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node_modules/core-js/internals/iterate.js

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+'use strict';
+var bind = require('../internals/function-bind-context');
+var call = require('../internals/function-call');
+var anObject = require('../internals/an-object');
+var tryToString = require('../internals/try-to-string');
+var isArrayIteratorMethod = require('../internals/is-array-iterator-method');
+var lengthOfArrayLike = require('../internals/length-of-array-like');
+var isPrototypeOf = require('../internals/object-is-prototype-of');
+var getIterator = require('../internals/get-iterator');
+var getIteratorMethod = require('../internals/get-iterator-method');
+var iteratorClose = require('../internals/iterator-close');
+
+var $TypeError = TypeError;
+
+var Result = function (stopped, result) {
+  this.stopped = stopped;
+  this.result = result;
+};
+
+var ResultPrototype = Result.prototype;
+
+module.exports = function (iterable, unboundFunction, options) {
+  var that = options && options.that;
+  var AS_ENTRIES = !!(options && options.AS_ENTRIES);
+  var IS_RECORD = !!(options && options.IS_RECORD);
+  var IS_ITERATOR = !!(options && options.IS_ITERATOR);
+  var INTERRUPTED = !!(options && options.INTERRUPTED);
+  var fn = bind(unboundFunction, that);
+  var iterator, iterFn, index, length, result, next, step;
+
+  var stop = function (condition) {
+    if (iterator) iteratorClose(iterator, 'normal', condition);
+    return new Result(true, condition);
+  };
+
+  var callFn = function (value) {
+    if (AS_ENTRIES) {
+      anObject(value);
+      return INTERRUPTED ? fn(value[0], value[1], stop) : fn(value[0], value[1]);
+    } return INTERRUPTED ? fn(value, stop) : fn(value);
+  };
+
+  if (IS_RECORD) {
+    iterator = iterable.iterator;
+  } else if (IS_ITERATOR) {
+    iterator = iterable;
+  } else {
+    iterFn = getIteratorMethod(iterable);
+    if (!iterFn) throw $TypeError(tryToString(iterable) + ' is not iterable');
+    // optimisation for array iterators
+    if (isArrayIteratorMethod(iterFn)) {
+      for (index = 0, length = lengthOfArrayLike(iterable); length > index; index++) {
+        result = callFn(iterable[index]);
+        if (result && isPrototypeOf(ResultPrototype, result)) return result;
+      } return new Result(false);
+    }
+    iterator = getIterator(iterable, iterFn);
+  }
+
+  next = IS_RECORD ? iterable.next : iterator.next;
+  while (!(step = call(next, iterator)).done) {
+    try {
+      result = callFn(step.value);
+    } catch (error) {
+      iteratorClose(iterator, 'throw', error);
+    }
+    if (typeof result == 'object' && result && isPrototypeOf(ResultPrototype, result)) return result;
+  } return new Result(false);
+};