1/**
  2 * Copyright (c) 2014-present, Facebook, Inc.
  3 *
  4 * This source code is licensed under the MIT license found in the
  5 * LICENSE file in the root directory of this source tree.
  6 */
  7
  8var runtime = (function (exports) {
  9  "use strict";
 10
 11  var Op = Object.prototype;
 12  var hasOwn = Op.hasOwnProperty;
 13  var defineProperty = Object.defineProperty || function (obj, key, desc) { obj[key] = desc.value; };
 14  var undefined; // More compressible than void 0.
 15  var $Symbol = typeof Symbol === "function" ? Symbol : {};
 16  var iteratorSymbol = $Symbol.iterator || "@@iterator";
 17  var asyncIteratorSymbol = $Symbol.asyncIterator || "@@asyncIterator";
 18  var toStringTagSymbol = $Symbol.toStringTag || "@@toStringTag";
 19
 20  function define(obj, key, value) {
 21    Object.defineProperty(obj, key, {
 22      value: value,
 23      enumerable: true,
 24      configurable: true,
 25      writable: true
 26    });
 27    return obj[key];
 28  }
 29  try {
 30    // IE 8 has a broken Object.defineProperty that only works on DOM objects.
 31    define({}, "");
 32  } catch (err) {
 33    define = function(obj, key, value) {
 34      return obj[key] = value;
 35    };
 36  }
 37
 38  function wrap(innerFn, outerFn, self, tryLocsList) {
 39    // If outerFn provided and outerFn.prototype is a Generator, then outerFn.prototype instanceof Generator.
 40    var protoGenerator = outerFn && outerFn.prototype instanceof Generator ? outerFn : Generator;
 41    var generator = Object.create(protoGenerator.prototype);
 42    var context = new Context(tryLocsList || []);
 43
 44    // The ._invoke method unifies the implementations of the .next,
 45    // .throw, and .return methods.
 46    defineProperty(generator, "_invoke", { value: makeInvokeMethod(innerFn, self, context) });
 47
 48    return generator;
 49  }
 50  exports.wrap = wrap;
 51
 52  // Try/catch helper to minimize deoptimizations. Returns a completion
 53  // record like context.tryEntries[i].completion. This interface could
 54  // have been (and was previously) designed to take a closure to be
 55  // invoked without arguments, but in all the cases we care about we
 56  // already have an existing method we want to call, so there's no need
 57  // to create a new function object. We can even get away with assuming
 58  // the method takes exactly one argument, since that happens to be true
 59  // in every case, so we don't have to touch the arguments object. The
 60  // only additional allocation required is the completion record, which
 61  // has a stable shape and so hopefully should be cheap to allocate.
 62  function tryCatch(fn, obj, arg) {
 63    try {
 64      return { type: "normal", arg: fn.call(obj, arg) };
 65    } catch (err) {
 66      return { type: "throw", arg: err };
 67    }
 68  }
 69
 70  var GenStateSuspendedStart = "suspendedStart";
 71  var GenStateSuspendedYield = "suspendedYield";
 72  var GenStateExecuting = "executing";
 73  var GenStateCompleted = "completed";
 74
 75  // Returning this object from the innerFn has the same effect as
 76  // breaking out of the dispatch switch statement.
 77  var ContinueSentinel = {};
 78
 79  // Dummy constructor functions that we use as the .constructor and
 80  // .constructor.prototype properties for functions that return Generator
 81  // objects. For full spec compliance, you may wish to configure your
 82  // minifier not to mangle the names of these two functions.
 83  function Generator() {}
 84  function GeneratorFunction() {}
 85  function GeneratorFunctionPrototype() {}
 86
 87  // This is a polyfill for %IteratorPrototype% for environments that
 88  // don't natively support it.
 89  var IteratorPrototype = {};
 90  define(IteratorPrototype, iteratorSymbol, function () {
 91    return this;
 92  });
 93
 94  var getProto = Object.getPrototypeOf;
 95  var NativeIteratorPrototype = getProto && getProto(getProto(values([])));
 96  if (NativeIteratorPrototype &&
 97      NativeIteratorPrototype !== Op &&
 98      hasOwn.call(NativeIteratorPrototype, iteratorSymbol)) {
 99    // This environment has a native %IteratorPrototype%; use it instead
100    // of the polyfill.
