "Generator";

  // A Generator should always return itself as the iterator object when the
  // @@iterator function is called on it. Some browsers' implementations of the
  // iterator prototype chain incorrectly implement this, causing the Generator
  // object to not be returned from this call. This ensures that doesn't happen.
  // See https://github.com/facebook/regenerator/issues/274 for more details.
  Gp[iteratorSymbol] = function() {
    return this;
  };

  Gp.toString = function() {
    return "[object Generator]";
  };

  function pushTryEntry(locs) {
    var entry = { tryLoc: locs[0] };

    if (1 in locs) {
      entry.catchLoc = locs[1];
    }

    if (2 in locs) {
      entry.finallyLoc = locs[2];
      entry.afterLoc = locs[3];
    }

    this.tryEntries.push(entry);
  }

  function resetTryEntry(entry) {
    var record = entry.completion || {};
    record.type = "normal";
    delete record.arg;
    entry.completion = record;
  }

  function Context(tryLocsList) {
    // The root entry object (effectively a try statement without a catch
    // or a finally block) gives us a place to store values thrown from
    // locations where there is no enclosing try statement.
    this.tryEntries = [{ tryLoc: "root" }];
    tryLocsList.forEach(pushTryEntry, this);
    this.reset(true);
  }

  exports.keys = function(object) {
    var keys = [];
    for (var key in object) {
      keys.push(key);
    }
    keys.reverse();

    // Rather than returning an object with a next method, we keep
    // things simple and return the next function itself.
    return function next() {
      while (keys.length) {
        var key = keys.pop();
        if (key in object) {
          next.value = key;
          next.done = false;
          return next;
        }
      }

      // To avoid creating an additional object, we just hang the .value
      // and .done properties off the next function object itself. This
      // also ensures that the minifier will not anonymize the function.
      next.done = true;
      return next;
    };
  };

  function values(iterable) {
    if (iterable) {
      var iteratorMethod = iterable[iteratorSymbol];
      if (iteratorMethod) {
        return iteratorMethod.call(iterable);
      }

      if (typeof iterable.next === "function") {
        return iterable;
      }

      if (!isNaN(iterable.length)) {
        var i = -1, next = function next() {
          while (++i < iterable.length) {
            if (hasOwn.call(iterable, i)) {
              next.value = iterable[i];
              next.done = false;
              return next;
            }
          }

          next.value = undefined$1;
          next.done = true;

          return next;
        };

        return next.next = next;
      }
    }

    // Return an iterator with no values.
    return { next: doneResult };
  }
  exports.values = values;

  function doneResult() {
    return { value: undefined$1, done: true };
  }

  Context.prototype = {
    constructor: Context,

    reset: function(skipTempReset) {
      this.prev = 0;
      this.next = 0;
      // Resetting context._sent for legacy support of Babel's
      // function.sent implementation.
      this.sent = this._sent = undefined$1;
      this.done = false;
      this.delegate = null;

      this.method = "next";
      this.arg = undefined$1;

      this.tryEntries.forEach(resetTryEntry);

      if (!skipTempReset) {
        for (var name in this) {
          // Not sure about the optimal order of these conditions:
          if (name.charAt(0) === "t" &&
              hasOwn.call(this, name) &&
              !isNaN(+name.slice(1))) {
            this[name] = undefined$1;
          }
        }
      }
    },

    stop: function() {
      this.done = true;

      var rootEntry = this.tryEntries[0];
      var rootRecord = rootEntry.completion;
      if (rootRecord.type === "throw") {
        throw rootRecord.arg;
      }

      return this.rval;
    },

    dispatchException: function(exception) {
      if (this.done) {
        throw exception;
      }

      var context = this;
      function handle(loc, caught) {
        record.type = "throw";
        record.arg = exception;
        context.next = loc;

        if (caught) {
          // If the dispatched exception was caught by a catch block,
          // then let that catch block handle the exception normally.
          context.method = "next";
          context.arg = undefined$1;
        }

        return !! caught;
      }

      for (var i = this.tryEntries.length - 1; i >= 0; --i) {
        var entry = this.tryEntries[i];
        var record = entry.completion;

        if (entry.tryLoc === "root") {
          // Exception thrown outside of any try block that could handle
          // it, so set the completion value of the entire function to
          // throw the exception.
          return handle("end");
        }

        if (entry.tryLoc <= this.prev) {
          var hasCatch = hasOwn.call(entry, "catchLoc");
          var hasFinally = hasOwn.call(entry, "finallyLoc");

          if (hasCatch && hasFinally) {
            if (this.prev < entry.catchLoc) {
              return handle(entry.catchLoc, true);
            } else if (this.prev < entry.finallyLoc) {
              return handle(entry.finallyLoc);
            }

          } else if (hasCatch) {
            if (this.prev < entry.catchLoc) {
              return handle(entry.catchLoc, true);
            }

          } else if (hasFinally) {
            if (this.prev < entry.finallyLoc) {
              return handle(entry.finallyLoc);
            }

