From b5353bd1b008ecfafe98cd6f0c2b5812b3cce515 Mon Sep 17 00:00:00 2001
From: Manu MA <manu.mtza@gmail.com>
Date: Fri, 15 Nov 2019 17:31:15 +0100
Subject: [PATCH] fix(es5): workaround around es5 helpers name conflict (#2013)

fixes #1916
---
 src/compiler/transpile/transpile-to-es5-worker.ts | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/compiler/transpile/transpile-to-es5-worker.ts b/src/compiler/transpile/transpile-to-es5-worker.ts
index 53237ee24de..4876418835d 100644
--- a/src/compiler/transpile/transpile-to-es5-worker.ts
+++ b/src/compiler/transpile/transpile-to-es5-worker.ts
@@ -35,8 +35,14 @@ export async function transpileToEs5Worker(_cwd: string, input: string, inlineHe
   );
 
   if (results.diagnostics.length === 0) {
-    results.code = tsResults.outputText;
+    results.code = fixHelpers(tsResults.outputText);
   }
 
   return results;
 }
+
+// TODO:
+// remove once fixed: https://github.com/microsoft/TypeScript/issues/35108
+function fixHelpers(code: string) {
+  return code.replace(/\b__(extends|assign|rest|decorate|param|metadata|awaiter|generator|exportStar|values|read|spread|spreadArrays|await|asyncGenerator|asyncDelegator|asyncValues|makeTemplateObject|importStar|importDefault|)_\d\(/g, '__$1(');
+}