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node_modules/core-js/internals/array-copy-within.js

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+'use strict';
+var toObject = require('../internals/to-object');
+var toAbsoluteIndex = require('../internals/to-absolute-index');
+var lengthOfArrayLike = require('../internals/length-of-array-like');
+var deletePropertyOrThrow = require('../internals/delete-property-or-throw');
+
+var min = Math.min;
+
+// `Array.prototype.copyWithin` method implementation
+// https://tc39.es/ecma262/#sec-array.prototype.copywithin
+// eslint-disable-next-line es/no-array-prototype-copywithin -- safe
+module.exports = [].copyWithin || function copyWithin(target /* = 0 */, start /* = 0, end = @length */) {
+  var O = toObject(this);
+  var len = lengthOfArrayLike(O);
+  var to = toAbsoluteIndex(target, len);
+  var from = toAbsoluteIndex(start, len);
+  var end = arguments.length > 2 ? arguments[2] : undefined;
+  var count = min((end === undefined ? len : toAbsoluteIndex(end, len)) - from, len - to);
+  var inc = 1;
+  if (from < to && to < from + count) {
+    inc = -1;
+    from += count - 1;
+    to += count - 1;
+  }
+  while (count-- > 0) {
+    if (from in O) O[to] = O[from];
+    else deletePropertyOrThrow(O, to);
+    to += inc;
+    from += inc;
+  } return O;
+};