From 49fd1ad80b19aa2ef1110d6f5255ba4fe4efd15f Mon Sep 17 00:00:00 2001
From: Nathan Shively-Sanders <nathansa@microsoft.com>
Date: Thu, 4 May 2017 10:11:25 -0700
Subject: [PATCH] Add JS declaration to index constraint check error reporting

Now Javascript-style declarations like `this.foo = "bar"` are handled
correctly.
---
 src/compiler/checker.ts | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index e1ed2f4fa1f..9649a4b3bdc 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -20233,7 +20233,10 @@ namespace ts {
                 // perform property check if property or indexer is declared in 'type'
                 // this allows to rule out cases when both property and indexer are inherited from the base class
                 let errorNode: Node;
-                if (propDeclaration && (propDeclaration.name.kind === SyntaxKind.ComputedPropertyName || prop.parent === containingType.symbol)) {
+                if (propDeclaration &&
+                    (getSpecialPropertyAssignmentKind(propDeclaration as BinaryExpression) === SpecialPropertyAssignmentKind.ThisProperty ||
+                     propDeclaration.name.kind === SyntaxKind.ComputedPropertyName ||
+                     prop.parent === containingType.symbol)) {
                     errorNode = propDeclaration;
                 }
                 else if (indexDeclaration) {