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diff --git a/js/src/builtin/intl/IntlObject.h b/js/src/builtin/intl/IntlObject.h
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+++ b/js/src/builtin/intl/IntlObject.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * 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/. */
+
+#ifndef builtin_intl_IntlObject_h
+#define builtin_intl_IntlObject_h
+
+#include "js/TypeDecls.h"
+
+namespace js {
+
+extern const JSClass IntlClass;
+
+/**
+ * Returns a plain object with calendar information for a single valid locale
+ * (callers must perform this validation).  The object will have these
+ * properties:
+ *
+ *   firstDayOfWeek
+ *     an integer in the range 1=Monday to 7=Sunday indicating the day
+ *     considered the first day of the week in calendars, e.g. 7 for en-US,
+ *     1 for en-GB, 7 for bn-IN
+ *   minDays
+ *     an integer in the range of 1 to 7 indicating the minimum number
+ *     of days required in the first week of the year, e.g. 1 for en-US,
+ *     4 for de
+ *   weekend
+ *     an array with values in the range 1=Monday to 7=Sunday indicating the
+ *     days of the week considered as part of the weekend, e.g. [6, 7] for en-US
+ *     and en-GB, [7] for bn-IN (note that "weekend" is *not* necessarily two
+ *     days)
+ *
+ * NOTE: "calendar" and "locale" properties are *not* added to the object.
+ */
+[[nodiscard]] extern bool intl_GetCalendarInfo(JSContext* cx, unsigned argc,
+                                               JS::Value* vp);
+
+/**
+ * Compares a BCP 47 language tag against the locales in availableLocales and
+ * returns the best available match -- or |undefined| if no match was found.
+ * Uses the fallback mechanism of RFC 4647, section 3.4.
+ *
+ * The set of available locales consulted doesn't necessarily include the
+ * default locale or any generalized forms of it (e.g. "de" is a more-general
+ * form of "de-CH"). If you want to be sure to consider the default local and
+ * its generalized forms (you usually will), pass the default locale as the
+ * value of |defaultOrNull|; otherwise pass null.
+ *
+ * Spec: ECMAScript Internationalization API Specification, 9.2.2.
+ * Spec: RFC 4647, section 3.4.
+ *
+ * Usage: result = intl_BestAvailableLocale("Collator", locale, defaultOrNull)
+ */
+[[nodiscard]] extern bool intl_BestAvailableLocale(JSContext* cx, unsigned argc,
+                                                   JS::Value* vp);
+
+/**
+ * Return the supported locale for the input locale if ICU supports that locale
+ * (perhaps via fallback, e.g. supporting "de-CH" through "de" support implied
+ * by a "de-DE" locale). Otherwise uses the last-ditch locale.
+ *
+ * Usage: result = intl_supportedLocaleOrFallback(locale)
+ */
+[[nodiscard]] extern bool intl_supportedLocaleOrFallback(JSContext* cx,
+                                                         unsigned argc,
+                                                         JS::Value* vp);
+
+/**
+ * Returns the list of supported values for the given key. Throws a RangeError
+ * if the key isn't one of {"calendar", "collation", "currency",
+ * "numberingSystem", "timeZone", "unit"}.
+ *
+ * Usage: list = intl_SupportedValuesOf(key)
+ */
+[[nodiscard]] extern bool intl_SupportedValuesOf(JSContext* cx, unsigned argc,
+                                                 JS::Value* vp);
+
+}  // namespace js
+
+#endif /* builtin_intl_IntlObject_h */