immer/dist/immer.cjs.development.js

Create your next immutable state by mutating the current one

'use strict';

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

var _ref;

// Should be no imports here!
// SOme things that should be evaluated before all else...
var hasSymbol = typeof Symbol !== "undefined";
var hasMap = typeof Map !== "undefined";
var hasSet = typeof Set !== "undefined";
var hasProxies = typeof Proxy !== "undefined" && typeof Proxy.revocable !== "undefined" && typeof Reflect !== "undefined";
/**
 * The sentinel value returned by producers to replace the draft with undefined.
 */

var NOTHING = hasSymbol ?
/*#__PURE__*/
Symbol("immer-nothing") : (_ref = {}, _ref["immer-nothing"] = true, _ref);
/**
 * To let Immer treat your class instances as plain immutable objects
 * (albeit with a custom prototype), you must define either an instance property
 * or a static property on each of your custom classes.
 *
 * Otherwise, your class instance will never be drafted, which means it won't be
 * safe to mutate in a produce callback.
 */

var DRAFTABLE = hasSymbol ?
/*#__PURE__*/
Symbol("immer-draftable") : "__$immer_draftable";
var DRAFT_STATE = hasSymbol ?
/*#__PURE__*/
Symbol("immer-state") : "__$immer_state";
var iteratorSymbol = hasSymbol ? Symbol.iterator : "@@iterator";

var errors = {
  0: "Illegal state",
  1: "Immer drafts cannot have computed properties",
  2: "This object has been frozen and should not be mutated",
  3: function _(data) {
    return "Cannot use a proxy that has been revoked. Did you pass an object from inside an immer function to an async process? " + data;
  },
  4: "An immer producer returned a new value *and* modified its draft. Either return a new value *or* modify the draft.",
  5: "Immer forbids circular references",
  6: "The first or second argument to `produce` must be a function",
  7: "The third argument to `produce` must be a function or undefined",
  8: "First argument to `createDraft` must be a plain object, an array, or an immerable object",
  9: "First argument to `finishDraft` must be a draft returned by `createDraft`",
  10: "The given draft is already finalized",
  11: "Object.defineProperty() cannot be used on an Immer draft",
  12: "Object.setPrototypeOf() cannot be used on an Immer draft",
  13: "Immer only supports deleting array indices",
  14: "Immer only supports setting array indices and the 'length' property",
  15: function _(path) {
    return "Cannot apply patch, path doesn't resolve: " + path;
  },
  16: 'Sets cannot have "replace" patches.',
  17: function _(op) {
    return "Unsupported patch operation: " + op;
  },
  18: function _(plugin) {
    return "The plugin for '" + plugin + "' has not been loaded into Immer. To enable the plugin, import and call `enable" + plugin + "()` when initializing your application.";
  },
  19: "plugin not loaded",
  20: "Cannot use proxies if Proxy, Proxy.revocable or Reflect are not available"
};
function die(error) {
  for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
    args[_key - 1] = arguments[_key];
  }

  {
    var e = errors[error];
    var msg = !e ? "unknown error nr: " + error : typeof e === "function" ? e.apply(null, args) : e;
    throw new Error("[Immer] " + msg);
  }
}

var ArchtypeObject = 0;
var ArchtypeArray = 1;
var ArchtypeMap = 2;
var ArchtypeSet = 3;
var ProxyTypeProxyObject = 0;
var ProxyTypeProxyArray = 1;
var ProxyTypeES5Object = 4;
var ProxyTypeES5Array = 5;
var ProxyTypeMap = 2;
var ProxyTypeSet = 3;

/** Returns true if the given value is an Immer draft */

/*#__PURE__*/

function isDraft(value) {
  return !!value && !!value[DRAFT_STATE];
}
/** Returns true if the given value can be drafted by Immer */

/*#__PURE__*/

function isDraftable(value) {
  if (!value) return false;
  return isPlainObject(value) || Array.isArray(value) || !!value[DRAFTABLE] || !!value.constructor[DRAFTABLE] || isMap(value) || isSet(value);
}
/*#__PURE__*/

function isPlainObject(value) {
  if (!value || typeof value !== "object") return false;
  var proto = Object.getPrototypeOf(value);
  return !proto || proto === Object.prototype;
}
function original(value) {
  if (value && value[DRAFT_STATE]) {
    return value[DRAFT_STATE].base_;
  } // otherwise return undefined

}
/*#__PURE__*/

var ownKeys = typeof Reflect !== "undefined" && Reflect.ownKeys ? Reflect.ownKeys : typeof Object.getOwnPropertySymbols !== "undefined" ? function (obj) {
  return Object.getOwnPropertyNames(obj).concat(Object.getOwnPropertySymbols(obj));
} :
/* istanbul ignore next */
Object.getOwnPropertyNames;
function each(obj, iter) {
  if (getArchtype(obj) === ArchtypeObject) {
    ownKeys(obj).forEach(function (key) {
      return iter(key, obj[key], obj);
    });
  } else {
    obj.forEach(function (entry, index) {
      return iter(index, entry, obj);
    });
  }
}
/*#__PURE__*/

function getArchtype(thing) {
  /* istanbul ignore next */
  var state = thing[DRAFT_STATE];
  return state ? state.type_ > 3 ? state.type_ - 4 // cause Object and Array map back from 4 and 5
  : state.type_ // others are the same
  : Array.isArray(thing) ? ArchtypeArray : isMap(thing) ? ArchtypeMap : isSet(thing) ? ArchtypeSet : ArchtypeObject;
}
/*#__PURE__*/

function has(thing, prop) {
  return getArchtype(thing) === ArchtypeMap ? thing.has(prop) : Object.prototype.hasOwnProperty.call(thing, prop);
}
/*#__PURE__*/

function get(thing, prop) {
  // @ts-ignore
  return getArchtype(thing) === ArchtypeMap ? thing.get(prop) : thing[prop];
}
/*#__PURE__*/

function set(thing, propOrOldValue, value) {
  var t = getArchtype(thing);
  if (t === ArchtypeMap) thing.set(propOrOldValue, value);else if (t === ArchtypeSet) {
    thing.delete(propOrOldValue);
    thing.add(value);
  } else thing[propOrOldValue] = value;
}
/*#__PURE__*/

function is(x, y) {
  // From: https://github.com/facebook/fbjs/blob/c69904a511b900266935168223063dd8772dfc40/packages/fbjs/src/core/shallowEqual.js
  if (x === y) {
    return x !== 0 || 1 / x === 1 / y;
  } else {
    return x !== x && y !== y;
  }
}
/*#__PURE__*/

function isMap(target) {
  return hasMap && target instanceof Map;
}
/*#__PURE__*/

function isSet(target) {
  return hasSet && target instanceof Set;
}
/*#__PURE__*/

function latest(state) {
  return state.copy_ || state.base_;
}
function shallowCopy(base, invokeGetters) {
  if (invokeGetters === void 0) {
    invokeGetters = false;
  }

  if (Array.isArray(base)) return base.slice();
  var clone = Object.create(Object.getPrototypeOf(base));
  each(base, function (key) {
    if (key === DRAFT_STATE) {
      return; // Never copy over draft state.
    }

    var desc = Object.getOwnPropertyDescriptor(base, key);
    var value = desc.value;

    if (desc.get) {
      if (!invokeGetters) die(1);
      value = desc.get.call(base);
    }

    if (desc.enumerable) {
      clone[key] = value;
    } else {
      Object.defineProperty(clone, key, {
        value: value,
        writable: true,
        configurable: true
      });
    }
  });
  return clone;
}
function freeze(obj, deep) {
  if (isDraft(obj) || Object.isFrozen(obj) || !isDraftable(obj)) return;

  if (getArchtype(obj) > 1
  /* Map or Set */
  ) {
      obj.set = obj.add = obj.clear = obj.delete = dontMutateFrozenCollections;
    }

  Object.freeze(obj);
  if (deep) each(obj, function (_, value) {
    return freeze(value, true);
  });
}

function dontMutateFrozenCollections() {
  die(2);
}

/** Plugin utilities */

var plugins = {};
function getPlugin(pluginKey) {
  var plugin = plugins[pluginKey];

  if (!plugin) {
    die( 18 , pluginKey);
  } // @ts-ignore


  return plugin;
}
function loadPlugin(pluginKey, implementation) {
  plugins[pluginKey] = implementation;
}

var currentScope;
function getCurrentScope() {
  if ( !currentScope) die(0);
  return currentScope;
}

function createScope(parent_, immer_) {
  return {
    drafts_: [],
    parent_: parent_,
    immer_: immer_,
    // Whenever the modified draft contains a draft from another scope, we
    // need to prevent auto-freezing so the unowned draft can be finalized.
    canAutoFreeze_: true,
    unfinalizedDrafts_: 0
  };
}

function usePatchesInScope(scope, patchListener) {
  if (patchListener) {
    getPlugin("Patches"); // assert we have the plugin

    scope.patches_ = [];
    scope.inversePatches_ = [];
    scope.patchListener_ = patchListener;
  }
}
function revokeScope(scope) {
  leaveScope(scope);
  scope.drafts_.forEach(revokeDraft); // @ts-ignore

  scope.drafts_ = null;
}
function leaveScope(scope) {
  if (scope === currentScope) {
    currentScope = scope.parent_;
  }
}
function enterScope(immer) {
  return currentScope = createScope(currentScope, immer);
}

function revokeDraft(draft) {
  var state = draft[DRAFT_STATE];
  if (state.type_ === ProxyTypeProxyObject || state.type_ === ProxyTypeProxyArray) state.revoke_();else state.revoked_ = true;
}

function processResult(result, scope) {
  scope.unfinalizedDrafts_ = scope.drafts_.length;
  var baseDraft = scope.drafts_[0];
  var isReplaced = result !== undefined && result !== baseDraft;
  if (!scope.immer_.useProxies_) getPlugin("ES5").willFinalizeES5_(scope, result, isReplaced);

  if (isReplaced) {
    if (baseDraft[DRAFT_STATE].modified_) {
      revokeScope(scope);
      die(4);
    }

    if (isDraftable(result)) {
      // Finalize the result in case it contains (or is) a subset of the draft.
      result = finalize(scope, result);
      if (!scope.parent_) maybeFreeze(scope, result);
    }

    if (scope.patches_) {
      getPlugin("Patches").generateReplacementPatches_(baseDraft[DRAFT_STATE], result, scope.patches_, scope.inversePatches_);
    }
  } else {
    // Finalize the base draft.
    result = finalize(scope, baseDraft, []);
  }

  revokeScope(scope);

  if (scope.patches_) {
    scope.patchListener_(scope.patches_, scope.inversePatches_);
  }

  return result !== NOTHING ? result : undefined;
}

function finalize(rootScope, value, path) {
  // Don't recurse in tho recursive data structures
  if (Object.isFrozen(value)) return value;
  var state = value[DRAFT_STATE]; // A plain object, might need freezing, might contain drafts

  if (!state) {
    each(value, function (key, childValue) {
      return finalizeProperty(rootScope, state, value, key, childValue, path);
    });
    return value;
  } // Never finalize drafts owned by another scope.


  if (state.scope_ !== rootScope) return value; // Unmodified draft, return the (frozen) original

  if (!state.modified_) {
    maybeFreeze(rootScope, state.base_, true);
    return state.base_;
  } // Not finalized yet, let's do that now


  if (!state.finalized_) {
    state.finalized_ = true;
    state.scope_.unfinalizedDrafts_--;
    var result = // For ES5, create a good copy from the draft first, with added keys and without deleted keys.
    state.type_ === ProxyTypeES5Object || state.type_ === ProxyTypeES5Array ? state.copy_ = shallowCopy(state.draft_, true) : state.copy_; // finalize all children of the copy

    each(result, function (key, childValue) {
      return finalizeProperty(rootScope, state, result, key, childValue, path);
    }); // everything inside is frozen, we can freeze here

    maybeFreeze(rootScope, result, false); // first time finalizing, let's create those patches

    if (path && rootScope.patches_) {
      getPlugin("Patches").generatePatches_(state, path, rootScope.patches_, rootScope.inversePatches_);
    }
  }

  return state.copy_;
}

function finalizeProperty(rootScope, parentState, targetObject, prop, childValue, rootPath) {
  if ( childValue === targetObject) die(5);

  if (isDraft(childValue)) {
    var path = rootPath && parentState && parentState.type_ !== ProxyTypeSet && // Set objects are atomic since they have no keys.
    !has(parentState.assigned_, prop) // Skip deep patches for assigned keys.
    ? rootPath.concat(prop) : undefined; // Drafts owned by `scope` are finalized here.

