From 6ff0ba644b1cd4da0fc4ea8e6f6081d574a85823 Mon Sep 17 00:00:00 2001
From: Alexander T <alexander.v.tarasyuk@gmail.com>
Date: Tue, 3 Jul 2018 14:39:58 +0300
Subject: [PATCH] Add new error message - Property {0} is used before its
 initialization.

---
 src/compiler/checker.ts              | 2 +-
 src/compiler/diagnosticMessages.json | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 0c5861ea5ea..d81418e8f94 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -17478,7 +17478,7 @@ namespace ts {
             if (isInPropertyInitializer(node) &&
                 !isBlockScopedNameDeclaredBeforeUse(valueDeclaration, right)
                 && !isPropertyDeclaredInAncestorClass(prop)) {
-                diagnosticMessage = error(right, Diagnostics.Block_scoped_variable_0_used_before_its_declaration, declarationName);
+                diagnosticMessage = error(right, Diagnostics.Property_0_is_used_before_its_initialization, declarationName);
             }
             else if (valueDeclaration.kind === SyntaxKind.ClassDeclaration &&
                 node.parent.kind !== SyntaxKind.TypeReference &&
diff --git a/src/compiler/diagnosticMessages.json b/src/compiler/diagnosticMessages.json
index 540da3826b0..e188bbdc456 100644
--- a/src/compiler/diagnosticMessages.json
+++ b/src/compiler/diagnosticMessages.json
@@ -2401,6 +2401,10 @@
         "category": "Error",
         "code": 2728
     },
+    "Property '{0}' is used before its initialization.": {
+        "category": "Error",
+        "code": 2729
+    },
 
     "Import declaration '{0}' is using private name '{1}'.": {
         "category": "Error",