From 9475bf7d9e811f0dd05e91f28f321b90a4b3d3a2 Mon Sep 17 00:00:00 2001
From: Andrew Branch <andrew@wheream.io>
Date: Wed, 3 Apr 2019 11:19:23 -0700
Subject: [PATCH] Fall back from globalReadonlyArrayType to globalArrayType
 when transpiling

---
 src/compiler/checker.ts                        | 2 +-
 src/testRunner/unittests/services/transpile.ts | 8 ++++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index b9e5bcaeddf..3eff7a33747 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -30307,7 +30307,7 @@ namespace ts {
                 autoArrayType = createAnonymousType(undefined, emptySymbols, emptyArray, emptyArray, undefined, undefined);
             }
 
-            globalReadonlyArrayType = <GenericType>getGlobalTypeOrUndefined("ReadonlyArray" as __String, /*arity*/ 1);
+            globalReadonlyArrayType = <GenericType>getGlobalTypeOrUndefined("ReadonlyArray" as __String, /*arity*/ 1) || globalArrayType;
             anyReadonlyArrayType = globalReadonlyArrayType ? createTypeFromGenericGlobalType(globalReadonlyArrayType, [anyType]) : anyArrayType;
             globalThisType = <GenericType>getGlobalTypeOrUndefined("ThisType" as __String, /*arity*/ 1);
 
diff --git a/src/testRunner/unittests/services/transpile.ts b/src/testRunner/unittests/services/transpile.ts
index d197d6db621..8429179ffa3 100644
--- a/src/testRunner/unittests/services/transpile.ts
+++ b/src/testRunner/unittests/services/transpile.ts
@@ -445,5 +445,13 @@ var x = 0;`, {
                 }
             }
         });
+
+        transpilesCorrectly("Supports readonly keyword for arrays", "let x: readonly string[];", {
+            options: { compilerOptions: { module: ModuleKind.CommonJS } }
+        });
+
+        transpilesCorrectly("Supports 'as const' arrays", `([] as const).forEach(k => console.log(k));`, {
+            options: { compilerOptions: { module: ModuleKind.CommonJS } }
+        });
     });
 }