Webpack example

Adding external tool in Phpstorm:

File - Settings - Tools - External Tools - +

Set the name:

Webpack dev server

Tool settings:

Program: C:\Users\[userName]\AppData\Roaming\npm\webpack-dev-server.cmd
Parameters: --content-base [destinationFolder] 
 Example: --content-base dist
Working directory: $ProjectFileDir$

Adding keymap:

File - Settings - Keymap - External Tools - External Tools - Webpack dev server - Add shortcut -> Press "ALT + D"