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diff --git a/js/src/builtin/BigInt.js b/js/src/builtin/BigInt.js
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * Format this BigInt object into a string, using the locale and formatting
+ * options provided.
+ *
+ * Spec PR: https://github.com/tc39/ecma402/pull/236
+ */
+function BigInt_toLocaleString() {
+ // Step 1. Note that valueOf enforces "thisBigIntValue" restrictions.
+ var x = callFunction(std_BigInt_valueOf, this);
+
+ var locales = arguments.length > 0 ? arguments[0] : undefined;
+ var options = arguments.length > 1 ? arguments[1] : undefined;
+
+ // Step 2.
+ var numberFormat;
+ if (locales === undefined && options === undefined) {
+ // This cache only optimizes when no explicit locales and options
+ // arguments were supplied.
+ if (!IsRuntimeDefaultLocale(numberFormatCache.runtimeDefaultLocale)) {
+ numberFormatCache.numberFormat = intl_NumberFormat(locales, options);
+ numberFormatCache.runtimeDefaultLocale = RuntimeDefaultLocale();
+ }
+ numberFormat = numberFormatCache.numberFormat;
+ } else {
+ numberFormat = intl_NumberFormat(locales, options);
+ }
+
+ // Step 3.
+ return intl_FormatNumber(numberFormat, x, /* formatToParts = */ false);
+}