From d88406a31bcd8fdf0b57b078f322d3cf6c62333d Mon Sep 17 00:00:00 2001
From: Yulong Wang <7679871+fs-eire@users.noreply.github.com>
Date: Tue, 5 Sep 2023 23:14:46 -0700
Subject: [PATCH] [js/common] use Map instead of object for backends (#17352)

### Description
resolved
https://github.com/microsoft/onnxruntime/security/code-scanning/1140
---
 js/common/lib/backend-impl.ts | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/js/common/lib/backend-impl.ts b/js/common/lib/backend-impl.ts
index 57488e1642..75feba1d0a 100644
--- a/js/common/lib/backend-impl.ts
+++ b/js/common/lib/backend-impl.ts
@@ -12,7 +12,7 @@ interface BackendInfo {
   aborted?: boolean;
 }
 
-const backends: {[name: string]: BackendInfo} = {};
+const backends: Map<string, BackendInfo> = new Map();
 const backendsSortedByPriority: string[] = [];
 
 /**
@@ -27,9 +27,9 @@ const backendsSortedByPriority: string[] = [];
  */
 export const registerBackend = (name: string, backend: Backend, priority: number): void => {
   if (backend && typeof backend.init === 'function' && typeof backend.createSessionHandler === 'function') {
-    const currentBackend = backends[name];
+    const currentBackend = backends.get(name);
     if (currentBackend === undefined) {
-      backends[name] = {backend, priority};
+      backends.set(name, {backend, priority});
     } else if (currentBackend.priority > priority) {
       // same name is already registered with a higher priority. skip registeration.
       return;
@@ -46,7 +46,7 @@ export const registerBackend = (name: string, backend: Backend, priority: number
       }
 
       for (let i = 0; i < backendsSortedByPriority.length; i++) {
-        if (backends[backendsSortedByPriority[i]].priority <= priority) {
+        if (backends.get(backendsSortedByPriority[i])!.priority <= priority) {
           backendsSortedByPriority.splice(i, 0, name);
           return;
         }
@@ -71,7 +71,7 @@ export const resolveBackend = async(backendHints: readonly string[]): Promise<Ba
   const backendNames = backendHints.length === 0 ? backendsSortedByPriority : backendHints;
   const errors = [];
   for (const backendName of backendNames) {
-    const backendInfo = backends[backendName];
+    const backendInfo = backends.get(backendName);
     if (backendInfo) {
       if (backendInfo.initialized) {
         return backendInfo.backend;