101    IteratorPrototype = NativeIteratorPrototype;
102  }
103
104  var Gp = GeneratorFunctionPrototype.prototype =
105    Generator.prototype = Object.create(IteratorPrototype);
106  GeneratorFunction.prototype = GeneratorFunctionPrototype;
107  defineProperty(Gp, "constructor", { value: GeneratorFunctionPrototype, configurable: true });
108  defineProperty(
109    GeneratorFunctionPrototype,
110    "constructor",
111    { value: GeneratorFunction, configurable: true }
112  );
113  GeneratorFunction.displayName = define(
114    GeneratorFunctionPrototype,
115    toStringTagSymbol,
116    "GeneratorFunction"
117  );
118
119  // Helper for defining the .next, .throw, and .return methods of the
120  // Iterator interface in terms of a single ._invoke method.
121  function defineIteratorMethods(prototype) {
122    ["next", "throw", "return"].forEach(function(method) {
123      define(prototype, method, function(arg) {
124        return this._invoke(method, arg);
125      });
126    });
127  }
128
129  exports.isGeneratorFunction = function(genFun) {
130    var ctor = typeof genFun === "function" && genFun.constructor;
131    return ctor
132      ? ctor === GeneratorFunction ||
133        // For the native GeneratorFunction constructor, the best we can
134        // do is to check its .name property.
135        (ctor.displayName || ctor.name) === "GeneratorFunction"
136      : false;
137  };
138
139  exports.mark = function(genFun) {
140    if (Object.setPrototypeOf) {
141      Object.setPrototypeOf(genFun, GeneratorFunctionPrototype);
142    } else {
143      genFun.__proto__ = GeneratorFunctionPrototype;
144      define(genFun, toStringTagSymbol, "GeneratorFunction");
145    }
146    genFun.prototype = Object.create(Gp);
147    return genFun;
148  };
149
150  // Within the body of any async function, `await x` is transformed to
151  // `yield regeneratorRuntime.awrap(x)`, so that the runtime can test
152  // `hasOwn.call(value, "__await")` to determine if the yielded value is
153  // meant to be awaited.
154  exports.awrap = function(arg) {
155    return { __await: arg };
156  };
157
158  function AsyncIterator(generator, PromiseImpl) {
159    function invoke(method, arg, resolve, reject) {
160      var record = tryCatch(generator[method], generator, arg);
161      if (record.type === "throw") {
162        reject(record.arg);
163      } else {
164        var result = record.arg;
165        var value = result.value;
166        if (value &&
167            typeof value === "object" &&
168            hasOwn.call(value, "__await")) {
169          return PromiseImpl.resolve(value.__await).then(function(value) {
170            invoke("next", value, resolve, reject);
171          }, function(err) {
172            invoke("throw", err, resolve, reject);
173          });
174        }
175
176        return PromiseImpl.resolve(value).then(function(unwrapped) {
177          // When a yielded Promise is resolved, its final value becomes
178          // the .value of the Promise<{value,done}> result for the
179          // current iteration.
180          result.value = unwrapped;
181          resolve(result);
182        }, function(error) {
183          // If a rejected Promise was yielded, throw the rejection back
184          // into the async generator function so it can be handled there.
185          return invoke("throw", error, resolve, reject);
186        });
187      }
188    }
189
190    var previousPromise;
191
192    function enqueue(method, arg) {
193      function callInvokeWithMethodAndArg() {
194        return new PromiseImpl(function(resolve, reject) {
195          invoke(method, arg, resolve, reject);
196        });
197      }
198
199      return previousPromise =
200        // If enqueue has been called before, then we want to wait until
201        // all previous Promises have been resolved before calling invoke,
202        // so that results are always delivered in the correct order. If
203        // enqueue has not been called before, then it is important to
204        // call invoke immediately, without waiting on a callback to fire,
205        // so that the async generator function has the opportunity to do
206        // any necessary setup in a predictable way. This predictability
207        // is why the Promise constructor synchronously invokes its
208        // executor callback, and why async functions synchronously
209        // execute code before the first await. Since we implement simple
210        // async functions in terms of async generators, it is especially
211        // important to get this right, even though it requires care.