    var res = finalize(rootScope, childValue, path);
    set(targetObject, prop, res); // Drafts from another scope must prevented to be frozen
    // if we got a draft back from finalize, we're in a nested produce and shouldn't freeze

    if (isDraft(res)) {
      rootScope.canAutoFreeze_ = false;
    } else return;
  } // Unchanged draft properties are ignored.


  if (parentState && is(childValue, get(parentState.base_, prop))) {
    return;
  } // Search new objects for unfinalized drafts. Frozen objects should never contain drafts.


  if (isDraftable(childValue)) {
    if (!rootScope.immer_.autoFreeze_ && rootScope.unfinalizedDrafts_ < 1) {
      // optimization: if an object is not a draft, and we don't have to
      // deepfreeze everything, and we are sure that no drafts are left in the remaining object
      // cause we saw and finalized all drafts already; we can stop visiting the rest of the tree.
      // This benefits especially adding large data tree's without further processing.
      // See add-data.js perf test
      return;
    }

    finalize(rootScope, childValue); // immer deep freezes plain objects, so if there is no parent state, we freeze as well

    if (!parentState || !parentState.scope_.parent_) maybeFreeze(rootScope, childValue);
  }
}

function maybeFreeze(scope, value, deep) {
  if (deep === void 0) {
    deep = false;
  }

  if (scope.immer_.autoFreeze_ && scope.canAutoFreeze_) {
    freeze(value, deep);
  }
}

/**
 * Returns a new draft of the `base` object.
 *
 * The second argument is the parent draft-state (used internally).
 */

function createProxyProxy(base, parent) {
  var isArray = Array.isArray(base);
  var state = {
    type_: isArray ? ProxyTypeProxyArray : ProxyTypeProxyObject,
    // Track which produce call this is associated with.
    scope_: parent ? parent.scope_ : getCurrentScope(),
    // True for both shallow and deep changes.
    modified_: false,
    // Used during finalization.
    finalized_: false,
    // Track which properties have been assigned (true) or deleted (false).
    assigned_: {},
    // The parent draft state.
    parent_: parent,
    // The base state.
    base_: base,
    // The base proxy.
    draft_: null,
    // Any property proxies.
    drafts_: {},
    // The base copy with any updated values.
    copy_: null,
    // Called by the `produce` function.
    revoke_: null,
    isManual_: false
  }; // the traps must target something, a bit like the 'real' base.
  // but also, we need to be able to determine from the target what the relevant state is
  // (to avoid creating traps per instance to capture the state in closure,
  // and to avoid creating weird hidden properties as well)
  // So the trick is to use 'state' as the actual 'target'! (and make sure we intercept everything)
  // Note that in the case of an array, we put the state in an array to have better Reflect defaults ootb

  var target = state;
  var traps = objectTraps;

  if (isArray) {
    target = [state];
    traps = arrayTraps;
  }

  var _Proxy$revocable = Proxy.revocable(target, traps),
      revoke = _Proxy$revocable.revoke,
      proxy = _Proxy$revocable.proxy;

  state.draft_ = proxy;
  state.revoke_ = revoke;
  return proxy;
}
/**
 * Object drafts
 */

var objectTraps = {
  get: function get(state, prop) {
    if (prop === DRAFT_STATE) return state;
    var drafts = state.drafts_; // Check for existing draft in unmodified state.

    if (!state.modified_ && has(drafts, prop)) {
      return drafts[prop];
    }

    var value = latest(state)[prop];

    if (state.finalized_ || !isDraftable(value)) {
      return value;
    } // Check for existing draft in modified state.


    if (state.modified_) {
      // Assigned values are never drafted. This catches any drafts we created, too.
      if (value !== peek(state.base_, prop)) return value; // Store drafts on the copy (when one exists).
      // @ts-ignore

      drafts = state.copy_;
    }

    return drafts[prop] = createProxy(state.scope_.immer_, value, state);
  },
  has: function has(state, prop) {
    return prop in latest(state);
  },
  ownKeys: function ownKeys(state) {
    return Reflect.ownKeys(latest(state));
  },
  set: function set(state, prop
  /* strictly not, but helps TS */
  , value) {
    if (!state.modified_) {
      var baseValue = peek(state.base_, prop); // Optimize based on value's truthiness. Truthy values are guaranteed to
      // never be undefined, so we can avoid the `in` operator. Lastly, truthy
      // values may be drafts, but falsy values are never drafts.

      var isUnchanged = value ? is(baseValue, value) || value === state.drafts_[prop] : is(baseValue, value) && prop in state.base_;
      if (isUnchanged) return true;
      prepareCopy(state);
      markChangedProxy(state);
    }

    state.assigned_[prop] = true; // @ts-ignore

    state.copy_[prop] = value;
    return true;
  },
  deleteProperty: function deleteProperty(state, prop) {
    // The `undefined` check is a fast path for pre-existing keys.
    if (peek(state.base_, prop) !== undefined || prop in state.base_) {
      state.assigned_[prop] = false;
      prepareCopy(state);
      markChangedProxy(state);
    } else if (state.assigned_[prop]) {
      // if an originally not assigned property was deleted
      delete state.assigned_[prop];
    } // @ts-ignore


    if (state.copy_) delete state.copy_[prop];
    return true;
  },
  // Note: We never coerce `desc.value` into an Immer draft, because we can't make
  // the same guarantee in ES5 mode.
  getOwnPropertyDescriptor: function getOwnPropertyDescriptor(state, prop) {
    var owner = latest(state);
    var desc = Reflect.getOwnPropertyDescriptor(owner, prop);

    if (desc) {
      desc.writable = true;
      desc.configurable = state.type_ !== ProxyTypeProxyArray || prop !== "length";
    }

