how to open browser only when i run webpack-dev-server instead of run webpack?

[webjohnjiang]

i want to open browser when i use webpack-dev-server, but i dont want to open when i run webpack, i dnot know how to set this plugin to run only when i run webpack-dev-server?

[webjohnjiang]

my package.json scripts is below:

"build": "cross-env NODE_ENV=production webpack",
"start": "cross-env NODE_ENV=development webpack-dev-server",