import pls work

webpack.prod.js

@@ -8,7 +8,8 @@ module.exports = {
     entry: path.resolve(__dirname, 'hdkey.js'),
     output: {
         path: path.resolve(__dirname, '.'),
+        libraryTarget: 'umd',
+        globalObject: 'this',
         filename: 'hdkey.min.js',
     },
-
-  }
+}