From ff42c3d198c04cd17da4f2996e2dacbce6a5bc00 Mon Sep 17 00:00:00 2001
From: Anders Hejlsberg <andersh@microsoft.com>
Date: Mon, 28 Jan 2019 16:09:55 -0800
Subject: [PATCH] Handle readonly arrays and tuples in decorator metadata
 serialization

---
 src/compiler/transformers/ts.ts | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/compiler/transformers/ts.ts b/src/compiler/transformers/ts.ts
index 7aebed59588..e540a40bcec 100644
--- a/src/compiler/transformers/ts.ts
+++ b/src/compiler/transformers/ts.ts
@@ -1934,6 +1934,12 @@ namespace ts {
                 case SyntaxKind.ConditionalType:
                     return serializeTypeList([(<ConditionalTypeNode>node).trueType, (<ConditionalTypeNode>node).falseType]);
 
+                case SyntaxKind.TypeOperator:
+                    if ((<TypeOperatorNode>node).operator === SyntaxKind.ReadonlyKeyword) {
+                        return serializeTypeNode((<TypeOperatorNode>node).type);
+                    }
+                    break;
+
                 case SyntaxKind.TypeQuery:
                 case SyntaxKind.TypeOperator:
                 case SyntaxKind.IndexedAccessType: