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diff --git a/js/src/vm/ErrorReporting.h b/js/src/vm/ErrorReporting.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ * 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 vm_ErrorReporting_h
+#define vm_ErrorReporting_h
+
+#include "mozilla/Move.h"
+
+#include <stdarg.h>
+
+#include "jsapi.h" // for JSErrorNotes, JSErrorReport
+
+#include "js/UniquePtr.h" // for UniquePtr
+#include "js/Utility.h" // for UniqueTwoByteChars
+
+struct JSContext;
+
+namespace js {
+
+/**
+ * Metadata for a compilation error (or warning) at a particular offset, or at
+ * no offset (i.e. with respect to a script overall).
+ */
+struct ErrorMetadata
+{
+    // The file/URL where the error occurred.
+    const char* filename;
+
+    // The line and column numbers where the error occurred.  If the error
+    // is with respect to the entire script and not with respect to a
+    // particular location, these will both be zero.
+    uint32_t lineNumber;
+    uint32_t columnNumber;
+
+    // If the error occurs at a particular location, context surrounding the
+    // location of the error: the line that contained the error, or a small
+    // portion of it if the line is long.
+    //
+    // This information is provided on a best-effort basis: code populating
+    // ErrorMetadata instances isn't obligated to supply this.
+    JS::UniqueTwoByteChars lineOfContext;
+
+    // If |lineOfContext| is non-null, its length.
+    size_t lineLength;
+
+    // If |lineOfContext| is non-null, the offset within it of the token that
+    // triggered the error.
+    size_t tokenOffset;
+
+    // Whether the error is "muted" because it derives from a cross-origin
+    // load.  See the comment in TransitiveCompileOptions in jsapi.h for
+    // details.
+    bool isMuted;
+};
+
+class CompileError : public JSErrorReport
+{
+  public:
+    void throwError(JSContext* cx);
+};
+
+/** Send a JSErrorReport to the warningReporter callback. */
+extern void
+CallWarningReporter(JSContext* cx, JSErrorReport* report);
+
+/**
+ * Report a compile error during script processing prior to execution of the
+ * script.
+ */
+extern void
+ReportCompileError(ErrorMetadata&& metadata, UniquePtr<JSErrorNotes> notes,
+                   unsigned flags, unsigned errorNumber, va_list args);
+
+/**
+ * Report a compile warning during script processing prior to execution of the
+ * script.  Returns true if the warning was successfully reported, false if an
+ * error occurred.
+ *
+ * This function DOES NOT respect an existing werror option.  If the caller
+ * wishes such option to be respected, it must do so itself.
+ */
+extern MOZ_MUST_USE bool
+ReportCompileWarning(JSContext* cx, ErrorMetadata&& metadata, UniquePtr<JSErrorNotes> notes,
+                     unsigned flags, unsigned errorNumber, va_list args);
+
+} // namespace js
+
+#endif /* vm_ErrorReporting_h */