212        previousPromise ? previousPromise.then(
213          callInvokeWithMethodAndArg,
214          // Avoid propagating failures to Promises returned by later
215          // invocations of the iterator.
216          callInvokeWithMethodAndArg
217        ) : callInvokeWithMethodAndArg();
218    }
219
220    // Define the unified helper method that is used to implement .next,
221    // .throw, and .return (see defineIteratorMethods).
222    defineProperty(this, "_invoke", { value: enqueue });
223  }
224
225  defineIteratorMethods(AsyncIterator.prototype);
226  define(AsyncIterator.prototype, asyncIteratorSymbol, function () {
227    return this;
228  });
229  exports.AsyncIterator = AsyncIterator;
230
231  // Note that simple async functions are implemented on top of
232  // AsyncIterator objects; they just return a Promise for the value of
233  // the final result produced by the iterator.
234  exports.async = function(innerFn, outerFn, self, tryLocsList, PromiseImpl) {
235    if (PromiseImpl === void 0) PromiseImpl = Promise;
236
237    var iter = new AsyncIterator(
238      wrap(innerFn, outerFn, self, tryLocsList),
239      PromiseImpl
240    );
241
242    return exports.isGeneratorFunction(outerFn)
243      ? iter // If outerFn is a generator, return the full iterator.
244      : iter.next().then(function(result) {
245          return result.done ? result.value : iter.next();
246        });
247  };
248
249  function makeInvokeMethod(innerFn, self, context) {
250    var state = GenStateSuspendedStart;
251
252    return function invoke(method, arg) {
253      if (state === GenStateExecuting) {
254        throw new Error("Generator is already running");
255      }
256
257      if (state === GenStateCompleted) {
258        if (method === "throw") {
259          throw arg;
260        }
261
262        // Be forgiving, per GeneratorResume behavior specified since ES2015:
263        // ES2015 spec, step 3: https://262.ecma-international.org/6.0/#sec-generatorresume
264        // Latest spec, step 2: https://tc39.es/ecma262/#sec-generatorresume
265        return doneResult();
266      }
267
268      context.method = method;
269      context.arg = arg;
270
271      while (true) {
272        var delegate = context.delegate;
273        if (delegate) {
274          var delegateResult = maybeInvokeDelegate(delegate, context);
275          if (delegateResult) {
276            if (delegateResult === ContinueSentinel) continue;
277            return delegateResult;
278          }
279        }
280
281        if (context.method === "next") {
282          // Setting context._sent for legacy support of Babel's
283          // function.sent implementation.
284          context.sent = context._sent = context.arg;
285
286        } else if (context.method === "throw") {
287          if (state === GenStateSuspendedStart) {
288            state = GenStateCompleted;
289            throw context.arg;
290          }
291
292          context.dispatchException(context.arg);
293
294        } else if (context.method === "return") {
295          context.abrupt("return", context.arg);
296        }
297
298        state = GenStateExecuting;
299
300        var record = tryCatch(innerFn, self, context);
301        if (record.type === "normal") {
302          // If an exception is thrown from innerFn, we leave state ===
303          // GenStateExecuting and loop back for another invocation.
304          state = context.done
305            ? GenStateCompleted
306            : GenStateSuspendedYield;
307
308          if (record.arg === ContinueSentinel) {
309            continue;
310          }
311
312          return {
313            value: record.arg,
314            done: context.done
315          };
316
317        } else if (record.type === "throw") {
318          state = GenStateCompleted;
319          // Dispatch the exception by looping back around to the
320          // context.dispatchException(context.arg) call above.
321          context.method = "throw";
322          context.arg = record.arg;
323        }
324      }
325    };
326  }
327
328  // Call delegate.iterator[context.method](context.arg) and handle the
329  // result, either by returning a { value, done } result from the
330  // delegate iterator, or by modifying context.method and context.arg,
331  // setting context.delegate to null, and returning the ContinueSentinel.
332  function maybeInvokeDelegate(delegate, context) {
333    var methodName = context.method;
334    var method = delegate.iterator[methodName];
335    if (method === undefined) {
336      // A .throw or .return when the delegate iterator has no .throw
337      // method, or a missing .next method, always terminate the
338      // yield* loop.
