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node_modules/core-js/modules/esnext.string.at.js

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+'use strict';
+// TODO: Remove from `core-js@4`
+var $ = require('../internals/export');
+var charAt = require('../internals/string-multibyte').charAt;
+var requireObjectCoercible = require('../internals/require-object-coercible');
+var toIntegerOrInfinity = require('../internals/to-integer-or-infinity');
+var toString = require('../internals/to-string');
+
+// `String.prototype.at` method
+// https://github.com/mathiasbynens/String.prototype.at
+$({ target: 'String', proto: true, forced: true }, {
+  at: function at(index) {
+    var S = toString(requireObjectCoercible(this));
+    var len = S.length;
+    var relativeIndex = toIntegerOrInfinity(index);
+    var k = relativeIndex >= 0 ? relativeIndex : len + relativeIndex;
+    return (k < 0 || k >= len) ? undefined : charAt(S, k);
+  }
+});