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diff --git a/src/error.h b/src/error.h
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+++ b/src/error.h
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+/*
+ * Copyright 2018 WebAssembly Community Group participants
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef WABT_ERROR_H_
+#define WABT_ERROR_H_
+
+#include <string>
+#include <vector>
+
+#include "src/common.h"
+#include "src/string-view.h"
+
+namespace wabt {
+
+enum class ErrorLevel {
+  Warning,
+  Error,
+};
+
+static WABT_INLINE const char* GetErrorLevelName(ErrorLevel error_level) {
+  switch (error_level) {
+    case ErrorLevel::Warning:
+      return "warning";
+    case ErrorLevel::Error:
+      return "error";
+  }
+  WABT_UNREACHABLE;
+}
+
+class Error {
+ public:
+  Error(ErrorLevel error_level, Location loc, string_view message)
+      : error_level(error_level), loc(loc), message(message.to_string()) {}
+
+  ErrorLevel error_level;
+  Location loc;
+  std::string message;
+};
+
+using Errors = std::vector<Error>;
+
+}  // namespace wabt
+
+#endif  //  WABT_ERROR_H_