339      context.delegate = null;
340
341      // Note: ["return"] must be used for ES3 parsing compatibility.
342      if (methodName === "throw" && delegate.iterator["return"]) {
343        // If the delegate iterator has a return method, give it a
344        // chance to clean up.
345        context.method = "return";
346        context.arg = undefined;
347        maybeInvokeDelegate(delegate, context);
348
349        if (context.method === "throw") {
350          // If maybeInvokeDelegate(context) changed context.method from
351          // "return" to "throw", let that override the TypeError below.
352          return ContinueSentinel;
353        }
354      }
355      if (methodName !== "return") {
356        context.method = "throw";
357        context.arg = new TypeError(
358          "The iterator does not provide a '" + methodName + "' method");
359      }
360
361      return ContinueSentinel;
362    }
363
364    var record = tryCatch(method, delegate.iterator, context.arg);
365
366    if (record.type === "throw") {
367      context.method = "throw";
368      context.arg = record.arg;
369      context.delegate = null;
370      return ContinueSentinel;
371    }
372
373    var info = record.arg;
374
375    if (! info) {
376      context.method = "throw";
377      context.arg = new TypeError("iterator result is not an object");
378      context.delegate = null;
379      return ContinueSentinel;
380    }
381
382    if (info.done) {
383      // Assign the result of the finished delegate to the temporary
384      // variable specified by delegate.resultName (see delegateYield).
385      context[delegate.resultName] = info.value;
386
387      // Resume execution at the desired location (see delegateYield).
388      context.next = delegate.nextLoc;
389
390      // If context.method was "throw" but the delegate handled the
391      // exception, let the outer generator proceed normally. If
392      // context.method was "next", forget context.arg since it has been
393      // "consumed" by the delegate iterator. If context.method was
394      // "return", allow the original .return call to continue in the
395      // outer generator.
396      if (context.method !== "return") {
397        context.method = "next";
398        context.arg = undefined;
399      }
400
401    } else {
402      // Re-yield the result returned by the delegate method.
403      return info;
404    }
405
406    // The delegate iterator is finished, so forget it and continue with
407    // the outer generator.
408    context.delegate = null;
409    return ContinueSentinel;
410  }
411
412  // Define Generator.prototype.{next,throw,return} in terms of the
413  // unified ._invoke helper method.
414  defineIteratorMethods(Gp);
415
416  define(Gp, toStringTagSymbol, "Generator");
417
418  // A Generator should always return itself as the iterator object when the
419  // @@iterator function is called on it. Some browsers' implementations of the
420  // iterator prototype chain incorrectly implement this, causing the Generator
421  // object to not be returned from this call. This ensures that doesn't happen.
422  // See https://github.com/facebook/regenerator/issues/274 for more details.
423  define(Gp, iteratorSymbol, function() {
424    return this;
425  });
426
427  define(Gp, "toString", function() {
428    return "[object Generator]";
429  });
430
431  function pushTryEntry(locs) {
432    var entry = { tryLoc: locs[0] };
433
434    if (1 in locs) {
435      entry.catchLoc = locs[1];
436    }
437
438    if (2 in locs) {
439      entry.finallyLoc = locs[2];
440      entry.afterLoc = locs[3];
441    }
442
443    this.tryEntries.push(entry);
444  }
445
446  function resetTryEntry(entry) {
447    var record = entry.completion || {};
448    record.type = "normal";
449    delete record.arg;
450    entry.completion = record;
451  }
452
453  function Context(tryLocsList) {
454    // The root entry object (effectively a try statement without a catch
455    // or a finally block) gives us a place to store values thrown from
456    // locations where there is no enclosing try statement.
457    this.tryEntries = [{ tryLoc: "root" }];
458    tryLocsList.forEach(pushTryEntry, this);
459    this.reset(true);
460  }
461
462  exports.keys = function(val) {
463    var object = Object(val);
464    var keys = [];
465    for (var key in object) {
466      keys.push(key);
467    }
468    keys.reverse();
469
470    // Rather than returning an object with a next method, we keep
471    // things simple and return the next function itself.
472    return function next() {
473      while (keys.length) {
474        var key = keys.pop();
475        if (key in object) {
476          next.value = key;
477          next.done = false;
478          return next;
479        }
480      }
481
482      // To avoid creating an additional object, we just hang the .value
483      // and .done properties off the next function object itself. This
484      // also ensures that the minifier will not anonymize the function.
485      next.done = true;
486      return next;
487    };
488  };
489
490  function values(iterable) {
491    if (iterable != null) {
492      var iteratorMethod = iterable[iteratorSymbol];
493      if (iteratorMethod) {
494        return iteratorMethod.call(iterable);
495      }
496
497      if (typeof iterable.next === "function") {
498        return iterable;
499      }
500
501      if (!isNaN(iterable.length)) {
502        var i = -1, next = function next() {
503          while (++i < iterable.length) {
504            if (hasOwn.call(iterable, i)) {
505              next.value = iterable[i];
506              next.done = false;
507              return next;
508            }
509          }
510
511          next.value = undefined;
512          next.done = true;
513
514          return next;
515        };
516
517        return next.next = next;
518      }
519    }
520
521    throw new TypeError(typeof iterable + " is not iterable");
522  }
523  exports.values = values;
524
525  function doneResult() {
526    return { value: undefined, done: true };
527  }
528
529  Context.prototype = {
530    constructor: Context,
531
532    reset: function(skipTempReset) {
533      this.prev = 0;
534      this.next = 0;
535      // Resetting context._sent for legacy support of Babel's
536      // function.sent implementation.
537      this.sent = this._sent = undefined;
538      this.done = false;
539      this.delegate = null;
540
541      this.method = "next";
542      this.arg = undefined;
543
544      this.tryEntries.forEach(resetTryEntry);
545
546      if (!skipTempReset) {
547        for (var name in this) {
548          // Not sure about the optimal order of these conditions:
549          if (name.charAt(0) === "t" &&
550              hasOwn.call(this, name) &&
551              !isNaN(+name.slice(1))) {
552            this[name] = undefined;
553          }
554        }
555      }
556    },
557
558    stop: function() {
559      this.done = true;
560
561      var rootEntry = this.tryEntries[0];
562      var rootRecord = rootEntry.completion;
563      if (rootRecord.type === "throw") {
564        throw rootRecord.arg;
565      }
566
567      return this.rval;
568    },
569
570    dispatchException: function(exception) {
571      if (this.done) {
572        throw exception;
573      }
574
575      var context = this;
576      function handle(loc, caught) {
577        record.type = "throw";
578        record.arg = exception;
579        context.next = loc;
580
581        if (caught) {
582          // If the dispatched exception was caught by a catch block,
583          // then let that catch block handle the exception normally.
584          context.method = "next";
585          context.arg = undefined;
586        }
587
588        return !! caught;
589      }
590
591      for (var i = this.tryEntries.length - 1; i >= 0; --i) {
592        var entry = this.tryEntries[i];
593        var record = entry.completion;
594
595        if (entry.tryLoc === "root") {
596          // Exception thrown outside of any try block that could handle
597          // it, so set the completion value of the entire function to
598          // throw the exception.
599          return handle("end");
600        }
601
602        if (entry.tryLoc <= this.prev) {
603          var hasCatch = hasOwn.call(entry, "catchLoc");
604          var hasFinally = hasOwn.call(entry, "finallyLoc");
605
606          if (hasCatch && hasFinally) {
607            if (this.prev < entry.catchLoc) {
608              return handle(entry.catchLoc, true);
609            } else if (this.prev < entry.finallyLoc) {
610              return handle(entry.finallyLoc);
611            }
612
613          } else if (hasCatch) {
614            if (this.prev < entry.catchLoc) {
615              return handle(entry.catchLoc, true);
616            }
617
618          } else if (hasFinally) {
619            if (this.prev < entry.finallyLoc) {
620              return handle(entry.finallyLoc);
621            }
622
623          } else {
624            throw new Error("try statement without catch or finally");
625          }
626        }
627      }
628    },
629
630    abrupt: function(type, arg) {
631      for (var i = this.tryEntries.length - 1; i >= 0; --i) {
632        var entry = this.tryEntries[i];
633        if (entry.tryLoc <= this.prev &&
634            hasOwn.call(entry, "finallyLoc") &&
635            this.prev < entry.finallyLoc) {
636          var finallyEntry = entry;
637          break;
638        }
639      }
640
641      if (finallyEntry &&
642          (type === "break" ||
643           type === "continue") &&
644          finallyEntry.tryLoc <= arg &&
645          arg <= finallyEntry.finallyLoc) {
646        // Ignore the finally entry if control is not jumping to a
647        // location outside the try/catch block.
