update auto-build script

build/webpack.js

@@ -1,4 +1,5 @@
 /* eslint-disable import/no-extraneous-dependencies */
+const path = require('path');
 const webpack = require('webpack');
 const FriendlyErrorsPlugin = require('friendly-errors-webpack-plugin');
 const { root } = require('./utils');
@@ -20,6 +21,9 @@ const build = async (type) => {
             new FriendlyErrorsPlugin({
                 clearConsole: false,
             }),
+            new webpack.ProvidePlugin({
+                saslprep: path.resolve(__dirname, 'node_modules/saslprep/index.js'),
+            }),
         ],
     };
     const compiler = webpack(config);