harryli8725

try to add this configuration in your webpack.config file `configure: (webpackConfig, { env, paths }) => { webpackConfig.module.rules.push({ test: /node_modules\/@stomp\/stompjs\/.*\.js$/, use: { loader: 'babel-loader', options: { presets: ['@babel/preset-env'], plugins: ['@babel/plugin-proposal-optional-chaining'],...