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regenerator-runtime.js (24583B)

---

 /**
  * 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) {
   "use strict";
 
   var Op = Object.prototype;
   var hasOwn = Op.hasOwnProperty;
   var undefined; // 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 define(obj, key, value) {
     Object.defineProperty(obj, key, {
       value: value,
       enumerable: true,
       configurable: true,
       writable: true
     });
     return obj[key];
   }
   try {
     // IE 8 has a broken Object.defineProperty that only works on DOM objects.
     define({}, "");
   } catch (err) {
     define = function(obj, key, value) {
       return obj[key] = value;
     };
   }
 
   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;
   GeneratorFunction.displayName = define(
     GeneratorFunctionPrototype,
     toStringTagSymbol,
     "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) {
       define(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;
       define(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) {
       // 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;
           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;
       }
 
     } 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);
 
   define(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;
           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, 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;
       this.done = false;
       this.delegate = null;
 
       this.method = "next";
       this.arg = undefined;
 
       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;
           }
         }
       }
     },
 
     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;
         }
 
         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;
       }
 
       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.
   typeof module === "object" ? 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);
 }