Change the way modules are excluded from webpack

package.json

@@ -52,6 +52,10 @@
     "node": ">=6.0.0"
   },
   "browser": {
+    "ws": false,
+    "opusscript": false,
+    "node-opus": false,
+    "tweet-nacl": false,
     "src/sharding/Shard.js": false,
     "src/sharding/ShardClientUtil.js": false,
     "src/sharding/ShardingManager.js": false,

webpack.config.js

@@ -28,12 +28,6 @@ const createConfig = (options) => {
         { test: /\.md$/, loader: 'ignore-loader' },
       ],
     },
-    externals: {
-      ws: { commonjs: 'ws' },
-      opusscript: { commonjs: 'opusscript' },
-      'node-opus': { commonjs: 'node-opus' },
-      'tweet-nacl': { commonjs: 'tweet-nacl' },
-    },
     node: {
       fs: 'empty',
       dns: 'mock',