    return desc;
  },
  defineProperty: function defineProperty() {
    die(11);
  },
  getPrototypeOf: function getPrototypeOf(state) {
    return Object.getPrototypeOf(state.base_);
  },
  setPrototypeOf: function setPrototypeOf() {
    die(12);
  }
};
/**
 * Array drafts
 */

var arrayTraps = {};
each(objectTraps, function (key, fn) {
  // @ts-ignore
  arrayTraps[key] = function () {
    arguments[0] = arguments[0][0];
    return fn.apply(this, arguments);
  };
});

arrayTraps.deleteProperty = function (state, prop) {
  if ( isNaN(parseInt(prop))) die(13);
  return objectTraps.deleteProperty.call(this, state[0], prop);
};

arrayTraps.set = function (state, prop, value) {
  if ( prop !== "length" && isNaN(parseInt(prop))) die(14);
  return objectTraps.set.call(this, state[0], prop, value, state[0]);
};
/**
 * Map drafts
 */
// Access a property without creating an Immer draft.


function peek(draft, prop) {
  var state = draft[DRAFT_STATE];
  var desc = Reflect.getOwnPropertyDescriptor(state ? latest(state) : draft, prop);
  return desc && desc.value;
}

function markChangedProxy(state) {
  if (!state.modified_) {
    state.modified_ = true;

    if (state.type_ === ProxyTypeProxyObject || state.type_ === ProxyTypeProxyArray) {
      var copy = state.copy_ = shallowCopy(state.base_);
      each(state.drafts_, function (key, value) {
        // @ts-ignore
        copy[key] = value;
      });
      state.drafts_ = undefined;
    }

    if (state.parent_) {
      markChangedProxy(state.parent_);
    }
  }
}

function prepareCopy(state) {
  if (!state.copy_) {
    state.copy_ = shallowCopy(state.base_);
  }
}

var Immer =
/*#__PURE__*/
function () {
  function Immer(config) {
    this.useProxies_ = hasProxies;
    this.autoFreeze_ =  true
    /* istanbul ignore next */
    ;
    if (typeof (config === null || config === void 0 ? void 0 : config.useProxies) === "boolean") this.setUseProxies(config.useProxies);
    if (typeof (config === null || config === void 0 ? void 0 : config.autoFreeze) === "boolean") this.setAutoFreeze(config.autoFreeze);
    this.produce = this.produce.bind(this);
    this.produceWithPatches = this.produceWithPatches.bind(this);
  }
  /**
   * The `produce` function takes a value and a "recipe function" (whose
   * return value often depends on the base state). The recipe function is
   * free to mutate its first argument however it wants. All mutations are
   * only ever applied to a __copy__ of the base state.
   *
   * Pass only a function to create a "curried producer" which relieves you
   * from passing the recipe function every time.
   *
   * Only plain objects and arrays are made mutable. All other objects are
   * considered uncopyable.
   *
   * Note: This function is __bound__ to its `Immer` instance.
   *
   * @param {any} base - the initial state
   * @param {Function} producer - function that receives a proxy of the base state as first argument and which can be freely modified
   * @param {Function} patchListener - optional function that will be called with all the patches produced here
   * @returns {any} a new state, or the initial state if nothing was modified
   */


  var _proto = Immer.prototype;

  _proto.produce = function produce(base, recipe, patchListener) {
    // curried invocation
    if (typeof base === "function" && typeof recipe !== "function") {
      var defaultBase = recipe;
      recipe = base;
      var self = this;
      return function curriedProduce(base) {
        var _this = this;

        if (base === void 0) {
          base = defaultBase;
        }

        for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
          args[_key - 1] = arguments[_key];
        }

        return self.produce(base, function (draft) {
          var _recipe;

          return (_recipe = recipe).call.apply(_recipe, [_this, draft].concat(args));
        }); // prettier-ignore
      };
    }

    if (typeof recipe !== "function") die(6);
    if (patchListener !== undefined && typeof patchListener !== "function") die(7);
    var result; // Only plain objects, arrays, and "immerable classes" are drafted.

    if (isDraftable(base)) {
      var scope = enterScope(this);
      var proxy = createProxy(this, base, undefined);
      var hasError = true;

      try {
        result = recipe(proxy);
        hasError = false;
      } finally {
        // finally instead of catch + rethrow better preserves original stack
        if (hasError) revokeScope(scope);else leaveScope(scope);
      }

      if (typeof Promise !== "undefined" && result instanceof Promise) {
        return result.then(function (result) {
          usePatchesInScope(scope, patchListener);
          return processResult(result, scope);
        }, function (error) {
          revokeScope(scope);
          throw error;
        });
      }

      usePatchesInScope(scope, patchListener);
      return processResult(result, scope);
    } else {
      result = recipe(base);
      if (result === NOTHING) return undefined;
      if (result === undefined) result = base;
      if (this.autoFreeze_) freeze(result, true);
      return result;
    }
  };

  _proto.produceWithPatches = function produceWithPatches(arg1, arg2, arg3) {
    var _this2 = this;

    if (typeof arg1 === "function") {
      return function (state) {
        for (var _len2 = arguments.length, args = new Array(_len2 > 1 ? _len2 - 1 : 0), _key2 = 1; _key2 < _len2; _key2++) {
          args[_key2 - 1] = arguments[_key2];
        }

        return _this2.produceWithPatches(state, function (draft) {
          return arg1.apply(void 0, [draft].concat(args));
        });
      };
    }

    var patches, inversePatches;
    var nextState = this.produce(arg1, arg2, function (p, ip) {
      patches = p;
      inversePatches = ip;
    });
    return [nextState, patches, inversePatches];
  };

  _proto.createDraft = function createDraft(base) {
    if (!isDraftable(base)) die(8);
    var scope = enterScope(this);
    var proxy = createProxy(this, base, undefined);
    proxy[DRAFT_STATE].isManual_ = true;
    leaveScope(scope);
    return proxy;
  };

  _proto.finishDraft = function finishDraft(draft, patchListener) {
    var state = draft && draft[DRAFT_STATE];

    {
      if (!state || !state.isManual_) die(9);
      if (state.finalized_) die(10);
    }

    var scope = state.scope_;
    usePatchesInScope(scope, patchListener);
    return processResult(undefined, scope);
  }
  /**
   * Pass true to automatically freeze all copies created by Immer.
   *
   * By default, auto-freezing is disabled in production.
   */
  ;

