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diff --git a/js/public/Warnings.h b/js/public/Warnings.h
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+++ b/js/public/Warnings.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/. */
+
+/*
+ * Functionality for issuing and handling warnings.
+ *
+ * Warnings are situations that aren't inherently full-blown errors (and perhaps
+ * for spec compliance *can't* be), but that may represent dubious programming
+ * practice that embeddings may wish to know about.
+ *
+ * SpiderMonkey recognizes an unspecified set of syntactic patterns and runtime
+ * behaviors as triggering a warning.  Embeddings may also recognize and report
+ * additional warnings.
+ */
+
+#ifndef js_Warnings_h
+#define js_Warnings_h
+
+#include "mozilla/Assertions.h"  // MOZ_ASSERT
+#include "mozilla/Attributes.h"  // MOZ_FORMAT_PRINTF, MOZ_RAII
+
+#include "jstypes.h"  // JS_PUBLIC_API
+
+struct JS_PUBLIC_API JSContext;
+class JSErrorReport;
+
+namespace JS {
+
+/**
+ * Report a warning represented by the sprintf-like conversion of ASCII format
+ * filled from trailing ASCII arguments.
+ *
+ * Return true iff the warning was successfully reported without reporting an
+ * error (or being upgraded into one).
+ */
+extern JS_PUBLIC_API bool WarnASCII(JSContext* cx, const char* format, ...)
+    MOZ_FORMAT_PRINTF(2, 3);
+
+/**
+ * Report a warning represented by the sprintf-like conversion of Latin-1 format
+ * filled from trailing Latin-1 arguments.
+ *
+ * Return true iff the warning was successfully reported without reporting an
+ * error (or being upgraded into one).
+ */
+extern JS_PUBLIC_API bool WarnLatin1(JSContext* cx, const char* format, ...)
+    MOZ_FORMAT_PRINTF(2, 3);
+
+/**
+ * Report a warning represented by the sprintf-like conversion of UTF-8 format
+ * filled from trailing UTF-8 arguments.
+ *
+ * Return true iff the warning was successfully reported without reporting an
+ * error (or being upgraded into one).
+ */
+extern JS_PUBLIC_API bool WarnUTF8(JSContext* cx, const char* format, ...)
+    MOZ_FORMAT_PRINTF(2, 3);
+
+using WarningReporter = void (*)(JSContext* cx, JSErrorReport* report);
+
+extern JS_PUBLIC_API WarningReporter GetWarningReporter(JSContext* cx);
+
+extern JS_PUBLIC_API WarningReporter
+SetWarningReporter(JSContext* cx, WarningReporter reporter);
+
+/**
+ * A simple RAII class that clears the registered warning reporter on
+ * construction and restores it on destruction.
+ *
+ * A fresh warning reporter *may* be set while an instance of this class is
+ * live, but it must be unset in LIFO fashion by the time that instance is
+ * destroyed.
+ */
+class MOZ_RAII JS_PUBLIC_API AutoSuppressWarningReporter {
+  JSContext* context_;
+  WarningReporter prevReporter_;
+
+ public:
+  explicit AutoSuppressWarningReporter(JSContext* cx) : context_(cx) {
+    prevReporter_ = SetWarningReporter(context_, nullptr);
+  }
+
+  ~AutoSuppressWarningReporter() {
+#ifdef DEBUG
+    WarningReporter reporter =
+#endif
+        SetWarningReporter(context_, prevReporter_);
+    MOZ_ASSERT(reporter == nullptr, "Unexpected WarningReporter active");
+    SetWarningReporter(context_, prevReporter_);
+  }
+};
+
+}  // namespace JS
+
+#endif  // js_Warnings_h