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diff --git a/js/src/builtin/intl/CommonFunctions.h b/js/src/builtin/intl/CommonFunctions.h
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+++ b/js/src/builtin/intl/CommonFunctions.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_CommonFunctions_h
+#define builtin_intl_CommonFunctions_h
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "js/RootingAPI.h"
+#include "js/Utility.h"
+
+namespace mozilla::intl {
+enum class ICUError : uint8_t;
+}
+
+namespace js {
+
+class PropertyName;
+
+namespace intl {
+
+/**
+ * Initialize a new Intl.* object using the named self-hosted function.
+ */
+extern bool InitializeObject(JSContext* cx, JS::Handle<JSObject*> obj,
+                             JS::Handle<PropertyName*> initializer,
+                             JS::Handle<JS::Value> locales,
+                             JS::Handle<JS::Value> options);
+
+enum class DateTimeFormatOptions {
+  Standard,
+  EnableMozExtensions,
+};
+
+/**
+ * Initialize an existing object as an Intl.* object using the named
+ * self-hosted function.  This is only for a few old Intl.* constructors, for
+ * legacy reasons -- new ones should use the function above instead.
+ */
+extern bool LegacyInitializeObject(JSContext* cx, JS::Handle<JSObject*> obj,
+                                   JS::Handle<PropertyName*> initializer,
+                                   JS::Handle<JS::Value> thisValue,
+                                   JS::Handle<JS::Value> locales,
+                                   JS::Handle<JS::Value> options,
+                                   DateTimeFormatOptions dtfOptions,
+                                   JS::MutableHandle<JS::Value> result);
+
+/**
+ * Returns the object holding the internal properties for obj.
+ */
+extern JSObject* GetInternalsObject(JSContext* cx, JS::Handle<JSObject*> obj);
+
+/** Report an Intl internal error not directly tied to a spec step. */
+extern void ReportInternalError(JSContext* cx);
+
+/** Report an Intl internal error not directly tied to a spec step. */
+extern void ReportInternalError(JSContext* cx, mozilla::intl::ICUError error);
+
+/**
+ * The last-ditch locale is used if none of the available locales satisfies a
+ * request. "en-GB" is used based on the assumptions that English is the most
+ * common second language, that both en-GB and en-US are normally available in
+ * an implementation, and that en-GB is more representative of the English used
+ * in other locales.
+ */
+static inline const char* LastDitchLocale() { return "en-GB"; }
+
+/**
+ * Certain old, commonly-used language tags that lack a script, are expected to
+ * nonetheless imply one. This object maps these old-style tags to modern
+ * equivalents.
+ */
+struct OldStyleLanguageTagMapping {
+  const char* const oldStyle;
+  const char* const modernStyle;
+
+  // Provide a constructor to catch missing initializers in the mappings array.
+  constexpr OldStyleLanguageTagMapping(const char* oldStyle,
+                                       const char* modernStyle)
+      : oldStyle(oldStyle), modernStyle(modernStyle) {}
+};
+
+extern const OldStyleLanguageTagMapping oldStyleLanguageTagMappings[5];
+
+extern JS::UniqueChars EncodeLocale(JSContext* cx, JSString* locale);
+
+// The inline capacity we use for a Vector<char16_t>.  Use this to ensure that
+// our uses of ICU string functions, below and elsewhere, will try to fill the
+// buffer's entire inline capacity before growing it and heap-allocating.
+constexpr size_t INITIAL_CHAR_BUFFER_SIZE = 32;
+
+void AddICUCellMemory(JSObject* obj, size_t nbytes);
+
+void RemoveICUCellMemory(JS::GCContext* gcx, JSObject* obj, size_t nbytes);
+}  // namespace intl
+
+}  // namespace js
+
+#endif /* builtin_intl_CommonFunctions_h */