swagger-editor gives Uncaught TypeError: SwaggerEditorBundle is not a function at window.onload

I am trying to use the swagger-editor repo https://github.com/swagger-api/swagger-editor in my local system(windows).When i run npm start command things are working fine but as soon as i make a minor chnage in the components like changing clear editor text to clear editor1 and trying to build the files again using npm run build it is giving the error Uncaught TypeError: SwaggerEditorBundle is not a function at window.onload when I am accessing it using localhost:3001. 

Even if I dont make any change and run the command npm run dev , same issue is occuring, can someone please help in figuring out the resolution for this and how we can do the same if we have to change something?