  _proto.setAutoFreeze = function setAutoFreeze(value) {
    this.autoFreeze_ = value;
  }
  /**
   * Pass true to use the ES2015 `Proxy` class when creating drafts, which is
   * always faster than using ES5 proxies.
   *
   * By default, feature detection is used, so calling this is rarely necessary.
   */
  ;

  _proto.setUseProxies = function setUseProxies(value) {
    if (!hasProxies) {
      die(20);
    }

    this.useProxies_ = value;
  };

  _proto.applyPatches = function applyPatches(base, patches) {
    // If a patch replaces the entire state, take that replacement as base
    // before applying patches
    var i;

    for (i = patches.length - 1; i >= 0; i--) {
      var patch = patches[i];

      if (patch.path.length === 0 && patch.op === "replace") {
        base = patch.value;
        break;
      }
    }

    var applyPatchesImpl = getPlugin("Patches").applyPatches_;

    if (isDraft(base)) {
      // N.B: never hits if some patch a replacement, patches are never drafts
      return applyPatchesImpl(base, patches);
    } // Otherwise, produce a copy of the base state.


    return this.produce(base, function (draft) {
      return applyPatchesImpl(draft, patches.slice(i + 1));
    });
  };

  return Immer;
}();
function createProxy(immer, value, parent) {
  // precondition: createProxy should be guarded by isDraftable, so we know we can safely draft
  var draft = isMap(value) ? getPlugin("MapSet").proxyMap_(value, parent) : isSet(value) ? getPlugin("MapSet").proxySet_(value, parent) : immer.useProxies_ ? createProxyProxy(value, parent) : getPlugin("ES5").createES5Proxy_(value, parent);
  var scope = parent ? parent.scope_ : getCurrentScope();
  scope.drafts_.push(draft);
  return draft;
}
function markChanged(immer, state) {
  if (immer.useProxies_) {
    markChangedProxy(state);
  } else {
    getPlugin("ES5").markChangedES5_(state);
  }
}

function enableES5() {
  function willFinalizeES5_(scope, result, isReplaced) {
    scope.drafts_.forEach(function (draft) {
      draft[DRAFT_STATE].finalizing_ = true;
    });

    if (!isReplaced) {
      if (scope.patches_) {
        markChangesRecursively(scope.drafts_[0]);
      } // This is faster when we don't care about which attributes changed.


      markChangesSweep(scope.drafts_);
    } // When a child draft is returned, look for changes.
    else if (isDraft(result) && result[DRAFT_STATE].scope_ === scope) {
        markChangesSweep(scope.drafts_);
      }
  }

  function createES5Proxy_(base, parent) {
    var isArray = Array.isArray(base);
    var draft = clonePotentialDraft(base);
    each(draft, function (prop) {
      proxyProperty(draft, prop, isArray || isEnumerable(base, prop));
    });
    var state = {
      type_: isArray ? ProxyTypeES5Array : ProxyTypeES5Object,
      scope_: parent ? parent.scope_ : getCurrentScope(),
      modified_: false,
      finalizing_: false,
      finalized_: false,
      assigned_: {},
      parent_: parent,
      base_: base,
      draft_: draft,
      copy_: null,
      revoked_: false,
      isManual_: false
    };
    Object.defineProperty(draft, DRAFT_STATE, {
      value: state,
      // enumerable: false <- the default
      writable: true
    });
    return draft;
  } // Access a property without creating an Immer draft.


  function peek(draft, prop) {
    var state = draft[DRAFT_STATE];

    if (state && !state.finalizing_) {
      state.finalizing_ = true;
      var value = draft[prop];
      state.finalizing_ = false;
      return value;
    }

    return draft[prop];
  }

  function _get(state, prop) {
    assertUnrevoked(state);
    var value = peek(latest(state), prop);
    if (state.finalizing_) return value; // Create a draft if the value is unmodified.

    if (value === peek(state.base_, prop) && isDraftable(value)) {
      prepareCopy(state); // @ts-ignore

      return state.copy_[prop] = createProxy(state.scope_.immer_, value, state);
    }

    return value;
  }

  function _set(state, prop, value) {
    assertUnrevoked(state);
    state.assigned_[prop] = true;

    if (!state.modified_) {
      if (is(value, peek(latest(state), prop))) return;
      markChangedES5_(state);
      prepareCopy(state);
    } // @ts-ignore


    state.copy_[prop] = value;
  }

  function markChangedES5_(state) {
    if (!state.modified_) {
      state.modified_ = true;
      if (state.parent_) markChangedES5_(state.parent_);
    }
  }

  function prepareCopy(state) {
    if (!state.copy_) state.copy_ = clonePotentialDraft(state.base_);
  }

  function clonePotentialDraft(base) {
    var state = base && base[DRAFT_STATE];

    if (state) {
      state.finalizing_ = true;
      var draft = shallowCopy(state.draft_, true);
      state.finalizing_ = false;
      return draft;
    }

    return shallowCopy(base);
  } // property descriptors are recycled to make sure we don't create a get and set closure per property,
  // but share them all instead


  var descriptors = {};

  function proxyProperty(draft, prop, enumerable) {
    var desc = descriptors[prop];

    if (desc) {
      desc.enumerable = enumerable;
    } else {
      descriptors[prop] = desc = {
        // configurable: true,
        enumerable: enumerable,
        get: function get() {
          return _get(this[DRAFT_STATE], prop);
        },
        set: function set(value) {
          _set(this[DRAFT_STATE], prop, value);
        }
      };
    }

    Object.defineProperty(draft, prop, desc);
  } // This looks expensive, but only proxies are visited, and only objects without known changes are scanned.


