1 files changed, 55 insertions, 0 deletions
diff --git a/js/loader/ResolveResult.h b/js/loader/ResolveResult.h
new file mode 100644
index 0000000000..e7b415198c
--- /dev/null
+++ b/js/loader/ResolveResult.h
@@ -0,0 +1,55 @@
+/* -*- 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 js_loader_ResolveResult_h
+#define js_loader_ResolveResult_h
+
+#include "mozilla/ResultVariant.h"
+#include "mozilla/NotNull.h"
+#include "nsIURI.h"
+
+namespace JS::loader {
+
+enum class ResolveError : uint8_t {
+  Failure,
+  FailureMayBeBare,
+  BlockedByNullEntry,
+  BlockedByAfterPrefix,
+  BlockedByBacktrackingPrefix,
+  InvalidBareSpecifier,
+  Length
+};
+
+struct ResolveErrorInfo {
+  static const char* GetString(ResolveError aError) {
+    switch (aError) {
+      case ResolveError::Failure:
+        return "ModuleResolveFailureNoWarn";
+      case ResolveError::FailureMayBeBare:
+        return "ModuleResolveFailureWarnRelative";
+      case ResolveError::BlockedByNullEntry:
+        return "ImportMapResolutionBlockedByNullEntry";
+      case ResolveError::BlockedByAfterPrefix:
+        return "ImportMapResolutionBlockedByAfterPrefix";
+      case ResolveError::BlockedByBacktrackingPrefix:
+        return "ImportMapResolutionBlockedByBacktrackingPrefix";
+      case ResolveError::InvalidBareSpecifier:
+        return "ImportMapResolveInvalidBareSpecifierWarnRelative";
+      default:
+        MOZ_CRASH("Unexpected ResolveError value");
+    }
+  }
+};
+
+/**
+ * ResolveResult is used to store the result of 'resolving a module specifier',
+ * which could be an URI on success or a ResolveError on failure.
+ */
+using ResolveResult =
+    mozilla::Result<mozilla::NotNull<nsCOMPtr<nsIURI>>, ResolveError>;
+}  // namespace JS::loader
+
+#endif  // js_loader_ResolveResult_h