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1 files changed, 39 insertions, 0 deletions

diff --git a/node_modules/core-js/library/modules/_flatten-into-array.js b/node_modules/core-js/library/modules/_flatten-into-array.js
new file mode 100644
index 00000000..1838517a
--- /dev/null
+++ b/node_modules/core-js/library/modules/_flatten-into-array.js
@@ -0,0 +1,39 @@
+'use strict';
+// https://tc39.github.io/proposal-flatMap/#sec-FlattenIntoArray
+var isArray = require('./_is-array');
+var isObject = require('./_is-object');
+var toLength = require('./_to-length');
+var ctx = require('./_ctx');
+var IS_CONCAT_SPREADABLE = require('./_wks')('isConcatSpreadable');
+
+function flattenIntoArray(target, original, source, sourceLen, start, depth, mapper, thisArg) {
+  var targetIndex = start;
+  var sourceIndex = 0;
+  var mapFn = mapper ? ctx(mapper, thisArg, 3) : false;
+  var element, spreadable;
+
+  while (sourceIndex < sourceLen) {
+    if (sourceIndex in source) {
+      element = mapFn ? mapFn(source[sourceIndex], sourceIndex, original) : source[sourceIndex];
+
+      spreadable = false;
+      if (isObject(element)) {
+        spreadable = element[IS_CONCAT_SPREADABLE];
+        spreadable = spreadable !== undefined ? !!spreadable : isArray(element);
+      }
+
+      if (spreadable && depth > 0) {
+        targetIndex = flattenIntoArray(target, original, element, toLength(element.length), targetIndex, depth - 1) - 1;
+      } else {
+        if (targetIndex >= 0x1fffffffffffff) throw TypeError();
+        target[targetIndex] = element;
+      }
+
+      targetIndex++;
+    }
+    sourceIndex++;
+  }
+  return targetIndex;
+}
+
+module.exports = flattenIntoArray;