  function markChangesSweep(drafts) {
    // The natural order of drafts in the `scope` array is based on when they
    // were accessed. By processing drafts in reverse natural order, we have a
    // better chance of processing leaf nodes first. When a leaf node is known to
    // have changed, we can avoid any traversal of its ancestor nodes.
    for (var i = drafts.length - 1; i >= 0; i--) {
      var state = drafts[i][DRAFT_STATE];

      if (!state.modified_) {
        switch (state.type_) {
          case ProxyTypeES5Array:
            if (hasArrayChanges(state)) markChangedES5_(state);
            break;

          case ProxyTypeES5Object:
            if (hasObjectChanges(state)) markChangedES5_(state);
            break;
        }
      }
    }
  }

  function markChangesRecursively(object) {
    if (!object || typeof object !== "object") return;
    var state = object[DRAFT_STATE];
    if (!state) return;
    var base_ = state.base_,
        draft_ = state.draft_,
        assigned_ = state.assigned_,
        type_ = state.type_;

    if (type_ === ProxyTypeES5Object) {
      // Look for added keys.
      // TODO: looks quite duplicate to hasObjectChanges,
      // probably there is a faster way to detect changes, as sweep + recurse seems to do some
      // unnecessary work.
      // also: probably we can store the information we detect here, to speed up tree finalization!
      each(draft_, function (key) {
        if (key === DRAFT_STATE) return; // The `undefined` check is a fast path for pre-existing keys.

        if (base_[key] === undefined && !has(base_, key)) {
          assigned_[key] = true;
          markChangedES5_(state);
        } else if (!assigned_[key]) {
          // Only untouched properties trigger recursion.
          markChangesRecursively(draft_[key]);
        }
      }); // Look for removed keys.

      each(base_, function (key) {
        // The `undefined` check is a fast path for pre-existing keys.
        if (draft_[key] === undefined && !has(draft_, key)) {
          assigned_[key] = false;
          markChangedES5_(state);
        }
      });
    } else if (type_ === ProxyTypeES5Array) {
      if (hasArrayChanges(state)) {
        markChangedES5_(state);
        assigned_.length = true;
      }

      if (draft_.length < base_.length) {
        for (var i = draft_.length; i < base_.length; i++) {
          assigned_[i] = false;
        }
      } else {
        for (var _i = base_.length; _i < draft_.length; _i++) {
          assigned_[_i] = true;
        }
      } // Minimum count is enough, the other parts has been processed.


      var min = Math.min(draft_.length, base_.length);

      for (var _i2 = 0; _i2 < min; _i2++) {
        // Only untouched indices trigger recursion.
        if (assigned_[_i2] === undefined) markChangesRecursively(draft_[_i2]);
      }
    }
  }

  function hasObjectChanges(state) {
    var base_ = state.base_,
        draft_ = state.draft_; // Search for added keys and changed keys. Start at the back, because
    // non-numeric keys are ordered by time of definition on the object.

    var keys = Object.keys(draft_);

    for (var i = keys.length - 1; i >= 0; i--) {
      var key = keys[i];
      var baseValue = base_[key]; // The `undefined` check is a fast path for pre-existing keys.

      if (baseValue === undefined && !has(base_, key)) {
        return true;
      } // Once a base key is deleted, future changes go undetected, because its
      // descriptor is erased. This branch detects any missed changes.
      else {
          var value = draft_[key];

          var _state = value && value[DRAFT_STATE];

          if (_state ? _state.base_ !== baseValue : !is(value, baseValue)) {
            return true;
          }
        }
    } // At this point, no keys were added or changed.
    // Compare key count to determine if keys were deleted.


    return keys.length !== Object.keys(base_).length;
  }

  function hasArrayChanges(state) {
    var draft_ = state.draft_;
    if (draft_.length !== state.base_.length) return true; // See #116
    // If we first shorten the length, our array interceptors will be removed.
    // If after that new items are added, result in the same original length,
    // those last items will have no intercepting property.
    // So if there is no own descriptor on the last position, we know that items were removed and added
    // N.B.: splice, unshift, etc only shift values around, but not prop descriptors, so we only have to check
    // the last one

    var descriptor = Object.getOwnPropertyDescriptor(draft_, draft_.length - 1); // descriptor can be null, but only for newly created sparse arrays, eg. new Array(10)

    if (descriptor && !descriptor.get) return true; // For all other cases, we don't have to compare, as they would have been picked up by the index setters

    return false;
  }
  /*#__PURE__*/


  function isEnumerable(base, prop) {
    var desc = Object.getOwnPropertyDescriptor(base, prop);
    return desc && desc.enumerable ? true : false;
  }

  function assertUnrevoked(state
  /*ES5State | MapState | SetState*/
  ) {
    if (state.revoked_) die(3, JSON.stringify(latest(state)));
  }

  loadPlugin("ES5", {
    createES5Proxy_: createES5Proxy_,
    markChangedES5_: markChangedES5_,
    willFinalizeES5_: willFinalizeES5_
  });
}

function enablePatches() {
  var REPLACE = "replace";
  var ADD = "add";
  var REMOVE = "remove";

  function generatePatches_(state, basePath, patches, inversePatches) {
    switch (state.type_) {
      case ProxyTypeProxyObject:
      case ProxyTypeES5Object:
      case ProxyTypeMap:
        return generatePatchesFromAssigned(state, basePath, patches, inversePatches);

      case ProxyTypeES5Array:
      case ProxyTypeProxyArray:
        return generateArrayPatches(state, basePath, patches, inversePatches);

      case ProxyTypeSet:
        return generateSetPatches(state, basePath, patches, inversePatches);
    }
  }

  function generateArrayPatches(state, basePath, patches, inversePatches) {
    var base_ = state.base_,
        assigned_ = state.assigned_;
    var copy_ = state.copy_; // Reduce complexity by ensuring `base` is never longer.

    if (copy_.length < base_.length) {
      var _ref = [copy_, base_];
      base_ = _ref[0];
      copy_ = _ref[1];
      var _ref2 = [inversePatches, patches];
      patches = _ref2[0];
      inversePatches = _ref2[1];
    }

    var delta = copy_.length - base_.length; // Find the first replaced index.

    var start = 0;

    while (base_[start] === copy_[start] && start < base_.length) {
      ++start;
    } // Find the last replaced index. Search from the end to optimize splice patches.


    var end = base_.length;

    while (end > start && base_[end - 1] === copy_[end + delta - 1]) {
      --end;
    } // Process replaced indices.


