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diff --git a/js/public/ErrorInterceptor.h b/js/public/ErrorInterceptor.h
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+++ b/js/public/ErrorInterceptor.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 js_ErrorInterceptor_h
+#define js_ErrorInterceptor_h
+
+#include "jstypes.h"
+
+#include "js/TypeDecls.h"
+
+/**
+ * Callback used to intercept JavaScript errors.
+ */
+struct JSErrorInterceptor {
+  /**
+   * This method is called whenever an error has been raised from JS code.
+   *
+   * This method MUST be infallible.
+   */
+  virtual void interceptError(JSContext* cx, JS::HandleValue error) = 0;
+};
+
+// Set a callback that will be called whenever an error
+// is thrown in this runtime. This is designed as a mechanism
+// for logging errors. Note that the VM makes no attempt to sanitize
+// the contents of the error (so it may contain private data)
+// or to sort out among errors (so it may not be the error you
+// are interested in or for the component in which you are
+// interested).
+//
+// If the callback sets a new error, this new error
+// will replace the original error.
+//
+// May be `nullptr`.
+// This is a no-op if built without NIGHTLY_BUILD.
+extern JS_PUBLIC_API void JS_SetErrorInterceptorCallback(
+    JSRuntime*, JSErrorInterceptor* callback);
+
+// This returns nullptr if built without NIGHTLY_BUILD.
+extern JS_PUBLIC_API JSErrorInterceptor* JS_GetErrorInterceptorCallback(
+    JSRuntime*);
+
+#endif  // js_ErrorInterceptor_h