Unexpected token: punc (.)

Version: 5.1.0
Node: 15.0.1
Webpack: 5.4.0

In webpack: 
```
  new Dotenv({
      path: path.resolve(__dirname, '../../config', '.env.production'),
    }),
```
This causes error somehow. **Error:**
```
ERROR in server.bundle.js from Terser
Unexpected token: punc (.) [server.bundle.js:3367,6]
```