    for (var i = start; i < end; ++i) {
      if (assigned_[i] && copy_[i] !== base_[i]) {
        var path = basePath.concat([i]);
        patches.push({
          op: REPLACE,
          path: path,
          value: copy_[i]
        });
        inversePatches.push({
          op: REPLACE,
          path: path,
          value: base_[i]
        });
      }
    }

    var replaceCount = patches.length; // Process added indices.

    for (var _i = end + delta - 1; _i >= end; --_i) {
      var _path = basePath.concat([_i]);

      patches[replaceCount + _i - end] = {
        op: ADD,
        path: _path,
        value: copy_[_i]
      };
      inversePatches.push({
        op: REMOVE,
        path: _path
      });
    }
  } // This is used for both Map objects and normal objects.


  function generatePatchesFromAssigned(state, basePath, patches, inversePatches) {
    var base_ = state.base_,
        copy_ = state.copy_;
    each(state.assigned_, function (key, assignedValue) {
      var origValue = get(base_, key);
      var value = get(copy_, key);
      var op = !assignedValue ? REMOVE : has(base_, key) ? REPLACE : ADD;
      if (origValue === value && op === REPLACE) return;
      var path = basePath.concat(key);
      patches.push(op === REMOVE ? {
        op: op,
        path: path
      } : {
        op: op,
        path: path,
        value: value
      });
      inversePatches.push(op === ADD ? {
        op: REMOVE,
        path: path
      } : op === REMOVE ? {
        op: ADD,
        path: path,
        value: origValue
      } : {
        op: REPLACE,
        path: path,
        value: origValue
      });
    });
  }

  function generateSetPatches(state, basePath, patches, inversePatches) {
    var base_ = state.base_,
        copy_ = state.copy_;
    var i = 0;
    base_.forEach(function (value) {
      if (!copy_.has(value)) {
        var path = basePath.concat([i]);
        patches.push({
          op: REMOVE,
          path: path,
          value: value
        });
        inversePatches.unshift({
          op: ADD,
          path: path,
          value: value
        });
      }

      i++;
    });
    i = 0;
    copy_.forEach(function (value) {
      if (!base_.has(value)) {
        var path = basePath.concat([i]);
        patches.push({
          op: ADD,
          path: path,
          value: value
        });
        inversePatches.unshift({
          op: REMOVE,
          path: path,
          value: value
        });
      }

      i++;
    });
  }

  function generateReplacementPatches_(rootState, replacement, patches, inversePatches) {
    patches.push({
      op: REPLACE,
      path: [],
      value: replacement
    });
    inversePatches.push({
      op: REPLACE,
      path: [],
      value: rootState.base_
    });
  }

  function applyPatches_(draft, patches) {
    patches.forEach(function (patch) {
      var path = patch.path,
          op = patch.op;
      var base = draft;

      for (var i = 0; i < path.length - 1; i++) {
        base = get(base, path[i]);
        if (typeof base !== "object") die(15, path.join("/"));
      }

      var type = getArchtype(base);
      var value = deepClonePatchValue(patch.value); // used to clone patch to ensure original patch is not modified, see #411

      var key = path[path.length - 1];

      switch (op) {
        case REPLACE:
          switch (type) {
            case ArchtypeMap:
              return base.set(key, value);

            /* istanbul ignore next */

            case ArchtypeSet:
              die(16);

            default:
              // if value is an object, then it's assigned by reference
              // in the following add or remove ops, the value field inside the patch will also be modifyed
              // so we use value from the cloned patch
              // @ts-ignore
              return base[key] = value;
          }

        case ADD:
          switch (type) {
            case ArchtypeArray:
              return base.splice(key, 0, value);

            case ArchtypeMap:
              return base.set(key, value);

            case ArchtypeSet:
              return base.add(value);

            default:
              return base[key] = value;
          }

        case REMOVE:
          switch (type) {
            case ArchtypeArray:
              return base.splice(key, 1);

            case ArchtypeMap:
              return base.delete(key);

            case ArchtypeSet:
              return base.delete(patch.value);

            default:
              return delete base[key];
          }

        default:
          die(17, op);
      }
    });
    return draft;
  }

  function deepClonePatchValue(obj) {
    if (!obj || typeof obj !== "object") return obj;
    if (Array.isArray(obj)) return obj.map(deepClonePatchValue);
    if (isMap(obj)) return new Map(Array.from(obj.entries()).map(function (_ref3) {
      var k = _ref3[0],
          v = _ref3[1];
      return [k, deepClonePatchValue(v)];
    }));
    if (isSet(obj)) return new Set(Array.from(obj).map(deepClonePatchValue));
    var cloned = Object.create(Object.getPrototypeOf(obj));

    for (var key in obj) {
      cloned[key] = deepClonePatchValue(obj[key]);
    }

    return cloned;
  }

  loadPlugin("Patches", {
    applyPatches_: applyPatches_,
    generatePatches_: generatePatches_,
    generateReplacementPatches_: generateReplacementPatches_
  });
}

// types only!
function enableMapSet() {
  /* istanbul ignore next */
  var _extendStatics = function extendStatics(d, b) {
    _extendStatics = Object.setPrototypeOf || {
      __proto__: []
    } instanceof Array && function (d, b) {
      d.__proto__ = b;
    } || function (d, b) {
      for (var p in b) {
        if (b.hasOwnProperty(p)) d[p] = b[p];
      }
    };

    return _extendStatics(d, b);
  }; // Ugly hack to resolve #502 and inherit built in Map / Set


  function __extends(d, b) {
    _extendStatics(d, b);

    function __() {
      this.constructor = d;
    }

    d.prototype = ( // @ts-ignore
    __.prototype = b.prototype, new __());
  }

  var DraftMap = function (_super) {
    __extends(DraftMap, _super); // Create class manually, cause #502


    function DraftMap(target, parent) {
      this[DRAFT_STATE] = {
        type_: ProxyTypeMap,
        parent_: parent,
        scope_: parent ? parent.scope_ : getCurrentScope(),
        modified_: false,
        finalized_: false,
        copy_: undefined,
        assigned_: undefined,
        base_: target,
        draft_: this,
        isManual_: false,
        revoked_: false
      };
      return this;
    }

    var p = DraftMap.prototype;
    Object.defineProperty(p, "size", {
      get: function get() {
        return latest(this[DRAFT_STATE]).size;
      } // enumerable: false,
      // configurable: true

