1 files changed, 11 insertions, 12 deletions

diff --git a/ext/fg/js/frontend-api-sender.js b/ext/fg/js/frontend-api-sender.js
index af998a8f..b7c2c57c 100644
--- a/ext/fg/js/frontend-api-sender.js
+++ b/ext/fg/js/frontend-api-sender.js
@@ -22,7 +22,7 @@ class FrontendApiSender {
         this.senderId = FrontendApiSender.generateId(16);
         this.ackTimeout = 3000; // 3 seconds
         this.responseTimeout = 10000; // 10 seconds
-        this.callbacks = {};
+        this.callbacks = new Map();
         this.disconnected = false;
         this.nextId = 0;
 
@@ -43,7 +43,7 @@ class FrontendApiSender {
 
         return new Promise((resolve, reject) => {
             const info = {id, resolve, reject, ack: false, timer: null};
-            this.callbacks[id] = info;
+            this.callbacks.set(id, info);
             info.timer = setTimeout(() => this.onError(id, 'Timeout (ack)'), this.ackTimeout);
 
             this.port.postMessage({id, action, params, target, senderId: this.senderId});
@@ -71,19 +71,18 @@ class FrontendApiSender {
     onDisconnect() {
         this.disconnected = true;
 
-        const ids = Object.keys(this.callbacks);
-        for (const id of ids) {
+        for (const id of this.callbacks.keys()) {
             this.onError(id, 'Disconnected');
         }
     }
 
     onAck(id) {
-        if (!hasOwn(this.callbacks, id)) {
+        const info = this.callbacks.get(id);
+        if (typeof info === 'undefined') {
             console.warn(`ID ${id} not found for ack`);
             return;
         }
 
-        const info = this.callbacks[id];
         if (info.ack) {
             console.warn(`Request ${id} already ack'd`);
             return;
@@ -95,18 +94,18 @@ class FrontendApiSender {
     }
 
     onResult(id, data) {
-        if (!hasOwn(this.callbacks, id)) {
+        const info = this.callbacks.get(id);
+        if (typeof info === 'undefined') {
             console.warn(`ID ${id} not found`);
             return;
         }
 
-        const info = this.callbacks[id];
         if (!info.ack) {
             console.warn(`Request ${id} not ack'd`);
             return;
         }
 
-        delete this.callbacks[id];
+        this.callbacks.delete(id);
         clearTimeout(info.timer);
         info.timer = null;
 
@@ -118,9 +117,9 @@ class FrontendApiSender {
     }
 
     onError(id, reason) {
-        if (!hasOwn(this.callbacks, id)) { return; }
-        const info = this.callbacks[id];
-        delete this.callbacks[id];
+        const info = this.callbacks.get(id);
+        if (typeof info === 'undefined') { return; }
+        this.callbacks.delete(id);
         info.timer = null;
         info.reject(new Error(reason));
     }