code review for https://github.com/uBlockOrigin/uBlock-issues/issues/106

src/js/commands.js

@@ -1,7 +1,7 @@
 /*******************************************************************************
 
     uBlock Origin - a browser extension to block requests.
-    Copyright (C) 2017 Raymond Hill
+    Copyright (C) 2017-present Raymond Hill
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -25,8 +25,15 @@
 
 /******************************************************************************/
 
+µBlock.canUseShortcuts = vAPI.commands instanceof Object;
+
+µBlock.canUpdateShortcuts = µBlock.canUseShortcuts &&
+                            typeof vAPI.commands.update === 'function';
+
+/******************************************************************************/
+
 (function() {
-    if ( vAPI.commands === undefined ) { return; }
+    if ( µBlock.canUseShortcuts === false ) { return; }
 
     vAPI.commands.onCommand.addListener(function(command) {
         var µb = µBlock;

src/js/messaging.js

@@ -917,28 +917,28 @@ var modifyRuleset = function(details) {
 // Shortcuts pane
 
 let getShortcuts = function(callback) {
-    if ( vAPI.commands !== undefined ) {
+    if ( µb.canUseShortcuts === false ) {
-        vAPI.commands.getAll(commands => {
+        return callback([]);
-            let response = [];
-            for ( let command of commands ) {
-                let desc = command.description;
-                let match = /^__MSG_(.+?)__$/.exec(desc);
-                if ( match !== null ) {
-                    desc = vAPI.i18n(match[1]);
-                }
-                if ( desc === '' ) { continue; }
-                command.description = desc;
-                response.push(command);
-            }
-            callback(response);
-        });
-    } else {
-        callback([]);
     }
+
+    vAPI.commands.getAll(commands => {
+        let response = [];
+        for ( let command of commands ) {
+            let desc = command.description;
+            let match = /^__MSG_(.+?)__$/.exec(desc);
+            if ( match !== null ) {
+                desc = vAPI.i18n(match[1]);
+            }
+            if ( desc === '' ) { continue; }
+            command.description = desc;
+            response.push(command);
+        }
+        callback(response);
+    });
 };
 
 let setShortcut = function(details) {
-    if  ( typeof vAPI.commands.update !== 'function' ) { return; }
+    if  ( µb.canUpdateShortcuts === false ) { return; }
     if ( details.shortcut === undefined ) {
         vAPI.commands.reset(details.name);
         µb.commandShortcuts.delete(details.name);
@@ -981,7 +981,7 @@ var onMessage = function(request, sender, callback) {
 
     switch ( request.what ) {
     case 'canUpdateShortcuts':
-        response = typeof vAPI.commands.update === 'function';
+        response = µb.canUpdateShortcuts;
         break;
 
     case 'getRules':

src/js/start.js

@@ -1,7 +1,7 @@
 /*******************************************************************************
 
     uBlock Origin - a browser extension to block requests.
-    Copyright (C) 2014-2018 Raymond Hill
+    Copyright (C) 2014-present Raymond Hill
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -106,12 +106,7 @@ var onPSLReady = function() {
 var onCommandShortcutsReady = function(commandShortcuts) {
     if ( Array.isArray(commandShortcuts) === false ) { return; }
     µb.commandShortcuts = new Map(commandShortcuts);
-    if (
+    if ( µb.canUpdateShortcuts === false ) { return; }
-        vAPI.commands === undefined ||
-        typeof vAPI.commands.update !== 'function'
-    ) {
-        return;
-    }
     for ( let entry of commandShortcuts ) {
         vAPI.commands.update({ name: entry[0], shortcut: entry[1] });
     }