How to set app icon for Electron / Atom Shell App -

how set app icon electron app?

i trying browserwindow({icon:'path/to/image.png'}); not work.

do need pack app see effect?

setting icon property when creating browserwindow has effect on windows , linux.

to set icon on os x, can use electron-packager , set icon using --icon switch.

it need in .icns format os x. there online icon converter can create file .png.