          } else {
            throw new Error("try statement without catch or finally");
          }
        }
      }
    },

    abrupt: function(type, arg) {
      for (var i = this.tryEntries.length - 1; i >= 0; --i) {
        var entry = this.tryEntries[i];
        if (entry.tryLoc <= this.prev &&
            hasOwn.call(entry, "finallyLoc") &&
            this.prev < entry.finallyLoc) {
          var finallyEntry = entry;
          break;
        }
      }

      if (finallyEntry &&
          (type === "break" ||
           type === "continue") &&
          finallyEntry.tryLoc <= arg &&
          arg <= finallyEntry.finallyLoc) {
        // Ignore the finally entry if control is not jumping to a
        // location outside the try/catch block.
        finallyEntry = null;
      }

      var record = finallyEntry ? finallyEntry.completion : {};
      record.type = type;
      record.arg = arg;

      if (finallyEntry) {
        this.method = "next";
        this.next = finallyEntry.finallyLoc;
        return ContinueSentinel;
      }

      return this.complete(record);
    },

    complete: function(record, afterLoc) {
      if (record.type === "throw") {
        throw record.arg;
      }

      if (record.type === "break" ||
          record.type === "continue") {
        this.next = record.arg;
      } else if (record.type === "return") {
        this.rval = this.arg = record.arg;
        this.method = "return";
        this.next = "end";
      } else if (record.type === "normal" && afterLoc) {
        this.next = afterLoc;
      }

      return ContinueSentinel;
    },

    finish: function(finallyLoc) {
      for (var i = this.tryEntries.length - 1; i >= 0; --i) {
        var entry = this.tryEntries[i];
        if (entry.finallyLoc === finallyLoc) {
          this.complete(entry.completion, entry.afterLoc);
          resetTryEntry(entry);
          return ContinueSentinel;
        }
      }
    },

    "catch": function(tryLoc) {
      for (var i = this.tryEntries.length - 1; i >= 0; --i) {
        var entry = this.tryEntries[i];
        if (entry.tryLoc === tryLoc) {
          var record = entry.completion;
          if (record.type === "throw") {
            var thrown = record.arg;
            resetTryEntry(entry);
          }
          return thrown;
        }
      }

      // The context.catch method must only be called with a location
      // argument that corresponds to a known catch block.
      throw new Error("illegal catch attempt");
    },

    delegateYield: function(iterable, resultName, nextLoc) {
      this.delegate = {
        iterator: values(iterable),
        resultName: resultName,
        nextLoc: nextLoc
      };

      if (this.method === "next") {
        // Deliberately forget the last sent value so that we don't
        // accidentally pass it on to the delegate.
        this.arg = undefined$1;
      }

      return ContinueSentinel;
    }
  };

  // Regardless of whether this script is executing as a CommonJS module
  // or not, return the runtime object so that we can declare the variable
  // regeneratorRuntime in the outer scope, which allows this module to be
  // injected easily by `bin/regenerator --include-runtime script.js`.
  return exports;

}(
  // If this script is executing as a CommonJS module, use module.exports
  // as the regeneratorRuntime namespace. Otherwise create a new empty
  // object. Either way, the resulting object will be used to initialize
  // the regeneratorRuntime variable at the top of this file.
   module.exports 
));

try {
  regeneratorRuntime = runtime;
} catch (accidentalStrictMode) {
  // This module should not be running in strict mode, so the above
  // assignment should always work unless something is misconfigured. Just
  // in case runtime.js accidentally runs in strict mode, we can escape
  // strict mode using a global Function call. This could conceivably fail
  // if a Content Security Policy forbids using Function, but in that case
  // the proper solution is to fix the accidental strict mode problem. If
  // you've misconfigured your bundler to force strict mode and applied a
  // CSP to forbid Function, and you're not willing to fix either of those
  // problems, please detail your unique predicament in a GitHub issue.
  Function("r", "regeneratorRuntime = r")(runtime);
}
});

/** Subscribe to, retrieve, and asynchronously update a value, where an action to set a value can be interrupted.
 * `AbonAsync` is not intended to be used by itself, but rather to be extended and implementing the `set` method. */

var AbonAsync = /*#__PURE__*/function () {
  function AbonAsync(initial) {
    this.current = initial;
    Notifier.define(this);
    Object.defineProperty(this, "__promiseNotifier", {
      value: new Notifier(),
      configurable: false,
      writable: false,
      enumerable: false
    });
  }

  var _proto = AbonAsync.prototype;

  _proto.set = /*#__PURE__*/function () {
    var _set = /*#__PURE__*/_asyncToGenerator( /*#__PURE__*/runtime_1.mark(function _callee(valueOrPromise, onSet) {
      var _this = this;

      var dispatchId, value;
      return runtime_1.wrap(function _callee$(_context) {
        while (1) {
          switch (_context.prev = _context.next) {
            case 0:
              if (!(valueOrPromise && valueOrPromise["then"])) {
                _context.next = 4;
                break;
              }

              dispatchId = Symbol();
              this.__dispatchId = dispatchId;
              return _context.abrupt("return", valueOrPromise.then(function (value) {
                if (_this.__dispatchId === dispatchId) {
                  delete _this.__dispatchId;
                  _this.__previousDispatchId = dispatchId;

                  if (!isEqual(_this.current, value)) {
                    _this.current = value;
                    Notifier.get(_this).notify(value);

                    _this.__promiseNotifier.notify(undefined);

                    if (typeof onSet === "function") {
                      return Promise.resolve(onSet()).then(function () {
                        return _this;
                      });
                    }
                  } else {
                    _this.__promiseNotifier.notify(undefined);
                  }
                }

                return _this;
              }));

            case 4:
              delete this.__dispatchId;
              value = valueOrPromise;

              if (!isEqual(this.current, value)) {
                this.current = value;
                Notifier.get(this).notify(value);
              }

              this.__promiseNotifier.notify(undefined);

              return _context.abrupt("return", this);

            case 9:
            case "end":
              return _context.stop();
          }
        }
      }, _callee, this);
    }));

    function set(_x, _x2) {
      return _set.apply(this, arguments);
    }

    return set;
  }();

  _proto.dispatch = /*#__PURE__*/function () {
    var _dispatch = /*#__PURE__*/_asyncToGenerator( /*#__PURE__*/runtime_1.mark(function _callee2(promise, onUninterrupted) {
      var dispatchId, currentDispatchExists, resolved;
      return runtime_1.wrap(function _callee2$(_context2) {
        while (1) {
          switch (_context2.prev = _context2.next)