diff --git a/language-server/language-server-api/.js/src/main/scala/aqua/lsp/AquaLSP.scala b/language-server/language-server-api/.js/src/main/scala/aqua/lsp/AquaLSP.scala
index 84cea97e..2c1453e5 100644
--- a/language-server/language-server-api/.js/src/main/scala/aqua/lsp/AquaLSP.scala
+++ b/language-server/language-server-api/.js/src/main/scala/aqua/lsp/AquaLSP.scala
@@ -61,7 +61,15 @@ object TokenLocation {
 }
 
 @JSExportAll
-case class ErrorInfo(start: Int, end: Int, message: String, location: UndefOr[String])
+case class ErrorInfo(
+  start: Int,
+  end: Int,
+  message: String,
+  location: UndefOr[String]
+) {
+  // Used to distinguish from WarningInfo in TS
+  val infoType: String = "error"
+}
 
 object ErrorInfo {
 
@@ -77,7 +85,15 @@ object ErrorInfo {
 }
 
 @JSExportAll
-case class WarningInfo(start: Int, end: Int, message: String, location: UndefOr[String])
+case class WarningInfo(
+  start: Int,
+  end: Int,
+  message: String,
+  location: UndefOr[String]
+) {
+  // Used to distinguish from ErrorInfo in TS
+  val infoType: String = "warning"
+}
 
 object WarningInfo {
 
diff --git a/language-server/language-server-npm/aqua-lsp-api.d.ts b/language-server/language-server-npm/aqua-lsp-api.d.ts
index 0f9c0e7c..c59ec827 100644
--- a/language-server/language-server-npm/aqua-lsp-api.d.ts
+++ b/language-server/language-server-npm/aqua-lsp-api.d.ts
@@ -17,6 +17,7 @@ export interface TokenImport {
 }
 
 export interface ErrorInfo {
+    infoType: "error",
     start: number,
     end: number,
     message: string,
@@ -24,6 +25,7 @@ export interface ErrorInfo {
 }
 
 export interface WarningInfo {
+    infoType: "warning",
     start: number,
     end: number,
     message: string,