--- /dev/null
+'use strict';
+var $ = require('../internals/export');
+var getOwnPropertyDescriptor = require('../internals/object-get-own-property-descriptor').f;
+var toLength = require('../internals/to-length');
+var notARegExp = require('../internals/not-a-regexp');
+var requireObjectCoercible = require('../internals/require-object-coercible');
+var correctIsRegExpLogic = require('../internals/correct-is-regexp-logic');
+var IS_PURE = require('../internals/is-pure');
+
+var nativeStartsWith = ''.startsWith;
+var min = Math.min;
+
+var CORRECT_IS_REGEXP_LOGIC = correctIsRegExpLogic('startsWith');
+// https://github.com/zloirock/core-js/pull/702
+var MDN_POLYFILL_BUG = !IS_PURE && !CORRECT_IS_REGEXP_LOGIC && !!function () {
+ var descriptor = getOwnPropertyDescriptor(String.prototype, 'startsWith');
+ return descriptor && !descriptor.writable;
+}();
+
+// `String.prototype.startsWith` method
+// https://tc39.es/ecma262/#sec-string.prototype.startswith
+$({ target: 'String', proto: true, forced: !MDN_POLYFILL_BUG && !CORRECT_IS_REGEXP_LOGIC }, {
+ startsWith: function startsWith(searchString /* , position = 0 */) {
+ var that = String(requireObjectCoercible(this));
+ notARegExp(searchString);
+ var index = toLength(min(arguments.length > 1 ? arguments[1] : undefined, that.length));
+ var search = String(searchString);
+ return nativeStartsWith
+ ? nativeStartsWith.call(that, search, index)
+ : that.slice(index, index + search.length) === search;
+ }
+});