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'use strict';
var $ = require('../internals/export');
var uncurryThis = require('../internals/function-uncurry-this');
var requireObjectCoercible = require('../internals/require-object-coercible');
var toIntegerOrInfinity = require('../internals/to-integer-or-infinity');
var toString = require('../internals/to-string');
var fails = require('../internals/fails');

var charAt = uncurryThis(''.charAt);

var FORCED = fails(function () {
  // eslint-disable-next-line es-x/no-array-string-prototype-at -- safe
  return '𠮷'.at(-2) !== '\uD842';
});

// `String.prototype.at` method
// https://github.com/tc39/proposal-relative-indexing-method
$({ target: 'String', proto: true, forced: FORCED }, {
  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);
  }
});