    });

    p.has = function (key) {
      return latest(this[DRAFT_STATE]).has(key);
    };

    p.set = function (key, value) {
      var state = this[DRAFT_STATE];
      assertUnrevoked(state);

      if (latest(state).get(key) !== value) {
        prepareMapCopy(state);
        markChanged(state.scope_.immer_, state);
        state.assigned_.set(key, true);
        state.copy_.set(key, value);
        state.assigned_.set(key, true);
      }

      return this;
    };

    p.delete = function (key) {
      if (!this.has(key)) {
        return false;
      }

      var state = this[DRAFT_STATE];
      assertUnrevoked(state);
      prepareMapCopy(state);
      markChanged(state.scope_.immer_, state);
      state.assigned_.set(key, false);
      state.copy_.delete(key);
      return true;
    };

    p.clear = function () {
      var state = this[DRAFT_STATE];
      assertUnrevoked(state);
      prepareMapCopy(state);
      markChanged(state.scope_.immer_, state);
      state.assigned_ = new Map();
      return state.copy_.clear();
    };

    p.forEach = function (cb, thisArg) {
      var _this = this;

      var state = this[DRAFT_STATE];
      latest(state).forEach(function (_value, key, _map) {
        cb.call(thisArg, _this.get(key), key, _this);
      });
    };

    p.get = function (key) {
      var state = this[DRAFT_STATE];
      assertUnrevoked(state);
      var value = latest(state).get(key);

      if (state.finalized_ || !isDraftable(value)) {
        return value;
      }

      if (value !== state.base_.get(key)) {
        return value; // either already drafted or reassigned
      } // despite what it looks, this creates a draft only once, see above condition


      var draft = createProxy(state.scope_.immer_, value, state);
      prepareMapCopy(state);
      state.copy_.set(key, draft);
      return draft;
    };

    p.keys = function () {
      return latest(this[DRAFT_STATE]).keys();
    };

    p.values = function () {
      var _this2 = this,
          _ref;

      var iterator = this.keys();
      return _ref = {}, _ref[iteratorSymbol] = function () {
        return _this2.values();
      }, _ref.next = function next() {
        var r = iterator.next();
        /* istanbul ignore next */

        if (r.done) return r;

        var value = _this2.get(r.value);

        return {
          done: false,
          value: value
        };
      }, _ref;
    };

    p.entries = function () {
      var _this3 = this,
          _ref2;

      var iterator = this.keys();
      return _ref2 = {}, _ref2[iteratorSymbol] = function () {
        return _this3.entries();
      }, _ref2.next = function next() {
        var r = iterator.next();
        /* istanbul ignore next */

        if (r.done) return r;

        var value = _this3.get(r.value);

        return {
          done: false,
          value: [r.value, value]
        };
      }, _ref2;
    };

    p[iteratorSymbol] = function () {
      return this.entries();
    };

    return DraftMap;
  }(Map);

  function proxyMap_(target, parent) {
    // @ts-ignore
    return new DraftMap(target, parent);
  }

  function prepareMapCopy(state) {
    if (!state.copy_) {
      state.assigned_ = new Map();
      state.copy_ = new Map(state.base_);
    }
  }

  var DraftSet = function (_super) {
    __extends(DraftSet, _super); // Create class manually, cause #502


    function DraftSet(target, parent) {
      this[DRAFT_STATE] = {
        type_: ProxyTypeSet,
        parent_: parent,
        scope_: parent ? parent.scope_ : getCurrentScope(),
        modified_: false,
        finalized_: false,
        copy_: undefined,
        base_: target,
        draft_: this,
        drafts_: new Map(),
        revoked_: false,
        isManual_: false
      };
      return this;
    }

    var p = DraftSet.prototype;
    Object.defineProperty(p, "size", {
      get: function get() {
        return latest(this[DRAFT_STATE]).size;
      } // enumerable: true,

    });

    p.has = function (value) {
      var state = this[DRAFT_STATE];
      assertUnrevoked(state); // bit of trickery here, to be able to recognize both the value, and the draft of its value

      if (!state.copy_) {
        return state.base_.has(value);
      }

      if (state.copy_.has(value)) return true;
      if (state.drafts_.has(value) && state.copy_.has(state.drafts_.get(value))) return true;
      return false;
    };

    p.add = function (value) {
      var state = this[DRAFT_STATE];
      assertUnrevoked(state);

      if (state.copy_) {
        state.copy_.add(value);
      } else if (!state.base_.has(value)) {
        prepareSetCopy(state);
        markChanged(state.scope_.immer_, state);
        state.copy_.add(value);
      }

      return this;
    };

    p.delete = function (value) {
      if (!this.has(value)) {
        return false;
      }

      var state = this[DRAFT_STATE];
      assertUnrevoked(state);
      prepareSetCopy(state);
      markChanged(state.scope_.immer_, state);
      return state.copy_.delete(value) || (state.drafts_.has(value) ? state.copy_.delete(state.drafts_.get(value)) :
      /* istanbul ignore next */
      false);
    };

    p.clear = function () {
      var state = this[DRAFT_STATE];
      assertUnrevoked(state);
      prepareSetCopy(state);
      markChanged(state.scope_.immer_, state);
      return state.copy_.clear();
    };

    p.values = function () {
      var state = this[DRAFT_STATE];
      assertUnrevoked(state);
      prepareSetCopy(state);
      return state.copy_.values();
    };

    p.entries = function entries() {
      var state = this[DRAFT_STATE];
      assertUnrevoked(state);
      prepareSetCopy(state);
      return state.copy_.entries();
    };

    p.keys = function () {
      return this.values();
    };

    p[iteratorSymbol] = function () {
      return this.values();
    };

    p.forEach = function forEach(cb, thisArg) {
      var iterator = this.values();
      var result = iterator.next();

      while (!result.done) {
        cb.call(thisArg, result.value, result.value, this);
        result = iterator.next();
      }
    };

    return DraftSet;
  }(Set);

  function proxySet_(target, parent) {
    // @ts-ignore
    return new DraftSet(target, parent);
  }

  function prepareSetCo