From 156566311b7ab139298ea71e8a4f97c19c1c90cf Mon Sep 17 00:00:00 2001
From: Ryan Cavanaugh <RyanCavanaugh@users.noreply.github.com>
Date: Fri, 8 Mar 2019 16:38:02 -0800
Subject: [PATCH] Rewrite fallback hash to be faster

---
 src/compiler/sys.ts | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/compiler/sys.ts b/src/compiler/sys.ts
index 33283c93803..665c7383139 100644
--- a/src/compiler/sys.ts
+++ b/src/compiler/sys.ts
@@ -8,8 +8,11 @@ namespace ts {
      */
     /* @internal */
     export function generateDjb2Hash(data: string): string {
-        const chars = data.split("").map(str => str.charCodeAt(0));
-        return `${chars.reduce((prev, curr) => ((prev << 5) + prev) + curr, 5381)}`;
+        let acc = 5381;
+        for (let i = 0; i < data.length; i++) {
+            acc = ((acc << 5) + acc) + data.charCodeAt(i);
+        }
+        return acc.toString();
     }
 
     /**