648        finallyEntry = null;
649      }
650
651      var record = finallyEntry ? finallyEntry.completion : {};
652      record.type = type;
653      record.arg = arg;
654
655      if (finallyEntry) {
656        this.method = "next";
657        this.next = finallyEntry.finallyLoc;
658        return ContinueSentinel;
659      }
660
661      return this.complete(record);
662    },
663
664    complete: function(record, afterLoc) {
665      if (record.type === "throw") {
666        throw record.arg;
667      }
668
669      if (record.type === "break" ||
670          record.type === "continue") {
671        this.next = record.arg;
672      } else if (record.type === "return") {
673        this.rval = this.arg = record.arg;
674        this.method = "return";
675        this.next = "end";
676      } else if (record.type === "normal" && afterLoc) {
677        this.next = afterLoc;
678      }
679
680      return ContinueSentinel;
681    },
682
683    finish: function(finallyLoc) {
684      for (var i = this.tryEntries.length - 1; i >= 0; --i) {
685        var entry = this.tryEntries[i];
686        if (entry.finallyLoc === finallyLoc) {
687          this.complete(entry.completion, entry.afterLoc);
688          resetTryEntry(entry);
689          return ContinueSentinel;
690        }
691      }
692    },
693
694    "catch": function(tryLoc) {
695      for (var i = this.tryEntries.length - 1; i >= 0; --i) {
696        var entry = this.tryEntries[i];
697        if (entry.tryLoc === tryLoc) {
698          var record = entry.completion;
699          if (record.type === "throw") {
700            var thrown = record.arg;
701            resetTryEntry(entry);
702          }
703          return thrown;
704        }
705      }
706
707      // The context.catch method must only be called with a location
708      // argument that corresponds to a known catch block.
709      throw new Error("illegal catch attempt");
710    },
711
712    delegateYield: function(iterable, resultName, nextLoc) {
713      this.delegate = {
714        iterator: values(iterable),
715        resultName: resultName,
716        nextLoc: nextLoc
717      };
718
719      if (this.method === "next") {
720        // Deliberately forget the last sent value so that we don't
721        // accidentally pass it on to the delegate.
722        this.arg = undefined;
723      }
724
725      return ContinueSentinel;
726    }
727  };
728
729  // Regardless of whether this script is executing as a CommonJS module
730  // or not, return the runtime object so that we can declare the variable
731  // regeneratorRuntime in the outer scope, which allows this module to be
732  // injected easily by `bin/regenerator --include-runtime script.js`.
733  return exports;
734
735}(
736  // If this script is executing as a CommonJS module, use module.exports
737  // as the regeneratorRuntime namespace. Otherwise create a new empty
738  // object. Either way, the resulting object will be used to initialize
739  // the regeneratorRuntime variable at the top of this file.
740  typeof module === "object" ? module.exports : {}
741));
742
743try {
744  regeneratorRuntime = runtime;
745} catch (accidentalStrictMode) {
746  // This module should not be running in strict mode, so the above
747  // assignment should always work unless something is misconfigured. Just
748  // in case runtime.js accidentally runs in strict mode, in modern engines
749  // we can explicitly access globalThis. In older engines we can escape
750  // strict mode using a global Function call. This could conceivably fail
751  // if a Content Security Policy forbids using Function, but in that case
752  // the proper solution is to fix the accidental strict mode problem. If
753  // you've misconfigured your bundler to force strict mode and applied a
754  // CSP to forbid Function, and you're not willing to fix either of those
755  // problems, please detail your unique predicament in a GitHub issue.
756  if (typeof globalThis === "object") {
757    globalThis.regeneratorRuntime = runtime;
758  } else {
759    Function("r", "regeneratorRuntime = r")(runtime);
760  }
761}
762